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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences BULETIN OSEANOGRAFI MARINA Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Journal of Marine Research Jurnal Kelautan Tropis Indonesian Journal of Mollusk
Sri Redjeki
Department Of Marine Science, Faculty Of Fisheries And Marine Science, Diponegoro University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Education Environmental Science

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Inventarisasi Jenis Lamun Di Perairan Pulau Nyamuk Kepulauan Karimunjawa, Jawa Tengah Bagas Santosa; Sri Redjeki; Raden Ario
Journal of Marine Research Vol 12, No 1 (2023): Journal of Marine Research
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jmr.v12i1.34326

Abstract

Pulau Nyamuk ialah pulau dengan keanekaragaman hayati salah satunya adalah ekosistem lamun. Pentingnya peran ekosistem lamun pada perairan laut menimbulkan pertanyaan mengenai kondisi padang lamun di Pulau Nyamuk Karimunjawa. Hal ini diperlukannya penambahan informasi mengenai kondisi ekosistem lamun di kawasan Pulau Nyamuk, menyebabkan perlunya pembaruan informasi lamun. Tujuan penelitian untuk mengetahui spesies lamun dan struktur komunitas. Metode yang digunakan dalam menentukan lokasi sampling yaitu purposive sampling. Metode pengambilan data mengacu pada metode line transek menggunakan transek kuadran ukuran 50x50cm dengan jarak 50 meter antara line dengan panjang line transek 100 meter tegak lurus dari garis pantai ke arah laut. Hasil penelitian menunjukan jenis lamun yang dijumpai teridentifikasi sebanyak 4 spesies, kerapatan yang jarang, dengan tutupan yang tergolong kurang sehat. nilai frekuensi kelas A (0-20) dan Indeks Nilai Penting tertinggi pada jenis E. acoroides, dengan demikian jenis tersebut memiliki peranan paling penting dalam komunitas perairan di Pulau Nyamuk. Nyamuk Island is an island with biodiversity, one of which is the seagrass ecosystem. The importance of the role of seagrass ecosystems in marine waters raises questions about the condition of seagrass beds on Nyamuk Island, Karimunjawa. This requires additional information regarding the condition of the seagrass ecosystem in the Nyamuk Island area, causing the need for updating seagrass information. The study aims to determine seagrass species and community structure. Purposive sampling method is used in this research. The data collection method refers to the line transect method using a quadrant transect measuring 50x50cm with a distance of 50 meters between lines and a transect line length of 100 meters perpendicular from the shoreline to the sea. The results showed that the types of seagrasses found were identified as many as 4 species, rare density, and the cover was classified as unhealthy. the frequency value of class A (0-20) and the Important Value Index for the E. acoroides species, thus this species has the most important role in the aquatic community on Nyamuk Island.
The Composition of Portunus pelagicus on the Fishing Ground Area of Danasari Waters, Pemalang Regency Sri Redjeki; Ria Azizah Tri Nuraini; Hadi Endrawati
Jurnal Kelautan Tropis Vol 26, No 2 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/potensi.%Y.18825

Abstract

Blue swimming crab (Portunus pelagicus) is one of the most economically valuable marine products in Indonesia. The crabs productivity was generally still dependent on the population in the wild. Danasari Village is one of the main crab producers in Pemalang Regency. The daily fishing crab activities by fisherman direct an impact on decreasing of the natural crabs resources. This study determined the crabs composition in the fishing ground where usually spotted by the Danasari crab fisherman. This research obtained the information of a composition of female and male crabs, carapace width distribution, growth characterized, and the egg-berried female number. This study conducted on May to July 2022. The result in this research was a male crabs were dominated than females. The carapace width was generally amount 92-112 mm, while the growth characteristic of blue swimming crabs was negative allometric. The female crab gonad maturity was dominated by 2nd level gonad maturity, while the egg-berried female crabs were found 21 crabs totaled from 14 spot fishing grounds. Based on the carapace width distribution, there are a lot of blue swimming crab with undersized in shallow-depth fishing sites, while the crab size mostly above 100 mm already found at each spot in this research. The highest egg-berried female percentage was found at spot 7th and 13rd, where the female crabs at 7th spot were bigger carapace than at 13rd spot areas. These results indicated that crab resources in Danasari Waters and surround area were indicated potentially overfished, proven with undersized berried-female crabs. The management efforts will conduct an environmentally friendly fishing gear, regarding the policy of ministry regulating as to keep crab resources sustainable. In addition, scheduling rules for fishing activities can also be tested to be applied.
Vegetation Analysis as Indicator of Mangrove Degradation Level in Keboromo Village, Tayu M. Amanun Tharieq; Azis Nur Bambang; Lita Tyesta Addy Listya Wardhani; Sri Redjeki; Rudhi Pribadi
Jurnal Kelautan Tropis Vol 26, No 2 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i2.17575

