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Jurnal Kelautan Tropis
Published by Universitas Diponegoro
ISSN : 14108852     EISSN : 25283111     DOI : -
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Articles 451 Documents
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Thermostability and Photostability of Shrimp Waste Oil Based on Sun Protection Factor Value, Erythema Transmission, Pigmentation Transmission and Free Fatty Acid Content Agustiawan, Deri; Rahmalia, Winda; Alimuddin, Andi Hairil; Prayitno, Dwi Imam; Sayekti, Endah
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.22775

Abstract

The high production of shrimp is accompanied by an increase in by-products (cephalothorax, carapace, and tail), which are discarded as waste. Therefore, a solution is needed to convert shrimp waste into economic value products like shrimp waste oil (SWO). SWO contains fatty acids and astaxanthin, which have antioxidant activity to scavenge free radicals, so it can prevent skin damage such as wrinkles and dryness. Due to its fatty acids and astaxanthin content, SWO can be applied as a sunscreen. However, heating and irradiation can degrade bioactive compounds that are beneficial for health. Thermostability and photostability tests are needed to determine the best storage conditions for SWO based on sun protector factor (SPF) values, erythema transmission (%Te), pigmentation transmission (%Tp), and free fatty acid (FFA) content. The yield of SWO obtained was 2.569% from 100 grams of dry shrimp waste weight. Analysis by using FTIR showed the presence of astaxanthin content in SWO, while GC-MS showed that the SWO contains up to 32.66% of hexanoic acid. SWO thermostability and photostability tests showed a decrease in SPF values and an increase in %Te and %Tp as heating and irradiation time increased. This is due to the photobleaching effect. There was no significant change in the FFA value, indicating that SWO is quite resistant to heating and irradiation.
Distribution Nudibranch and Carnivorous Fish in The North Bali Sea Wirawan, Kadek Fendi; Munasik, Munasik; Suprijanto, Jusup; Pravitasari, Anggi Karina
Jurnal Kelautan Tropis Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i1.20168

Abstract

The presence or absence of certain types of carnivorous coralfish in a coral reef ecosystem accurately indicates the health of a coral reef ecosystem and the organisms associated with it; one of them is the nudibranch. This research aims to determine whether the presence of carnivorous fish in coral reef ecosystems affects the quality of the nudibranch life cycle and the distribution size in terms of predation. Nine carnivorous fish species were found at the three research stations, the largest group being triggerfish and grouper found in Lovina Reef and Menjangan island. Observed from the size distribution of nudibranchs, the presence of nudibranchs in the three research locations shows sizes ranging from small to large, namely from the Phyllididae nudibranch group. The dead body of the nudibranch was found in Tulamben reef, but it could not be confirmed whether the nudibranch was preyed by carnivorous fish. Carnivorous fish are not predators and do not affect the life cycle of nudibranchs observed from the complete size distribution of nudibranchs from small to large. Nudibranch predators cannot digest nudibranch bodies because their bodies are venomous; they use them as self-defense against the predators. Nudibranchia are not always found when preyed on by fish.
Ecobiology of Asian-moon Scallop Amusium pleuronectes (Linnaeus, 1758) in Kendal Regency Coast, Central Java Satriawan, Erian Febri; Suryono, Chrisna Adhi; Widowati, Ita; Saputri, Mimie
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.22493

