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All Journal JOURNAL OF COASTAL DEVELOPMENT ILMU KELAUTAN: Indonesian Journal of Marine Sciences BULETIN OSEANOGRAFI MARINA Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology GEMA TEKNOLOGI METANA Jurnal Perikanan dan Kelautan Journal of Marine Research BIOTROPIA - The Southeast Asian Journal of Tropical Biology Jurnal Kelautan Tropis JMM (Jurnal Masyarakat Mandiri) Marine Research in Indonesia Jurnal Ilmiah Samudra Akuatika Journal of Tropical Marine Science Budimas : Jurnal Pengabdian Masyarakat Economics and Digital Business Review Journal of Applied Geology Jurnal Suara Pengabdian 45 Prosiding Seminar Nasional Unimus Journal of Fisheries & Marine Jurnal Perikanan dan Kelautan Cakrawangsa Bisnis
Retno Hartati
Department Of Marine Science, Faculty Of Fisheries And Marine Science, Diponegoro University. Tembalang Campus, Semarang, Indonesia Tel. / Fax. +6224 7474698
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Infeksi Jamur pada Penyu di Pelestarian Penyu Pulau Kelapa Dua, Taman Nasional Laut Kepulauan Seribu, DKI Jakarta Hani’atun Nurfajriyah; Retno Hartati; Subagiyo Subagiyo; Isai Yusidarta; Mustalafin Mustalafin
Buletin Oseanografi Marina Vol 12, No 1 (2023): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v12i1.47765

Abstract

Penyu merupakan jenis reptil yang langka secara global berdasarkan IUCN Red List of Threatened Species, dan salah satu masalah dihadapi dalam kegiatan pelestarian penyu adalah penyakit, diantaranya disebabkan oleh jamur. Penelitian ini bertujuan untuk mengidentifikasi jenis jamur yang menginfeksi penyu, mengetahui jenis penyakit yang disebabkan oleh jamur, prevalensi infeksi jamur serta kondisi sanitasi dan keterkaitannya dengan kejadian infeksi jamur pada penyu di Pelestarian Penyu, Pulau Kelapa Dua, Taman Nasional Laut Kepulauan Seribu, DKI Jakarta. Pengamatan terjadinya infeksi dilakukan terhadap 216 ekor penyu yang ada di pelestarian penyu, yaitu pada flipper, mata, leher, pangkal ekor dan bagian plastron. Setiap dijumpai adanya infeksi jamur, dilakukan pengambilan sampel jamur dengan metode swabbing. Jumlah individu penyu yang terinfeksi dihitung dan dibandingkan dengan jumlah seluruh penyu yang diamati (diperoleh angka prevalensi infeksi jamur). Sampel jamur selanjutnya diisolasi pada media PDA (Potato Dextrose Agar) menggunakan metode spread plate. Isolat murni yang didapat diidentifikasi secara makroskopis dan mikroskopis (menggunakan mikroskop dengan pewarnaan menggunakan Lactophenol cotton blue).  Penelitian yang dilakukan di bulan Januari 2020 mendapatkan tiga ekor penyu hijau (Chelonia mydas) berusia 9 bulan yang terinfeksi jamur, sehingga angka prevalensi infeksi adalah 0,014% (sangat rendah). Hal ini dimungkinkan karena kondisi sanitasi yang baik dan pergantian air 2 kali sehari sehingga parameter kualitas air di bak pemeliharaan, seperti suhu, salinitas dan pH sesuai dengan persyaratan untuk pemeliharaan penyu. Isolate jamur yang menginfeksi penyu di pelestarian penyu ini teridentifikasi sebagai anggota dari genus Fusarium.   Turtles are endangered reptile based on the IUCN Red List of Threatened Species, and one of the problems faced in turtle conservation activities is disease, including fungi. This study aimed to identify the species of fungi that infect turtles, the prevalence of fungal infections and sanitary conditions and their relationship to the incidence of fungal infections in turtles in Turtle Conservation, Kelapa Dua Island, Thousand Islands Marine National Park, DKI Jakarta. Observations of the occurrence of infection were carried out on 216 turtles, i.e. on their flippers, eyes, neck, base of the tail and the plastron. When a fungal infection was found, fungal samples were taken using the swabbing method. The number of infected individual turtles was counted and the prevalence rate of fungal infection was obtained. The fungi samples were then isolated on PDA (Potato Dextrose Agar) media using the spread plate method. The pure isolates obtained were identified macroscopically and microscopically (using a microscope with staining using Lactophenol cotton blue). Research conducted in January 2020 found that three 9-month-old green turtles (Chelonia mydas) infected with fungi, so the prevalence rate of infection was 0.014% (very low). This is possible due to good sanitation conditions in which the water was changed twice a day so that the water quality parameters in the rearing tank, such as temperature, salinity and pH are in accordance with the requirements for turtle rearing. The isolates of fungi that infect turtles in turtle conservation were identified as members of the genus Fusarium.
Pengaruh Salinitas Terhadap Kandungan Lutein Spirulina platensis Donna Nur'Aurelya Mahardhika; Retno Hartati; Widianingsih Widianingsih
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.v12i1.34176