Abstract

Mangrove degradation is one of the most common issues in the coastal areas of Java, which can cause ecological impacts and even disadvantage for local community. The mangrove forest degradation can be identified based on the vegetation analysis results, which could potentially contribute to the mangrove ecosystem management and rehabilitation programs in the coastal areas. Mangroves in Keboromo Village was the rehabilitation and cultivation area, but often get damaged by ocean waves. This study aims to determine the ecological and vegetation conditions of mangrove ecosystems consist of species composition, density, canopy cover, tree height, and environmental parameters were held in February 2023. The method used was direct observation using transect quadrants of 10x10 m2. The average mangrove density of all observation stations was 3.425 individuals/ha for the tree category, 575 individuals/ha for the sapling category, and 250 individuals/ha for the seedling category. The average percentage of canopy cover was 78.41%. The average height of mangrove trees at all stations is 4.15 m. The environmental parameters were still compatible with the water quality standard for biota and mangrove life. The mangrove forest degradation level based on standard criteria and guidelines for determining mangrove degradation is categorized as low, indicated by mangrove density >1500 individuals/ha and canopy cover >75%. Poor conditions were measured for sapling and seedling densities, which may be caused by environmental factors unsupportive for mangrove regeneration. Based on the results of mangrove vegetation analysis in Keboromo Village, it can state the mangrove ecosystem condition is good. However, management programs are needed to keep the mangroves sustainable.
Kajian Komposisi Ukuran Rajungan Betina (Portunus pelagicus) di Fishing Ground Perairan Pemalang Ria Azizah Tri Nuraini; Sri Redjeki; Hadi Endrawati; M. Amanun Tharieq
Buletin Oseanografi Marina Vol 12, No 3 (2023): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v12i3.51276

Abstract

Rajungan betina memiliki peranan penting dalam keberlanjutan stok sumber daya rajungan di alam. Maraknya rajungan betina yang masih ditangkap oleh nelayan menjadi salah satu ancaman besar terhadap keberlanjutan sumber daya rajungan. Tujuan penelitian ini untuk mengetahui komposisi rajungan betina berdasarkan kelas lebar karapas, hubungan lebar karapas dan berat tubuh, komposisi tingkat kematangan gonad (TKG), nilai fekunditas dan persentase egg berried female (EBF) pada 20 titik area fishing ground yang dilaksanakan selama bulan Mei – Agustus 2022 di perairan Pemalang. Pengambilan sampel dan penentuan titik fishing ground dilakukan secara purposive sampling dengan menyesuaikan area penangkapan nelayan rajungan Desa Danasari, Pemalang. Distribusi ukuran lebar karapas rajungan menunjukkan modus kelas lebar karapas pada 101 – 110 mm, dimana kondisi tersebut tergolong kurang baik mengingat ukuran minimum rajungan yang boleh ditangkap adalah >100 mm. Hubungan lebar karapas dan berat tubuh menunjukkan pertumbuhan rajungan betina bersifat allometrik negatif, yang berarti pertambahan lebar karapas lebih cepat dibandingkan pertambahan berat tubuh. Komposisi TKG rajungan betina didominasi pada kondisi kematangan tingkat 2 (TKG 2) dengan persentase 78%. Nilai fekunditas rajungan betina bertelur dengan rata-rata pada kisaran 301.202±131.949 butir telur. Nilai EBF tertinggi ditemukan pada titik 12 dengan persentase 1,09% dengan rajungan betina bertelur sebanyak 7 ekor. Keberadaan rajungan betina di perairan menjadi salah satu faktor kunci keberlanjutan sumber daya rajungan, sehingga diharapkan dapat dijadikan acuan dalam penentuan area perlindungan dan kawasan potensial reproduksi rajungan di perairan Pemalang dan perairan lainnya. Female blue swimming crabs have an important role in the sustainability of crab populations of natural resources. The large number of female crabs that are still caught by fishermen is one of the major threats to the sustainability of crab resources. The purpose of this study was to determine the composition of female crab based on carapace width class, carapace width and body weight relationship, composition of gonad maturity level (TKG), fecundity value and percentage of egg berried female (EBF) at 20 spots of fishing ground area during May - August 2022 in Pemalang waters. Sampling and selection of fishing ground points were carried out by purposive sampling by adjusting the fishing area of crab fishermen in Danasari Village, Pemalang Regency. The distribution of carapace width size of crab showed the mode of carapace width class at 101 - 110 mm, where the condition is not quite good considering the minimum size of crab that can be caught is >100 mm. The relationship between carapace width and body weight shows that the growth of female crabs is negative allometric, which means that the increase in carapace width is faster than the increase in body weight. The TKG composition of female crabs is dominated by the condition of 2nd maturity level (TKG 2) with a percentage of 78%. The fecundity value of egg laying female crabs with an average in the range of 301,202±131,949 eggs. The highest EBF value was found at spot 12 with a percentage of 1,09%, with the number of egg berried female crabs are 7 individuals. The presence of female crabs in the waters is one of the key factors for the sustainability of crab resources, so it is expected to be used as a reference in determining protection and potential reproduction areas of blue swimming crabs in Pemalang waters and other waters.
Struktur Komunitas Mangrove di Ekosistem Hutan Mangrove Kecamatan Tayu, Kabupaten Pati Rachellia Rose Nugraha; Sunaryo Sunaryo; Sri Redjeki
Journal of Marine Research Vol 12, No 3 (2023): Journal of Marine Research
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jmr.v12i3.36227