Abstract

Asian moon scallops are one of the marine biological resource products that have the potential to be utilized optimally and in national and international trade and have high economic value. Kendal waters are one of the districts with significant Amusium pleuronectes resource potential to meet export needs in Indonesia, apart from the waters of Brebes, Tegal, Pemalang, Pekalongan, and Batang regencies. This research aims descriptively to explain the habitat characteristics of A. pleuronectes by connecting the condition of the relationship between body size and weight of A. pleuronectes and the parameters quality of the waters where the scallops are located, based on fishermen's fishing ground routes. A. pleuronectes was sampled using a fishing boat with a traditional arad net. The Global Positioning System (GPS) would be turned on when the arad net was finished being lifted, and the coordinates were recorded. The sampling stations were determined as 4 points, spread randomly (purposive sampling) along the route of fishermen catching A. pleuronectes. At the same time, water, sediment, and water parameter sampling was carried out. The samples were then taken to the laboratory for biometric measurements to determine the condition of the A. pleuronectes. Water samples were tested for chlorophyll-a and nitrate content, while sediment was tested for grain size and organic matter content. A Principal Component Analysis (PCA) analysis was conducted to determine the relationship between biometric parameters and water parameters. The results of this study showed that the scallops have a relationship between size and weight x<3, so they have negative allometry. These scallops have an average condition index of 51.12 and are in the medium category. In the preliminary survey, these scallops were dominated by the 4.1-5 cm size class. At stations 1-3, the size class 6.1-7 cm is dominated. A. pleuronectes were not found at station 4. These scallops showed a close relationship with salinity, depth, nitrate content, and silt substrate, with a higher content of coarse sand and clay as a substrate. There is little relation to organic matter, chlorophyll-a, temperature, dissolved oxygen, pH, gravel substrate, silt, and fine sand.
Evaluating the seagrass ecological condition and habitat extent in Karimunjawa National Park, Jepara Indonesia Kusnadi, Agus; Alifatri, La Ode; Chamidy, Ardian Nurrasyid; Rasyidin, Asep; Sobirin, Sobirin
Jurnal Kelautan Tropis Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i1.20637

Abstract

In the coastal ecosystem, seagrass meadows play a vital role in delivering ecosystem services such as provision, control, and support. However, this ecosystem is one of the most threatened in the coastal environment, and it has been degraded as a result of anthropogenic disturbance and rapid environmental changes. Furthermore, the extent of the seagrass meadows is unknown, and the health of the meadows is unmonitored and unrecorded. There is little information on the current state of the seagrass extent and health conditions in Karimunjawa National Park. We evaluate the abundance, states, and health conditions of the seagrass meadows based on the ecological quality index in Karimunjawa National Park, Jepara, Indonesia. This district has a vast extent of seagrass meadows but has been affected by the expansion of the industrial/tourism area within the region. This study aimed to assess the seagrass current condition based on the ecological quality index. The result showed that the total seagrass extent area in Karimunjawa National Park was 969,15 ha where seven species were found in this area, including Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, Cymodocea serrulate, Halodule pinifolia, Halophila ovalis and Halodule uninervis. Seagrass meadow coverages were moderate and categorized as less healthy. The seagrass ecological quality index value was 0.66 which indicated that the seagrass condition in Karimunjawa National Park was moderate. Ecological factors that affect the seagrass state are epiphyte cover and macroalgal cover. 
Estimasi Tutupan Kanopi Berdasarkan NDVI dan Kondisi Tutupan Tajuk Pada Ekosistem Mangrove Negeri Passo, Teluk Ambon Dalam Pietersz, Janson Hans; Pribadi, Rudhi; Pentury, Reinhardus; Ario, Raden
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.22090