Abstract

Spirulina platensis merupakan mikroalga yang mengandung protein tinggi. Mikroalga ini tidak hanya bertindak sebagai sumber protein sel tunggal, tetapi juga memberikan beberapa manfaat lainnya antara lain sumber karotenoid, klorofil, serta sumber mikronutrien. Salah satu kandungan karotenoid yaitu lutein. Lutein memiliki manfaat sebagai antioksidan untuk melawan radikal bebas pada mata. Pertumbuhan mikroalga dipengaruhi oleh beberapa macam faktor lingkungan, salah satunya yaitu salinitas. Penelitian ini bertujuan untuk mengetahui pengaruh salinitas terhadap kandungan lutein pada S. platensis. Metode yang digunakan ialah eksperimen laboratoris. Mikroalga S. platensis dikultivasi dengan tiga perlakuan salinitas yang berbeda yaitu 15, 23, dan 27ppt. Pertumbuhan sel S. platensis diamati selama 5 hari kemudian dipanen untuk perhitungan biomassanya. Biomassa basah hasil kultivasi diekstraksi menggunakan pelarut aseton. Ekstrak aseton S. platensis kemudian dianalisis kandungan luteinnya secara spektrofotometri. Hasil penelitian menunjukkan salinitas berbeda tidak memberikan pengaruh nyata terhadap kandungan lutein S. platensis. Kandungan pigmen lutein S. platensis yang tertinggi terdapat pada salinitas 23 ppt sebesar 0.0113 µg/g.  Spirulina platensis is a microalga that contains high protein. This microalga is not only acts as a single cell protein source, but also provides several other benefits, including a source of carotenoids, chlorophyll, and a source of micronutrients. One of the carotenoids contents is lutein. Lutein has benefits as an antioxidant to fight free radicals in the eyes. Microalgae growth is influenced by several kinds of environmental factors, one of which is salinity. This study aims to determine the effect of salinity on lutein content in S. platensis. The method used is a laboratory experiment. Microalgae S. platensis was cultivated with three different salinity treatments, namely 15, 23, and 27ppt. The growth of S. platensis cells was observed for 5 days and then harvested for biomass calculation. Wet biomass from cultivation was extracted using acetone as a solvent. The acetone extract of S. platensis was then analyzed for its lutein content spectrophotometrically. The results showed that different salinity didn’t have a significant effect on the S. platensis. The lutein content of S. platensis is highest at 23 ppt (0.0113 µg/g).
Peningkatan Pertumbuhan Artemia sp. melalui Aplikasi Ekstrak Ulva sp. Natasya Erdza Aulia; Ervia Yudiati; Retno Hartati
Journal of Marine Research Vol 12, No 2 (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.v12i2.34629