Abstract

Ekosistem mangrove dapat dimanfaatkan oleh beberapa biota sebagai tempat untuk mencari makan, sebagai tempat memijah dan area asuhan. Kondisi ekosistem mangrove dapat mengalami penurunan salah satunya karena alih fungsi hutan mangrove. Hal ini akan berdampak buruk terhadap perekonomian nelayan, petambak dan masyarakat lainnya pada daerah tersebut. Penelitian ini perlu dilakukan dengan tujuan untuk menganalisis struktur komunitas mangrove yang ada di ekosistem hutan mangrove Kecamatan Tayu, Kabupaten Pati. Penelitian ini menggunakan metode survei dengan teknik purposive sampling untuk penentuan lokasinya. Terdapat 4 stasiun dan setiap stasiun terdiri dari 3 plot, masing-masing plot berukuran 10m x 10m untuk tingkat pohon dan 5 x 5 m untuk anakan. Pengolahan data struktur komunitas mangrove dilakukan dengan menggunakan perangkat lunak berupa Microsoft Excel. Terdapat dua jenis mangrove yang ditemukan pada penelitian ini yaitu Avicennia marina dan Avicennia alba. Kerapatan mangrove di lokasi penelitian tergolong sangat rapat. Berdasarkan nilai frekuensinya jenis Avicennia marina selalu ditemukan pada setiap plot pengamatan. Hasil indeks dominansi menyatakan bahwa pada Stasiun I hingga Stasiun IV terdapat jenis yang mendominasi dengan kisaran nilai sebesar 0,7 – 0,78. INP paling tinggi ada pada jenis Avicennia marina dengan nilai sebesar 260% dan tergolong tinggi. Hasil nilai indeks keanekaragaman menyatakan bahwa keanekaragaman mangrove pada lokasi penelitian ini tergolong rendah. Sedangkan nilai indeks keseragamannya termasuk dalam kategori sedang dan kurang. Secara umum parameter kualitas perairan (suhu, pH, salinitas, substrat dan kandungan nitrat, fosfat substrat) dinyatakan sesuai dan baik untuk kehidupan mangrove. Mangrove ecosystems can be used by some biota as a feeding, spawning and nursery ground. The condition of the mangrove ecosystem can experience a decline, one of which is due to the conversion of mangrove forests. This will adversely affect the economy of fishermen, farmers and other communities in the area. This study needs to be done with the aim to analyze the structure of mangrove communities in the mangrove forest ecosystem in Tayu District, Pati Regency. This research used a survey method with purposive sampling technique to determine the location. There were 4 stations and each station consisted of 3 plots, each plot measuring 10 x 10m for tree level and 5 x 5m for saplings. Mangrove community structure data processing was done by using software such as Microsoft Excel. There were two types of mangroves found in this study, namely Avicennia marina and Avicennia alba. The density of mangroves at the research site was classified as very tight. Based on the frequency value, the type of Avicennia marina was always found in each observation plot. The results of the dominance index states that at Station I to station IV there were types that dominate with a range of values of 0.7 to 0.78. The highest INP value was in the type of Avicennia marina with a value of 260% and was classified as high. The results of the diversity index value states that the diversity of mangroves at this research location is relatively low. While the value of the uniformity index was included in the category of medium and less. In general, water quality parameters (temperature, pH, salinity, substrate and nitrate phosphate content in the substrate) were stated to be suitable and good for mangrove life. 
Komposisi Hasil Tangkapan Utama Rajungan dan Tangkapan Samping Nelayan Desa Danasari, Pemalang Hadi Endrawati; Sri Redjeki; Ria Azizah Tri Nuraini; M. Amanun Tharieq
Jurnal Kelautan Tropis Vol 26, No 3 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i3.20141