Abstract

Mangrove canopy cover plays an important role in maintaining and protecting environmental stability in coastal areas, namely as a habitat for various terrestrial species and as protection from direct exposure to ultraviolet light on associated aquatic organisms. Mangrove canopy cover is important in protecting coastal areas from strong winds. This research aims to analyze the condition of the mangrove area, the condition of canopy cover based on the NDVI value and the percentage value of canopy closure, and the relationship between NDVI and percentage canopy closure. Sentinel-2B image data was processed using QGIS 3.28.13 and ArcGIS 10.8 software. Maximum likelihood classification is used to separate mangrove delineation from other objects, and an accuracy test is carried out using a confusion matrix to test the accuracy of the classification results. Observations were determined using a purposive sampling method, and canopy closure data was collected using a simple hemispherical photography method. The condition of canopy cover was analyzed based on NDVI calculations and calculation of the percentage of canopy closure, which was carried out using image-j software and Microsoft Excel 2010. The analysis showed that ten types of mangroves included seven families and eight genera with a mangrove area of 21.66 ha. 62.70% of the mangrove area has a canopy cover condition based on the NDVI value, which is very dense. Also, 50% of observation stations have a canopy cover condition based on the canopy cover percentage value, which is still classified as dense. The correlation between the NDVI value and the percentage value of mangrove canopy cover has a unidirectional relationship and a very strong relationship with a correlation coefficient r of 0.949.  Tutupan Kanopi mangrove sangat berperan penting dalam menjaga dan melindungi kestabilan lingkungan pada wilayah pesisir, yaitu sebagai habitat bagi berbagai macam spesies terestrial dan juga sebagai pelindung dari terpaan sinar ultraviolet secara langsung terhadap organisme perairan yang berasosiasi, tutupan kanopi mangrove juga sangat berperan penting dalam menjaga dan melindungi wilayah pesisir dari terpaan angin kencang. Penelitian ini bertujuan untuk menganalisis kondisi luasan mangrove, kondisi tutupan kanopi berdasarkan nilai NDVI dan nilai persentase tutupan tajuk mangrove, serta menganalisis hubungan NDVI dan persentase tutupan tajuk. Pengolahan data citra Sentinel-2B dilakukan dengan menggunakan software QGIS 3.28.13 dan ArcGIS 10.8. klasifikasi maximum likelihood digunakan untuk memisahkan delineasi mangrove dengan objek lainnya dan dilakukan uji akurasi dengan menggunakan confusion matrix untuk menguji keakuratan hasil klasifikasi. Penentuan stasiun pengamatan dilakukan dengan menggunakan metode purposive sampling serta pengambilan data tutupan tajuk dilakukan dengan menggunakan metode hemispherical photography sederhana. Kondisi tutupan kanopi dianalisis berdasarkan perhitungan NDVI dan perhitungan persentase tutupan tajuk mangrove yang dilakukan dengan menggunakan bantuan software image-j dan Microsoft Excel 2010. Hasil analisis menunjukkan bahwa dapat ditemukan 10 jenis mangrove yang terdiri dari 7 famili dan 8 genera dengan luasan mangrove sebesar 21,66 ha.  62,70% luasan mangrove memiliki Kondisi tutupan kanopi berdasarkan nilai NDVI tergolong sangat padat dan 50% stasiun pengamatan memiliki kondisi tutupan kanopi berdasarkan nilai persentase tutupan tajuk masih tergolong padat. Hubungan korelasi antara nilai NDVI dan nilai persentase tutupan tajuk mangrove memiliki hubungan korelasi searah dan memiliki hubungan yang sangat kuat dengan koefisien korelasi r sebesar 0,949.
Konsentrasi Mikroplastik Pada Makroalga Di Zona Intertidal, Pulau Karimunjawa Kurnianto, Yulius Deni; Hadisusan, Suwarno; Nugroho, Andhika Puspito
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.22788