Abstract

Kandungan gizi pada Artemia sp. merupakan salah satu faktor yang mempengaruhi penggunaannya Artemia sp. sebagai pakan alami pada budidaya biota laut. Ulva sp. memiliki potensi sebagai pakan Artemia sp. karena memiliki kandungan protein dan karbohidrat yang tinggi dan keberadaannya melimpah di Indonesia. Penelitian ini bertujuan untuk mengetahui pengaruh pemberian ekstrak Ulva sp. terhadap pertumbuhan Artemia sp. Metode penelitian yang digunakan adalah eksperimental menggunakan rancangan acak lengkap dengan berbagai konsentrai ekstrak Ulva sp. sebanyak 3 pengulangan. Laju pertumbuhan spesifik (SGR) dan laju pertumbuhan (GR) diukur setiap hari selama 5 hari, dan nilai toksisitas (LC50) menggunakan metode BSLT pada 24 jam dengan mengaplikasikan ekstrak Ulva sp. kepada Artemia sp. Hasil uji toksisitas dengan nilai LC50 sebesar 59603.40 ppm yang menunjukkan ekstrak Ulva sp. tidak toksik. Hasil penelitian menunjukkan bahwa Artemia sp. yang dipelihara dengan pemberian ekstrak Ulva sp. konsentrasi 1500 ppm mempunyai nilai laju pertumbuhan spesifik (SGR) tertinggi (29.15%) dan laju pertumbuhan (GR) tertinggi (329.58 um/day). ANOVA test menunjukkan pengaruh pada perbedaan konsentrasi Ulva sp. terhadap pertumbuhan Artemia sp. yang berbeda nyata. Penelitian ini menghasilkan pemberian ekstrak Ulva sp. mempengaruhi peningkatan pertumbuhan Artemia sp. Pertumbuhan Artemia sp. yang dipelihara dengan konsentrasi 1500 ppm memiliki nilai pertumbuhan paling tinggi. The nutritional content of Artemia sp. is one of the factors that influence the use of Artemia sp. as natural food for marine biota cultivation. Ulva sp. has potential as feed for Artemia sp. because it has a high protein and carbohydrate content and is abundant in Indonesia. This study aims to determine the effect of Ulva sp. on the growth of the toxicity of Artemia sp. The research method used is experimental using a completely randomized design using Ulva sp. extract with different concentration in 3 repetitions. Specific growth rate (SGR) and growth rate (GR) were measured daily for 5 days, and toxicity value (LC50) using the BSLT method at 24 hours by applying extracts of Ulva sp. to Artemia sp. The results of the toxicity test with an LC50 value of 59603.40 ppm which shows the extract of Ulva sp. is not toxic. The results showed that Artemia sp. which were maintained by administration of Ulva sp. concentration of 1500 ppm had the highest specific growth rate (SGR) (29.15%) and the highest growth rate (GR) (329.58 um/day). ANOVA test showed the effect on differences in concentrations of Ulva sp. on the growth of Artemia sp. significantly different. This research resulted in the administration of Ulva sp. affect the growth of Artemia sp. Growth of Artemia sp. reared with a concentration of 1500 ppm had the highest growth value.
Bioakumulasi Logam Berat Pb oleh Chlorella vulgaris Altysia Putriany; Widianingsih Widianingsih; Hadi Endrawati; Retno Hartati
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.v12i3.39205