Abstract

Crab fishing activities using various fishing gears have the potential to catch other types of biota as known as bycatch. This type of bycatch is generally still used either for sale or for personal consumption, but some are re-released again. This research aims to determine the composition of the main catch and bycatch obtained by crab fishermen from Danasari Village, Pemalang. The research was carried out from July to August 2022. The data collection method was purposive sampling by going out to sea with fishermen to crab fishing grounds. The composition of the main catch and bycatch obtained at crab fishing locations consists of 1 type of main catch and 21 types of bycatch. The composition of the blue swimming crab is dominated by male crabs with a ratio of 1:0.7, with a mode of carapace width that is larger than female crabs, namely 107-115 mm. The proportion of bycatch obtained was only 25.73% from the total catch, with the useable bycatch amount more than the discarded bycatch. The ecological index shows that the value of species diversity and evenness is in the medium category with a value of 2.114 and 0.6944, while the dominance value is in the low category with a value of 0.1703. Useable bycatches that are commonly found are Orastoquilla oratoria, Scylla sp., and Babylonia spirata. The percentage of main catch is higher than bycatch, which indicates that fishing activities are still environmentally friendly, but the use of bycatch needs to be increased. It is hoped that data on the composition of bycatch types from Danasari Village fishermen can provide information on the potential of marine products other than crab, or could be said to be another alternative as a catch target to reduce exploitation of blue swimming crab resources. Aktivitas penangkapan perikanan rajungan dengan berbagai alat tangkap memiliki potensi terdapat jenis tangkapan biota lain atau disebut sebagai tangkapan samping. Jenis tangkapan samping (bycatch) umumnya tetap dimanfaatkan baik untuk dijual maupun sebagai konsumsi pribadi, namun ada juga yang dilepas kembali. Penelitian ini bertujuan untuk mengetahui komposisi tangkapan utama dan tangkapan samping yang didapatkan oleh nelayan rajungan dari Desa Danasari, Pemalang. Penelitian dilaksanakan selama bulan Juli sampai dengan Agustus 2022. Metode pengambilan data secara purposive sampling, yaitu ikut pergi melaut dengan nelayan ke lokasi penangkapan rajungan. Komposisi jenis tangkapan utama dan tangkapan samping yang didapatkan di lokasi penangkapan rajungan terdiri atas 1 jenis tangkapan utama dan 21 jenis tangkapan samping. Komposisi tangkapan utama rajungan didominasi oleh rajungan jantan dengan rasio 1:0,7, dengan modus ukuran lebar karapas yang lebih besar dibanding rajungan betina yaitu 107-115 mm. Proporsi tangkapan samping yang didapatkan hanya sebesar 25,73% dari total tangkapan keseluruhan, dengan jumlah tangkapan samping bernilai ekonomi lebih banyak dibandingan yang terbuang. Indeks ekologi menunjukkan nilai keanekaragaman dan keseragaman jenis termasuk kategori sedang dengan nilai 2,114 dan 0,6944, sedangkan nilai dominansi termasuk kategori rendah dengan nilai 0,1703. Tangkapan samping bernilai ekonomi (useable bycatch) yang umum ditemukan yaitu Orastoquilla oratoria, Scylla sp., dan Babylonia spirata. Persentase hasil tangkapan utama lebih tinggi dibandingkan tangkapan samping yang mengindikasikan aktivitas perikanan yang masih ramah lingkungan, namun pemanfaatan bycatch perlu untuk ditingkatkan. Data komposisi jenis tangkapan samping dari nelayan Desa Danasari diharapkan dapat menjadi informasi potensi hasil laut selain rajungan, atau bisa dikatakan sebagai alternatif lain sebagai target tangkapan untuk mengurangi eksploitasi sumberdaya rajungan. Crab fishing activities using various fishing gears have the potential to catch other types of biota as known as bycatch. Thistype of bycatch is generally still used either for sale or for personal consumption, but some are re-released again. This researchaims to determine the composition of the main catch and bycatch obtained by crab fishermen from Danasari Village,Pemalang. The research was carried out from July to August 2022. The data collection method was purposive sampling bygoing out to sea with fishermen to crab fishing grounds. The composition of the main catch and bycatch obtained at crabfishing locations consists of 1 type of main catch and 21 types of bycatch. The composition of the blue swimming crab isdominated by male crabs with a ratio of 1:0.7, with a mode of carapace width that is larger than female crabs, namely 107115mm.Theproportionofbycatchobtainedwasonly25.73%fromthetotalcatch,withtheuseablebycatchamountmorethanthediscardedbycatch.Theecologicalindexshowsthatthevalueofspeciesdiversityandevennessisinthemediumcategorywithavalueof2.114and0.6944,whilethedominancevalueisinthelowcategorywithavalueof0.1703.UseablebycatchesthatarecommonlyfoundareOrastoquillaoratoria,Scyllasp.,andBabyloniaspirata.Thepercentageofmaincatchishigherthanbycatch,whichindicatesthatfishingactivitiesarestillenvironmentallyfriendly,buttheuseofbycatchneedstobeincreased.ItishopedthatdataonthecompositionofbycatchtypesfromDanasariVillagefishermencanprovideinformationonthepotentialofmarineproductsotherthancrab,orcouldbesaidtobeanotheralternativeasacatchtargettoreduceexploitationofblueswimmingcrabresources.Keywords:Non-targetSpecies,Diversity,Evenness,Dominance,Discard Abstrak Aktivitas penangkapan perikanan rajungan dengan berbagai alat tangkap memiliki potensi terdapat jenis tangkapan biotalain atau disebut sebagai tangkapan samping. Jenis tangkapan samping (bycatch) umumnya tetap dimanfaatkan baikuntuk dijual maupun sebagai konsumsi pribadi, namun ada juga yang dilepas kembali. Penelitian ini bertujuan untukmengetahui komposisi tangkapan utama dan tangkapan samping yang didapatkan oleh nelayan rajungan dari DesaDanasari, Pemalang. Penelitian dilaksanakan selama bulan Juli sampai dengan Agustus 2022. Metode pengambilan datasecara purposive sampling, yaitu ikut pergi melaut dengan nelayan ke lokasi penangkapan rajungan. Komposisi jenistangkapan utama dan tangkapan samping yang didapatkan di lokasi penangkapan rajungan terdiri atas 1 jenis tangkapanutama dan 21 jenis tangkapan samping. Komposisi tangkapan utama rajungan didominasi oleh rajungan jantan denganrasio 1:0,7, dengan modus ukuran lebar karapas yang lebih besar dibanding rajungan betina yaitu 107-115 mm. Proporsitangkapan samping yang didapatkan hanya sebesar 25,73% dari total tangkapan keseluruhan, dengan jumlah tangkapansamping bernilai ekonomi lebih banyak dibandingan yang terbuang. Indeks ekologi menunjukkan nilai keanekaragamandan keseragaman jenis termasuk kategori sedang dengan nilai 2,114 dan 0,6944, sedangkan nilai dominansi termasukkategori rendah dengan nilai 0,1703. Tangkapan samping bernilai ekonomi (useable bycatch) yang umum ditemukan yaituOrastoquilla oratoria, Scylla sp., dan Babylonia spirata. Persentase hasil tangkapan utama lebih tinggi dibandingkantangkapan samping yang mengindikasikan aktivitas perikanan yang masih ramah lingkungan, namun pemanfaatan bycatchperlu untuk ditingkatkan. Data komposisi jenis tangkapan samping dari nelayan Desa Danasari diharapkan dapat menjadiinformasi potensi hasil laut selain rajungan, atau bisa dikatakan sebagai alternatif lain sebagai target tangkapan untukmengurangi eksploitasi sumberdaya rajungan. 
Kajian Tingkat Timbal (Pb) di Perairan Pantai Semarang: Studi Kasus pada Kerang Darah Tazkia Aulia Kusumadiani; Sri Redjeki; Bambang Yulianto
Journal of Marine Research Vol 13, No 3 (2024): Journal of Marine Research
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jmr.v13i3.39367