Abstract

Distribution of microplastics is still difficult to predict then driven these particles could be found in various marine organisms including macroalgae. This study aimed to understand of shape, colors, size and polymer of microplastics especially found in macroalgae. Hydrogen peroxide (30% H2O2) was used as oxidation solvent and Zinc Chloride (ZnCL2) was used as seperation solution. Statistic analysis was performed by Anova to determine comparison of microplastic between morphological. This result suggested that found five shapes of microplastics (fiber, fragment, film, foam and pellet) with 7 colors and transparant. Fiber was type found predominanly (>80%), while black, blue and red were predominant in colors (88,82%). This study, however, exhibited no interaction between morphological feature and location aspect that suggested microplastic contamination was not affected by both aspects. Micropalstic were categorized into three different sizes in range, these were >1000 µm (36%), 500-1000 µm (30%) and 100-500 µm (34%). Allegedly, local source of microplastic originated from net, plastic single used, rope, float and fishing equipment including paint boats. Polymer was identifed including PE, PP, PS and PA (all nylon). Therefore, macroalga have a potential to trap microplastic. Distribusi mikroplastik di perairan sulit diprediksi sehingga partikel tersebut dapat ditemukan pada berbagai organisme laut termasuk makroalga. Tujuan dari penelitian ini untuk mengetahui karakteristik mikroplastik berdasarkan jenis, warna, ukuran dan tipe polimer mikroplastik pada makroalga. Metode oxidation menggunakan larutan Hydrogen peroxide 30% (H2O2) dan Zinc Chloride (ZnCL2) sebagai larutan densitas. Uji Anova untuk menentukan perbandingan kontaminasi mikroplastik berdasarkan fitur morfologi. Hasil penelitian menunjukan terdapat lima jenis kontaminasi mikroplastik (fiber, fragment, film, foam dan pellet) dalam variasi 7 warna dan transparan pada makroalga. Fiber merupakan jenis mikroplastik paling banyak ditemukan dibandingkan jenis lainnya (>80%), sedangkan aspek warna didominasi oleh warna hitam, biru, dan merah (88,82%). Meskipun demikian, tidak terdapat interaksi fitur morfologi dan lokasi dalam menentukan kontaminasi mikroplastik pada makroalga. Terdapat tiga kategori ukuran mikroplastik yaitu >1000 µm (36%), 100-500 µm (34%) dan 500-1000 µm (30%). Sumber mikroplastik lokal diduga berasal dari fragmentasi jaring tambak, sampah plastik, pelampung dan peralatan tangkap ikan termasuk cat kapal. Jenis polimer yang teridentifikasi yaitu PP, PE, PS dan PA (nylon). Dengan demikian, makroalga sebagai agen hayati dalam menjebak mikroplastik di perairan. 
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. 
Hubungan Ikan dengan Padang Lamun di Perairan Bangka Selatan, Kepulauan Bangka Belitung Haptari, Rapita; Aisyah, Siti; Adi, Wahyu; Farhaby, Arthur M; Henri, Henri; Ferizal, Jemi; Supratman, Okto
Jurnal Kelautan Tropis Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i1.20953

Abstract

South Bangka Regency is one of the districts that has the potential for fish biodiversity in seagrass meadows when viewed from its area and diversity.  Seagrass beds are areas that have the potential to be conservation sites from an ecological point of view and represent the sustainability of fish resources. This study aims to determine the richness of fish species, fish composition, abundance, diversity, uniformity and dominating fish as well as the relationship of seagrass cover to the abundance and biomass of fish found in southern Bangka Waters.  The study will be conducted in southern Bangka Regency in June 2023 covering 4 stations. Seagrass data collection in the form of seagrass cover using the quadratic transect method and swept area method (sweep) in fish data collection. The results of the study from the four stations there were 243 individuals including 23 species of fish from 18 families namely Alosidae, Apogonidae, Chaetodontidae, Engraulidae, Gerreidae, Labridae, Lethrinidae, Pinguipedidae, Platycephalidae, Scorpaenidae, Siganidae, Sphyraenidae, Syngnathidae, Terapontidae, Ambassidae, Gobiidae, Monacanthidae and Leiognathidae. The highest fish species composition was found at station 4, namely Gerres limbatus by 32.51% with 79 individuals. The abundance value found was 822 ind/ha and fish diversity was categorized as medium, fish uniformity tended to be high and dominance index was low. The abundance and biomass of fish are influenced by the percentage of seagrass cover, where the higher the percentage value of seagrass cover, the higher the abundance value and biomass of fish in the area. Kabupaten Bangka Selatan merupakan salah satu kabupaten yang memiliki potensi biodiversitas ikan di padang lamun jika dilihat dari luasan dan keanekaragamannya.  Padang lamun adalah kawasan yang berpotensi sebagai tempat konservasi dilihat dari sudut pandang ekologis dan mewakili keberlanjutan sumber daya ikan. Penelitian ini bertujuan untuk mengetahui kekayaan jenis ikan, komposisi ikan, kelimpahan, keanekaragaman, keseragaman dan ikan yang mendominasi serta hubungan tutupan lamun terhadap kelimpahan dan biomassa ikan yang ditemukan di Perairan Bangka bagian selatan.  Penelitian dilakukan di Kabupaten Bangka bagian selatan pada bulan Juni 2023 meliputi 4 stasiun. Pengambilan data lamun berupa tutupan lamun menggunakan metode transek kuadrat dan metode swept area (sapuan) pada pengambilan data ikan. Hasil penelitian dari keempat stasiun terdapat 243 individu mencakup 23 spesies ikan dari 18 famili yaitu Alosidae, Apogonidae, Chaetodontidae, Engraulidae, Gerreidae, Labridae, Lethrinidae, Pinguipedidae, Platycephalidae, Scorpaenidae, Siganidae, Sphyraenidae, Syngnathidae, Terapontidae, Ambassidae, Gobiidae, Monacanthidae dan Leiognathidae. Komposisi jenis ikan tertinggi terdapat pada stasiun 4 yaitu Gerres limbatus sebesar 32,51% dengan jumlah individu 79. Nilai kelimpahan yang ditemukan adalah 822 ind/ha dan keanekaragaman ikan dikategorikan sedang, keseragaman ikan cenderung tinggi dan indeks dominansi tergolong rendah. Adapun kelimpahan dan biomassa ikan dipengaruhi oleh persentase tutupan lamun, dimana semakin tinggi nilai persentase tutupan lamun maka semakin tinggi juga nilai kelimpahan dan biomassa ikan di area tersebut. 
Microfacies and paleoenvironmental study of Limestone of the Peneta Formation from Kerinci Area Akmaluddin, Akmaluddin; Nurhidayah, Efrilia Mahdilah; Agustin, Muhammad Virgiawan; Wirakusuma, Fadhil; Novian, Moch. Indra; Barianto, Didit Hadi
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.22263