Abstract

Usaha untuk menghilangkan logam berat merupakan suatu proses pengolahan air limbah yang sangat penting. Beberapa metode telah dilakukan baik dengan metode kimia maupun fisika, namun perlakuan secara biologi dianggap lebih murah dan aefektif.  Chlorella vulgaris merupakan salah satu jenis mikroalga yang mempunyai kemampuan menyerap dan menghilangkan logam berat seperti timbal (Pb) di air limbah.  Penelitian ini bertujuan untuk mengetahui pengaruh logam berat timbal (Pb) pada media pemeliharaan yang berbeda terhadap pertumbuhan dan bioakumulasinya pada C. vulgaris. . Metode eksperimen laboratorium dengan lima perlakuan konsentrasi logam berat timbal (Pb) pada media budidaya C vulgaris yang berbeda, yaitu 0, 25, 50, 75, dan 100 ppm. Setiap perlakuan dengan tiga ulanga. Mikroalga C. vulgaris dikultur selama 7 hari dan pada akhir penelitian kepadatannya dihitung dan kandungan Pbnya dianalisa dengan menggunakan Atomic Absorption SpectrophotometerHasil penelitian menunjukkan bahwa semakin tinggi konsentrasi Pb pada media, semakin menghambat pertumbuhan C. vulgaris. C. vulgaris mampu mengakumulasi logam Pb dengan efisiensi penyerapannya sebesar 0,34% pada konsentrasi 100 ppm. Analisis varian memperlihatkan konsentrasi Pb memberikan pengaruh yang nyata (p<0,05) pada pertumbuhan, dan kemampuan akumulasi Pb pada C. vulgaris.  In the wastewater treatment process, the removal of heavy metals is very important. The process has applied various chemical and physical methods, and the biological method is believed to be the most efficient and cheapest.  Chlorella vulgaris is one species of microalgae that has ability to absorb and accumulate heavy metals such as lead (Pb). Chlorella can grow in extreme environments and withstand outside influences, better than other types of microalgae. This study aims to determine the influence of lead (Pb) in the culture media on the growth and bioaccumulation of C. vulgaris. The laboratory experiment method was applied with several Pb concentrations in the culture media of C. vulgaris, i.e. 0, 25, 50, 75, and 100 ppm. The treatments were triplicated. The C. vulgaris was cultured for seven days, and in the end of the experiment, the density was counted, and the Pb was analyzed using Atomic Absorption Spectrophotometer The results showed that the higher concentrations of Pb in the culture media gave the most inhibiting growth of C. vulgaris. C. vulgaris accumulate Pb at a concentration of 100 ppm in the culture media with an absorption efficiency of 0.34%. It revealed that the difference in Pb concentration give significant effect (p<0.05) on the growth and Pb accumulation capability of C. vulgaris.
Environmental Characteristic of Phyllophorus sp. (Echinodermata, Holothuroidea, Phyllophoridae) Habitat in the Madura Strait, Indonesia Widianingsih Widianingsih; Retno Hartati; Hadi Endrawati
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.v26i3.15064

Abstract

Information on the environmental characteristics of many sea cucumber habitat is limited, despite these species exhibiting rapid exploitation and may lead to depletion. The present study combined a survey on many seawaters and sediment characteristics of habitat valuable aspidochirote holothurian, Sea Ball Cucumber, Phyllophorus sp. to compare with location with no sea cucumber in Madura Strait, Indonesia. Data from detailed surveys were used to compare both locations with measures of physical and chemical seawater parameters including temperature, salinity, dissolved oxygen, pH, phosphate, nitrate, ammonia, chlorophyll-a, total suspended solids, light transparency, and depth of water. The comparison was also carried out on physical and chemical parameters of surface sediment, i.e. phosphate, nitrate, ammonia, chlorophyll-a, grain size, total organic matter, and carbon-organic content. The data then were analyzed using Mann-Whitney U-Non Parametric Test with SPSS v. 16.  The result revealed that there were significant differences between sediment characteristics of Sea Ball Cucumber habitat and no Sea Ball cucumber location, but not for seawater. Seawater parameter value in Madura Strait showed in the range required for its life. This analyzes proved the importance of sediment characteristics for Phyllophorus sp. As benthic deposit feeders, they did not only utilize substrate underneath the body for its habitat but also primarily to supply their natural food. 
Peningkatan Kualitas Dan Kapasitas Produksi Olahan Pangan Berbasis Ikan Di Kota Semarang Ireng Sigit Atmanto; Retno Hartati; Edi Supriyo
Prosiding Seminar Nasional Unimus Vol 4 (2021): Inovasi Riset dan Pengabdian Masyarakat Post Pandemi Covid-19 Menuju Indonesia Tangguh
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Kegiatan pengabdian Penguatan Komoditi Unggulan Masyarakat ini bertujuan untukmengembangkan dan menerapkan alat teknologi tepat guna untuk meningkatkan produktivitaspengrajin makanan / olahan pangan berbasis ikan. Pengembangan dan penerapan alat pengemasvacum dan pencetak bakso UKM Mitra diharapkan dapat mereduksi waktu pembuatan dan pengemasbaik bandeng asap cabut duri maupun aneka bakso ikan. Bakso ikan masih dibuat secara manualsehingga memakan waktu cukup lama, sedang pengemas vacum diharapkan produk lebih kedapterhadap udara sehingga umur simpan lebih lama dan jangkauan pemasaran dapat lebih luas . Denganalat pencetak bakso kapasitas 13.800 biji/ jam dan pengemas vacum dari Tim pengabdian diharapkankapasitas meningkat 4 kali dari produksi secara manual serta lebih higienis.Adanya bantuan alatpengemas vacun produk lebih kedap terhadap udara hingga umur simpan mencapai 1 bulan sehinggapemasaran dapat lebih luas dan omset serta kesejahteraan UKM meningkat . Adapun pola pemecahanmasalah yang akan diterapkembangkan secara umum dibagi menjadi empat tahap, meliputi: desaindan pabrikasi alat pencetak bakso dan pengemas/sealer vacum, pelatihan penggunaan alat di UKMsasaran, pengoperasian alat dan monitoring serta uji keandalan alat/mesin. Kegiatan pelatihandiharapkan agar UKM Mitra dapat memperoleh bekal dalam perancangan dan pabrikasi alat teknologitepat guna. Pengujian terhadap keandalan alat proses dilakukan untuk mengetahui tingkatkeragaman hasil produksi dari mesin tersebut. Untuk mempercepat proses transfer teknologi danmempermudah penerapan dilapangan khususnya yang terkait cara pengoperasian peralatan, makadibuatkan petunjuk pengoperasian (SOP) Kata Kunci : bakso ikan, bandeng asap, pencetak bakso, vacum sealer
Phytochemical Screening and Toxicity Test of Various Extracts from Microalgae Dunaliella salina Yosi Yananda Sijabat; Wilis Ari Setyati; Retno Hartati
Jurnal Ilmiah Perikanan dan Kelautan Vol. 15 No. 1 (2023): JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jipk.v15i1.36282