Abstract

Masuknya zat ataupun komponen ke dalam lingkungan laut yang menyebabkan berkurangnya kualitas perairan disebut sebagai pencemaran laut. Logam berat merupakan salah satu bahan pencemar yang banyak ditemukan di lingkungan laut. Contohnya adalah timbal (Pb). Pencemaran lingkungan laut tidak hanya berdampak terhadap menurunnya kualitas perairan, akan tetapi juga berdampak pada manusia yang mengkonsumsi produk hayati laut. Pesisir Kota Semarang merupakan wilayah tersibuk di Jawa Tengah dengan tingginya berbagai aktivitas seperti pemukiman, transportasi darat dan laut, industri, perikanan, dan pertanian yang mengakibatkan tingginya masukan polutan ke lingkungan laut yang mengakibatkan turunnya kualitas perairan darat. Tujuan dari penelitian ini yaitu untuk mengetahui kandungan logam timbal (Pb) pada air, sedimen, dan kerang darah (A. granosa) di Perairan Pantai Semarang. Konsentrasi logam berat Pb dalam air dan sedimen dianalisis dengan menggunakan Flame AAS sedangkan untuk kerang darah menggunakan metode ICP. Kandungan Pb pada seluruh sampel di bulan Maret 2023 lebih rendah dibandingkan pada Januari 2023. Pb dalam air (0,059 – 0,067 mg/L) pada Januari 2023 telah melebihi nilai baku mutu (0,008 mg/L) sementara pada Maret 2023 adalah <0,003 mg/L. Konsentrasi sedimen pada Januari 2023 (20,19 – 22,47 mg/kg) dan Maret 2023 (6,03 – 6,763 mg/kg) tidak melebihi baku mutu (50 mg/kg). Pb dalam kerang darah pada Januari 2023 (0,118 – 0,134 mg/kg) dan Maret 2023 (<0,040 mg/kg) tidak melebihi baku mutu (1,5 mg/kg). Perhitungan asupan aman konsumsi kerang darah untuk mengetahui batas aman konsumsi kerang darah pada berat badan 55 dan 60 kg masing masing adalah 10,261-11,653 kg/minggu dan 11,194-12,712 kg/minggu. Hasil penelitian diharapkan dapat menjadi acuan dalam melihat tingkat pencemaran logam yang ada di Perairan Pantai Semarang.The entry of substances or components into the environment that caused a reduction in the quality of waters is known as marine pollution. Heavy metals are one of the most pollutant materials found in the marine environment. Example of heavy metal is lead (Pb). Contamination in the marine environment not only has an impact on decreasing water quality, but also on humans who consume marine biological products. The coastal of Semarang City known as busiest area in Central Java with high levels of various activities such as settlements, land and sea transportation, industry, fisheries, and agriculture which result in a high input of pollutants into the marine environment that make a decline in the quality of inland and sea waters. Purpose of this study is to determine content of heavy metal lead (Pb) in water, sediment, and blood shells (Anadara granosa) in Semarang Coastal waters. Concentration of heavy metal Pb in water and sediment was analyzed using Flame AAS while for blood shells using the ICP method. Pb content in all sample in March 2023 is lower than January 2023. Pb content in water (0,059 - 0,067 mg/L) in January 2023 has exceeded the quality standard value (0,008 mg/L) meanwhile in March 2023 Pb is <0,003 mg/L. Sediment concentration in January 2023 (20,19-22,47 mg/kg) and in March 2023 (6,03 – 6,763 mg/kg) did not exceed the quality standard (50 mg/kg). Pb content in blood shells in January 2023 (0,118 – 0,134 mg/kg) and in March 2023 (<0,040 mg/kg) did not exceed the quality standard (1,5 mg/kg). Calculation safe intake consumption of blood shells to determine the safe limit consumption of blood shells at 55 kg and 60 kg body weight respectively is 10,261 – 11,653 kg/week and 11,194 – 12,712 kg/week. The research results are expected to be a reference in looking at the level of metal pollution in Semarang Coastal Waters.
Pengaruh Luasan Tutupan Kanopi Terhadap Tingkat Kerusakan Hutan Mangrove di Taman Edukasi Mangrove Purworejo, Jawa Tengah Sean Dewa Ramadhan; Wilis Ari Setyati; Sri Redjeki
Journal of Marine Research Vol 14, No 1 (2025): Journal of Marine Research
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jmr.v14i1.41497