Abstract

The research location is the Tebing Tinggi Village, Kerinci region - Jambi, part of the Barisan Zone. This study focuses on the limestone of the Peneta Formation, which is part of the Pre-Tertiary age. The research will investigate the characteristics of carbonate rocks in the Peneta Formation, including the developed facies, fossil content, and the diagenesis process in the Peneta Formation using field data, petrography, and XRD. Our research has succeeded in dividing the Limestone of the Peneta Formation into 3 lithofacies in the study area, including dismicrite, dolomitic limestone, and meta-mudstone. The lack of marine organisms and the dominance of the mudstone facies indicate that the limestone of the Peneta Formation was deposited in an evaporite or brackish zone environment. The limestone diagenesis process was also confirmed in this study. The research location is included in the mesogenesis stage due to the presence of foliation structures, decussate texture, and dolomite minerals until the telogenesis stage, which is characterized by sparite calcite blocky. Furthermore, forsterite and diaspore minerals were also identified through petrographic and XRD analysis, indicating the occurrence of metamorphic processes at our research location.
Analysis of Mangrove Leaf Litter Decomposition Rate in Mangrove Ecosystem of Muara Pagatan, South Kalimantan Selviani, Selviani; Zamani, Neviaty Putri; Natih, Nyoman Metta N; Tarigan, Nurhayati
Jurnal Kelautan Tropis Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i1.21913

Abstract

Mangroves are the dominant ecosystem in coastal areas and estuaries and one of the most productive ecosystems in the world. Mangroves are an essential component in a complex food chain and have the potential for the life of various marine and terrestrial biotas, microorganisms, and macroorganisms. The decomposition of mangrove leaf litter by fungal bacteria produces nutrient source that is beneficial for fish, shrimps, and crabs. This study discusses the production and decomposition rate of mangrove leaf litter in the mangrove ecosystem of Muara Pagatan, South Kalimantan. With transect and litter trap methods, litter production during the observation ranged from 218.51 - 858.28 g/m2/45day. Of the four types of mangroves found, the highest litter production was found in Rhizophora mucronata mangrove species at 858.28 g/m2/45day, followed by Bruguiera gymnorrhiza species at 268.52 g/m2/45day, and the lowest litter production was Avicennia marina mangrove species at 222.9 g/m2/45day and Sonneratia alba at 218.51 g/m2/45day. The remaining dry weight during observation ranged from 1.06 g - 2.46 g. In sum, the highest litter productivition and decomposition rate was found in Rhizophora species and litter was not completely decomposed after 45 days.

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