Abstract

Highlight Research Extract N-hexane of salina contains alkaloids, steroids, triterpenoids, and phenols Extract Ethyl Acetate of salina contains alkaloids, steroids, triterpenoids, phenols, flavonoid, and saponins Extract Methanol of salina contains alkaloids, steroids, triterpenoids, phenols, flavonoid, and saponins 24- hours LC50 value of the n-hexane extract salina was 276 ppm, the ethyl acetate extract was 673 ppm and the methanol extract was 811 ppm. All of the three extracts were included in toxic category   Abstract Microalgae are single celled microorganisms as the primary producers in the water food cycle. Microalgae bioactive compounds was estimated to be 10 times more diverse than compounds produced by land plants. Microalgae use nutrients more efficiently to grow, metabolize, and produce chemical compounds. Dunaliella salina is a type of chlorophyte microalgae with a lot of potential to be used in various fields. This study aimed to determine the phytochemical compound content and the value of lethal toxicity (24-hour LC50) in microalgae D. salina extract with different solvents. The multistage maceration method uses n-hexane, ethyl acetate, and methanol to extract samples. Phytochemical screening uses reagents according to the content of secondary metabolites. The Brine Shrimp Lethality Test method is used to test toxicity. The extracts were tested by using 10 Artemia salina against five concentrations, namely 0, 1, 10, 100, and 1000 ppm. Toxicity data were processed through probit analysis to get the 24-hour LC50 value. The results showed that alkaloids, steroids, triterpenoids, and phenols were found in the methanol, ethyl acetate, and n-hexane extracts. Saponin were found in the methanolic extracts. Flavonoid were found in the methanol and ethyl acetate extracts. The 24-hour LC50 value of the n-hexane extract was 276 ppm, the methanol extract was 811 ppm, and ethyl acetate extract was 673 ppm. The three extracts were included in toxic category. Extracts of microalgae D. salina have plenty secondary metabolite, that can be used in various fields and holds the potential as an anticancer.
Potensi Antibakteri Dari Ekstrak Polychaeta Namanereis sp. Putri, Ni Putu Purba Nava Vidyadhari; Widianingsih, Widianingsih; Suryono, Suryono; Hartati, Retno
Journal of Tropical Marine Science Vol 6 No 2 (2023): Journal of Tropical Marine Science
Publisher : Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jour.trop.mar.sci.v6i2.3810