Abstract

Mangrove adalah ekosistem yang memiliki ciri habitat khas dan unik dari segi vegetasi dan faunanya. Desa Gedangan merupakan salah satu desa yang memiliki ekosistem mangrove di wilayah Kecamatan Purwodadi, Kabupaten Purworejo, Jawa Tengah.Vegetasi mangrove di Desa Gedangan mengalami degradasi yang disebabkan oleh penebangan pohon, konversi lahan menjadi tambak ikan dan udang, pembangunan pemukiman dan pembuatan lahan pertanian. Penelitian bertujuan menganalisis persentase tutupan kanopi dan menganalisis tingkat kerusakan mangrove. Penelitian dilakukan di Taman Edukasi Mangrove Desa Gedangan pada bulan Mei-Juni 2022. Materi yang digunakan pada penelitian yaitu tumbuhan mangrove. Metode yang digunakan dalam penelitian yaitu metode deskriptif dengan penentuan lokasinya menggunakan metode purposive sampling. Pengambilan data persentase tutupan kanopi mangrove menggunakan metode Hemispherical photography. Pengambilan sampel pada penelitian bertujuan untuk menganalisis kandungan bahan organik dan karbon di dalam substrat. Parameter lingkungan meliputi suhu, salinitas, pH, dan DO diukur secara insitu yang bertujuan untuk mengetahui kondisi perairan sekitar mangrove. Hasil penelitian nilai kerapatan mangrove jenis Rhizpohora mucronata yaitu 7567 (stasiun 1), 7467 (stasiun 2), 9433 (stasiun 3). Nilai kerapatan mangrove jenis Rhizophora mucronata memiliki kriteria baik dengan kerapatan yang padat sedangkan pada jenis Sonneratia alba memiliki kriteria rusak dengan kerapatan yang jarang, hal ini berdasarkan analisa kriteria baku kerusakan mangrove. Tutupan kanopi mangrove didapatkan hasil persentase sebesar 87,11% (stasiun 1), 89,38% (stasiun 2), 74,68% (stasiun 3). Kandungan bahan organik memiliki hasil sebesar 8,291% (stasiun 1), 8,541% (stasiun 2), 12,221 (stasiun 3). Kandungan karbon memiliki hasil sebesar 4,809% (stasiun 1), 4,954 (stasiun 2), 7,088% (stasiun 3). Mangroves are ecosystems characterized by unique habitat features and distinctive vegetation and fauna. Gedangan Village is one of the villages with a mangrove ecosystem located in the Purwodadi District, Purworejo Regency, Central Java. The mangrove vegetation in Gedangan Village has experienced degradation due to tree cutting, land conversion into fish and shrimp ponds, urban development, and agricultural land expansion. The research aims to analyze the percentage of canopy cover and assess the level of mangrove damage. The study was conducted at the Mangrove Education Park in Gedangan Village in May-June 2022, using mangrove plants as the research material. The research utilized a descriptive method with location selection through purposive sampling. Canopy cover percentage data of mangroves were collected using Hemispherical Photography. Samples were taken to analyze the substrate's organic matter and carbon content. Environmental parameters, including temperature, salinity, pH, and dissolved oxygen, were measured ex situ to assess the water conditions around the mangroves. The research results indicated that the density value of Rhizophora mucronata mangrove species was 7567 (Station 1), 7467 (Station 2), and 9433 (Station 3). Rhizophora mucronata mangroves were classified as having a "good" condition with dense density, while Sonneratia alba mangroves were categorized as "damaged" with sparse density, based on the analysis using mangrove damage criteria (Minister of Environment Decree No. 201 of 2004). Canopy cover of mangroves yielded percentage results of 87.11% (Station 1), 89.38% (Station 2), and 74.68% (Station 3). The organic matter content was measured at 8.291% (Station 1), 8.541% (Station 2), and 12.221% (Station 3), while the carbon content was found to be 4.809% (Station 1), 4.954% (Station 2), and 7.088% (Station 3).
Variasi Ukuran Kerang Hijau (Perna viridis) Di Pesisir Tambak Lorok,Semarang Ghani Hakim Hakim; Nur Taufiq-Spj; Sri Redjeki
Journal of Marine Research Vol 13, No 4 (2024): Journal of Marine Research
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jmr.v13i4.43127

Abstract

Kerang hijau (Perna viridis) merupakan salah satu kerang yang hidup di daerah estuari, teluk, dan daerah mangrove yang memiliki substrat pasir berlumpur dengan salinitas yang sedikit lebih rendah. Kerang hijau merupakan salah satu kerang yang mampu bertahan hidup dan berkembang biak pada tekanan ekologis yang tinggi tanpa gangguan dan tanpa persediaan pakan. Kerang hijau tersebar luas di wilayah perairan Indonesia dan spesiesnya melimpah di wilayah pesisir, mangrove, dan muara sungai. Kawasan Tambak Lorok Kecamatan Semarang Utara merupakan wilayah pesisir di wilayah Pantai Utara. Daerah tersebut memiliki sumberdaya hayati berupa kerang hijau (Perna viridis). Adanya perbedaan ukuran panjang, tebal cangkang, dan berat daging dipengaruhi oleh kondisi perairan dan waktu pemijahan. Tujuan dari penelitian ini adalah mengetahui variasi morfometri ukuran kerang hijau (Perna viridis). Metode yang digunakan pada penelitian ini menggunakan metode deskriptif eksploratif. Hasil perhitungan hubungan panjang dan berat kerang hijau (P.viridis) dari Sampel pertama dan kedua memiliki nilai konstanta b<3 yang berarti allometrik negatif yaitu pertumbuhan panjang lebih dominan daripada pertumbuhan berat. Hasil pengukuran menunjukkan ukuran panjang, tebal cangkang, dan berat daging P.viridis beragam pada setiap stasiun pengambilan sampel. Frekuensi kehadiran P.viridis dalam berbagai ukuran selama dua Sampel pada dua stasiun tersebut juga bervariasi,selalu ada perbedaan ukuran P.viridis yang di ambil dari perairan Tambak Lorok. Green mussel (Perna viridis) is one of the shellfish that live in estuaries, bays and mangrove areas which have muddy sand substrates with slightly lower salinity. Green mussel is one of the shellfish that are able to survive and reproduce under high ecological pressure without disturbance and without food supplies. Green mussel is widespread in Indonesian waters and the species is abundant in coastal areas, mangroves and river estuaries. The Tambak Lorok area, North Semarang District, is a coastal area in the North Coast region. This area has biological resources in the form of green mussel (Perna viridis). The differences in length, shell thickness and meat weight are influenced by water conditions and spawning time. The aim of this research is to determine the morphometric variations in size of green mussel (Perna viridis). The method used in this research uses an exploratory descriptive method. The results of calculating the relationship between length and weight of green mussel (P.viridis) from the first and second Sample have a constant value of b<3 which means negative allometric meaning that length growth is more dominant than weight growth. The measurement results showed that the length, shell thickness and meat weight of P.viridis varied at each sampling station. The frequency of presence of P. viridis in various sizes during the two Sample at the two stations also varied, there was always a difference in the size of P. viridis taken from Tambak Lorok waters.    
Analisis Kesesuaian dan Daya Dukung Ekowisata Kawasan Mangrove Baros, Bantul, Yogyakarta Assifa Yusan Anandita; Sri Redjeki; Hadi Endrawati
Journal of Marine Research Vol 13, No 2 (2024): Journal of Marine Research
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jmr.v13i2.40544