Abstract

Namanereis sp. diklasifikasikan kedalam Famili Nereididae, Kelas Polychaeta. Penelitian tentang Polychaeta di Indonesia masih merupakan penelitian dasar yang meliputi taksonomi, ekologi serta struktur komunitas. Penelitian tentang kandungan nutrisi, pakan alami dan kandungan bahan aktif masih jarang dilakukan. Pada penelitian ini, dilakukan upaya penelitian tentang potensi antibakteri dari ekstrak Namanereis sp. dengan pelarut Etil Acetate. Oleh karena itu penelitian ini memiliki tujuan untuk mengetahui aktivitas antibakteri dari ekstrak Namanereis sp terhadap bakteri Aeromonas hydrophila, Vibrio parahaemolyticus, dan Vibrio harveyi. Metode yang digunakan dalam penelitian ini adalah experiment laboratorium. Perlakukan konsentrasi ekstraksi Namanereis sp. Pada ekstrasi dengan pelarut etil acetate dipergunakan perbandingan 1:4. Bakteri yang digunakan dalam penelitian ini adalah A. hydrophila, V. parahaemolyticus, dan V. harveyi yang diperoleh dari BBPAP Jepara. Berdasarkan hasil penelitian, zona hambatan tertinggi yang terbentuk untuk V. harvei pada konsentrasi 100% adalah sebesar 3.18 ± 0.33cm2, zona hambatan untuk A. hydrophila adalah 2,96 ± 0,45cm2 dan zona hambatan yang terbentuk untuk bakteri V. parahaemolyticus adalah 2,7 ± 0.91cm2. Penelitian ini menunjukkan ekstrasi Namaneries sp dengan menggunakan pelarut etil acetate dapat membentuk zona hambatan untuk setiap perlakukan konsentrasi ekstrak Namanereis sp yang diberikan (6,25, 12,5. 25, 50 dan 100%).
Seasonal Constellation of Juvenile Whale Sharks in Gorontalo Bay Coastal Park Yasir, Moh.; Hartati, Retno; Indrayanti, Elis; Amar, Fahri; Tarigan, Ariyo Imanuel
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 2 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.2.241-253

Abstract

The whale shark (Rhincodon typus Smith, 1828) is the largest extant fish species in the world, and it is endangered, with population numbers declining in the last three decades. The appearance of whale sharks in the Botubarani Waters has attracted a lot of attention. Therefore, this study aimed to determine the whale shark's appearance, their habitat constellation pattern, and its oceanographic conditions. This research was conducted during the 2019-2022 period. The Photographic Identification (Photo-ID) method is used to observe and determine whale shark individual's number and pattern of presence. Oceanographic data includes chlorophyll-a concentration using Ocean Color Image (CCI) data and sea surface temperature (SST) using OSTIA image data processed with Interactive Data Language (IDL) software. The research showed there are 38 individuals with an estimated total length ranging from 2.3 to 7.3 meters. All whale sharks appearing in Botubarani include juvenile male individuals with a composition of 53% new individuals (N=20) and 47% (N=18) old individuals seen again with a rare seasonal and sporadic presence pattern mainly in the Eastern season (June). The average SST value during the study period ranged from 28.36-30.29⁰C while chlorophyll-a ranged from 0.174-0.698 mg.m-3. Although the present findings show that the whale shark's appearance in Botubarani waters was not significantly influenced by SST and chlorophyll-a, it might be affected by other oceanography factors such as Sea Surface Height Distribution (SSHD) and depth (Bathymetry). As the Botubarani aggregation site is the only whale shark emergence area with easy access throughout the year and is rapidly developing into a new ecotourism industry in Indonesia; the information on whale shark appearance provides useful support for the sustainable protection and Whale Sharks conservation in the future.
Blue Swimming Crab’s Conservation Area Determination in The North of Java Sea Using Reproductive Indicator Putri Novianingrum, Milka; Hartati, Retno; Pribadi, Rudhi; Käll, Sofia; Redjeki, Sri
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 4 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.4.321-333