Abstract

Kawasan ekowisata menjadi salah satu destinasi wisata yang banyak dikunjungi oleh wisatawan karena pemandangan alam dan suasananya. Mangrove Baros, Bantul, Yogyakarta menjadi salah satu kawasan ekowisata yang mulai dikembangkan tahun 2022 dan banyak dikunjungi hingga ratusan pengunjung setiap harinya. Kondisi hutan mangrove perlu diperhatikan dalam pelaksanaan ekowisata sehingga diperlukan perhitungan Indeks Kesesuaian Wisata serta Daya Dukung Kawasan untuk memberikan informasi terkait kondisi di kawasan ekowisata tersebut. Tujuan penelitian yaitu untuk mengetahui nilai Indeks Kesesuaian Wisata (IKW), menghitung Daya Dukung Kawasan (DDK) yang menampilkan jumlah wisatawan yang dapat ditampung pada kawasan ekowisata. Metode yang digunakan dalam penelitian yaitu kualitatif deskriptif dengan melakukan peninjauan langsung ke kawasan mangrove. Penelitian dilakukan pada 5 stasiun dengan parameter yang diambil yaitu ketebalan mangrove, kerapatan mangrove, jenis mangrove, objek biota dan pasang surut serta data sekunder berupa wawancara dan kuisioner. Nilai IKW yang didapatkan dengan presentase tertinggi yaitu stasiun 5 sebesar 64,1% dan presentase terendah pada stasiun 4 sebesar 41% Stasiun 1, 2, 3 dan 4 masuk ke dalam kategori tidak sesuai dan hanya stasiun 5 yang masuk ke dalam kategori sesuai. Hasil perhitungan DDK didapatkan sebesar 282 orang/hari dengan melakukan kegiatan seperti wisata mangrove, memancing dan rekreasi. Rehabilitasi mangrove perlu dilakukan untuk meningkatkan nilai IKW karena ketebalan mangrove dalam kategori kurang karena faktor utama yang setiap tahunnya mengancam kawasan mangrove yaitu banjir rob.Ecotourism area is one of the most visited tourist destinations by tourists because of its natural scenery and atmosphere. Baros Mangrove, Bantul, Yogyakarta is one of the ecotourism areas which will begin to be developed in 2022 and is visited by hundreds of visitors every day. The condition of mangrove forests needs to be considered in the implementation of ecotourism so that it is necessary to calculate the Tourism Suitability Index and Area Supporting Capacity to provide information regarding conditions in the ecotourism area. The research objective is to determine the value of the Tourism Suitability Index (TSI), calculate the Regional Support Capacity (CC) which displays the number of tourists that can be accommodated in ecotourism areas. The method used in this research is descriptive qualitative by observing the mangrove forest directly. The research was conducted at 5 stations with parameters taken, namely mangrove thickness, mangrove density, mangrove species, biota and tidal objects as well as secondary data in the form of interviews and questionnaires. The TSI value obtained with the highest percentage is station 5 of 64.1% and the lowest percentage is at station 4 of 41% Stations 1, 2, 3 and 4 categorized as an inappropriate category and only station 5 categorized as the appropriate category. The CC calculation results obtained were 282 people/day by carrying out activities such as mangrove tours, fishing and recreation. Mangrove rehabilitation needs to be done to increase the TSI value because the thickness of the mangroves is in the less category because the main factor that threatens the mangrove area every year is tidal flooding.
Co-Authors Abdul Ghofar Adi Santoso Aditya Dwi Nugroho Agus Sabdono Ahmad Yassin Ali Djunaedi Ali Djunaedi Ambariyanto Ambariyanto Anggit Sapta Raudina Annisa Rahma Firdaus Argina Dewi S Assifa Yusan Anandita Aufa Anam Aulia Dessy Ramadhani Auliya Afrianti Ayu Safitri Azis Nur Bambang Bagas Santosa Bagus Eko Hardiono Bambang Yulianto Bayu Khrisna Yudhatama Bintang Septiarani Cantika Elistyowati Andanar Chrisna Adhi Suryono Delianis Pringgenies Delianis Pringgenies Diah Ayu Mustofa Diah Permata Wijayanti Dyanita Havshyari Putri Andrykusuma Edi Wibowo Edi Wibowo Kushartono Edy Supriyo Elsa Lusia Agus Elsa Lusia Agus Endang Sri Susilo Endika Meirawati Fabian Panji Ayodya Ghani Hakim Hakim Hadi Endrawati Hans Arthur Philips Hargo Seno Wahyu Edi Henrian Rizki Pradana Hudanu Hapsara Ibnu Pratikto Ika Ayuningtyas Ika Desie Wulandari Inggrid Debora Hutagaol Iqbal Maulana Irwani Irwani Irwani Irwani Isa Anzori Ita Riniatsih Ita Widowati Jakfar Shodiq Panatar Jufri Ubay Jusup Suprijanto Kathan Joy Abelino Ken Suwartimah Ken Suwartimah Krisiyanto Krisiyanto Kurnia Adi Nusaputro Laras Kinanti Pinandita Lita Tyesta Addy Listya Wardhani Lutfil Hakim Baidhowie M. Amanun Tharieq M. Amanun Tharieq Marsella Ivon Citra Ningrum Mas’ad Arif Meutia Shibaa Nadaa Michael Abbey Michael Abbey Monica Virgiana Silvi Muhammad Zainuri Muhammad Zainuri Muhammad Zainuri Mustagfirin Mustagfirin Mustagpirin Mustagpirin Nando Arta Gusti Pamungkas Nirwani Soenardjo Nur Taufiq-Spj Panji Ayodya Parameswari Iccha Nirmalabuddhi Wishnuputri Praressha Wizurai R. Noer Pagripto W Rachellia Rose Nugraha Rachmaneta Novitasari Raden Ario Retno Hartati Retno W. Astuti Ria Azizah Ria Azizah Ria Azizah Tri Nuraini Rina Maharani Iksanti Rindika Wahyu Riska Novianti Putri Robertus Triaji Mahendrajaya Robertus Triaji Mahendrajaya Romadhon Romadhon Rudhi Pribadi Satrio Fahrul Ananda Sean Dewa Ramadhan Slamet Suharto, Slamet Sri Sedjati Sri Turni Hartati Sunaryo Sunaryo Surya Fajar Suryono Suryono Tazkia Aulia Kusumadiani Widianingsih Widianingsih Widianingsih Widianingsih Wilis Ari Setyati Yustin Ragil Dewanti