Abstract

Despite being operated on a small scale, Blue Swimming Crab (BSC), Portunus pelagicus fishery substantially contributes to Indonesia's fisheries as the country's third-largest export commodity after tuna and shrimp. The high of BSC’s demand led to pressure on its stock. Hence a conservation area is needed to be set up, in this study, was proposed using reproduction indicators. with the case study of BSC Stock in Keboromo Waters, Pati Regency, North Central Java. The samples were collected from 38 sampling points at a distance of 2-12 miles from the coastline during November-December 2022 using collapsible crab traps.  A reproduction observation on female crabs was carried out on their carapace width and gonad maturity stage. The data then were analyzed for the percentage of egg-berried females (EBF), size at first maturity (Lm) and first captured (Lc), and their spawning potential Ratio (SPR).  This study found that the mature crabs (GMS2) in November and December were higher than in other stages while the proportion of ovigerous females (EBF) in December was higher than in November. At several sampling points, the size at first captures (Lc) was higher than that at first maturity (Lm) indicating a decrease in resource stocks due to a delay in the recruitment process. SPR of 19% showed that reproductive potential should be maintained before recruitment is limited, therefore based on the existence of EBF in particular sampling points it is recommended three conservation areas as a temporary no-take zone in BSC fishing ground in Keboromo Watres, Pati Regency.
Co-Authors Aan Pratama Abdul Ghofir Abdul Hadi Abdul Latif Mahakar Abdul Muis Prasetia, Abdul Muis Abdullah Afif Abdullah Afif Abidin Nur II Achmad Muhajir Adi Santoso Adiyoga, Diaz Agus Sabdono Agus Trianto Agustiningsih, Luluk Akbarinissa, Rr. Dyah Artati Akhmad Syarifudin Aklif Reza Muttaqin Aldion Adin Nugroho Ali Djunaedi Ali Djunaedi Ali Junaedi Ali Ridlo Altysia Putriany Amalia Rofiah Amalia Rofiah Amar, Fahri Ambariyanto , Ambariyanto Ambariyanto Anak Agung Istri Sri Wiadnyani Anam, Aufa Anastasia Dian R Anindya Wirasatriya Antonius Budi Susanto Apriliani, Seka Indah Ardhan Khanza Adhirajasa Ariel E San Jose Arif Rahman Arumning T. Fauziah Aufa Anam Azizah T.N., Ria Bastiar, Yusuf Bifa Aulia Manuhuwa Bintang Septiarani Broto Wisnu RTD Broto, R. T.D Wisnu Candhika Yusuf Cantik Sitta Devayani Cantika Elistyowati Andanar CB. Ronaldi Chandra E Chrisna Adhi Suryono Chrisna Adi Suryono Cristiana Manullang David Nugroho Delianis Pringgenies Delianis Pringgenies Denny Nugroho Sugianto Dharma, Laga Adhi Diah Permata Wijayanti Diaz Adiyoga Dina Ayu Magfirani Dinda Richa Kumarahaqi Donna Nur&#039;Aurelya Mahardhika Dwi Haryanti, Dwi Dwi Saniscara Wati Edi Supriyo Edi Wibowo Edi Wibowo Kushartono Edi Wibowo Kushartono Edy Supriyo Edy Supriyo Edy Supriyo Edy Wibowo Edy Wibowo Elis Indrayanti Endika Meirawati Erik Wijaya Kusuma Ervia Yudiati Esti Rudiana Ety Parwati Ety Parwati Ety Parwati Fitriyan, Jodhi Kusumayudha Frijona Fabiola Lokollo Galih Arum Puspitaningtyas Aji Pangastuti Gangsar Bayu Setia Nugroho Gangsar Bayu Setia Nugroho Gazali Salim Ginzel, Fanny Iriany Gunawan Widi Santosa H. Endrawati Hadi Endrawati Hadi Endrawati Hani’atun Nurfajriyah Hariyadi Hariyadi Harmoko Harmoko Haryo Farras Raditya Hutama Hawa, Adnin Kamil Bani Heri Yanti Hermawan Hermawan Hermawan Hermawan Hermin Pancasakti Kusumaningrum Hilal M I Wayan Warmada Ibnu Pratikto Ibnu Pratikto Ika Desie Wulandari Ira Kolaya Ira Kolaya, Ira Ireng Sigit Atmanto Irwani Irwani Isai Yusidarta Isti Pudjihastuti Ita Riniatsih Ita Widowati Itsna Yuni H Jelita Rahma Hidayati Johannes Hutabarat Jufri Ubay Julian Ransangan Jumawan Jumawan Jussac Maulana Masjhoer Justin Cullen Jusup Suprijanto Jusup Suprijanto Jusup Suprijanto Käll, Sofia Ken Suwartimah Ken Suwartimah Khairunnisa Khairunnisa Khoerunnisa, Rizka Nabila Kholilah, Nenik Koen Praseno Koen Praseno Kusuma, Erik Wijaya Laras Kinanti Pinandita Lilik Maslukah M. Andry Herdiatma M. Andry Herdiatma Madhu Pinastika Puji Lestari Madhu Pinastika Puji Lestari, Madhu Pinastika Puji Magfirani, Dina Ayu Mahakar, Abdul Latif Mahfud Mahfud Manuhuwa, Bifa Aulia Mas’ad Arif Mayestika, Pingkan Meitri Bella Puspa Mostafa Imhmed Ighwerb Muchammad Miftahul Ulum Muchammad Miftahul Ulum Muhammad Faiz Abadi Muhammad Rafi Tsaqif Muhammad Yusuf Muhammad Zainuri Muhammad Zainuri Muhammad Zainuri Muhammad Zainuri Muji Wasis Indriyawan, Muji Wasis Mujiyanto Mujiyanto Mustalafin Mustalafin Mu’alimah Hudatwi Nando Arta Gusti Pamungkas Narendra Prasidya Wishnu Natasya Erdza Aulia Ningrum, Malinda Satya Nirwani Soenardjo Njurumana, Steven Nggiku Norma Afiati Nugroho, Suciadi Catur Nur Taufik SPJ Nur Taufiq Nur Taufiq-Spj Orisu, Anthon Apolos Parameswari Iccha Nirmalabuddhi Wishnuputri Petta, Constantein Philipus Uli Basa Hutabarat Pingkan Mayestika Pingkan Mayestika Pradina Purwati Pradina Purwati Pratama, Candrika Primaswatantri Permata Putri Novianingrum, Milka Putri, Dhiya Aflah Luswanto Putri, Ni Putu Purba Nava Vidyadhari Putriningtias, Andika Raden Ario Rafsanjani A. Karim Rafsanjani A. Karim Raka Pramulo Sophianto Ramadhani, Muhammad Rizqi Reny Yesiana Retno W. Astuti Ria Azizah Ria Azizah Ria Azizah Ria Azizah Ria Azizah Tri Nuraini Rizky Imtihan R. Rizky Imtihan R., Rizky Imtihan Robertus Triaji Mahendrajaya Robertus Triaji Mahendrajaya Robertus Triaji Mahendrajaya Robin Robin Rohmah, Ivatur Rotua Malau Rozi Rr. Dyah Artati Akbarinissa Rudhi Pribadi Rudi Pribadi Sarah Nabilla Sari Budi Moria Sartika, Linda Selvi Marcellia Septiani, Nur Alifah Seto Haryoardyantoro Sitti Hartinah DS Sophianto, Raka Pramulo Sri Redjeki Sri Redjeki Sri Redjeki Sri Sedjati Sri Yulina Wulandari Subagiyo Subagiyo Subagiyo Subagiyo Sugiyanto Sugiyanto Sugiyanto Sugiyanto, Nenden Rose Suryono Suryono Sutrisno Anggoro Tarigan, Ariyo Imanuel Taufiq-Spj, Nur Tiara Nur Baeti Baeti Tri Karyawati Tria Nidya Pratiwi Ubay, Jufri Ulfah Nurjanah Ulfah Nurjanah Ulfah Nurjanah, Ulfah Umi Fatimah Valentina R Iriani Valentina R. Iriani W.L. Saputra Wahyu Adi Wahyudi, Yudisthio Wibowo, Muhammad Reyhan Widianingsih Widianingsih Widianingsih Widianingsih Widianingsih Widianingsih, - Wilis Ari Setyati Wilis Ari Setyati Wishnuputri, Parameswari Iccha Nirmalabuddhi Wita Kristianty Sirait Yasir, Moh. Yoki Ristadi Yoko Nozawa Yosi Yananda Sijabat Yudho Prasetyo Yunita Anggarini, Yunita Zulfiandi Zulfiandi Zulfiandi Zulfiandi