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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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Kandungan Logam (Pb) pada Strombus canarium Linnaeus,1758 (Mollusca :Gastropoda) di Perairan Malang Rapat dan Tanjung Siambang Provinsi Kepulauan Riau Andi Bakia Askara; Fadhliyah Idris; Risandi Dwirama Putra; Aditya Hikmat Nugraha
Jurnal Kelautan Tropis Vol 23, No 3 (2020): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v23i3.7229

Abstract

Human activities in coastal areas have the potential to cause heavy metal pollution. The impact of heavy metal pollution causes the accumulation of heavy metals in the body of marine biota, including the Gonggong Snail (S. Canarium). This study aims to analyze the concentration of heavy metals Pb in Gonggong snails in two different characteristics of aquatic ecosystems. Purposive sampling used as a sampling method of Gonggong Snail. The Analysis of heavy metal concentrations from Pb using the ICP (Inductively coupled plasma). The results showed the heavy metal concentration of Pb was 0.427 mg/kg for Malang Rapat Village and 0.71 mg/kg for Tanjung Siambang village. The difference between the two locations possibly due to differences in the aquatic characteristics at the study site. Aktivitas manusia di kawasan pesisir berpotensi menyebabkan terjadinya pencemaran logam berat. Dampak dari pencemaran logam berat dapat menyebabkan terakumulasinya logam berat pada tubuh biota laut, salah satunya yaitu Siput Gonggong (S.Canarium). Penelitian ini bertujuan untuk menganalisis konsentrasi logam berat Pb pada Siput Gonggong yang terdapat pada dua ekosistem perairan yang memiliki karakteristik perairan berbeda. Pengambilan sampel siput gonggong dilakukan dengan cara purposive sampling. Analisis konsentrasi logam berat menggunakan bantuan alat ICP (Inductively coupled plasma). Hasil penelitian menunjukkan bahwa konsentrasi logam berat Pb sebesar 0,427 mg/kg untuk Desa Malang Rapat dan 0,71 mg/kg untuk desa Tanjung Siambang. Terjadi perbedaan antara kedua lokasi kemungkinan dikarnakan adanya perbedaan karakteristik perairan pada lokasi penelitian.
Cadangan Karbon pada Ekosistem Padang Lamun di Siantan Tengah Taman Wisata Perairan Kepulauan Anambas Muhammad Al Rizky Ratno Budiarto; Johan Iskandar; Tri Dewi Kusumaningrum Pribadi
Jurnal Kelautan Tropis Vol 24, No 1 (2021): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v24i1.9348

Abstract

Secara global, ekosistem lamun dianggap sebagai penyerap karbon sehingga dapat berkontribusi terhadap mitigasi perubahan iklim. Penelitian bertujuan untuk mengetahui komposisi jenis, biomassa dan cadangan karbon pada komunitas padang lamun di perairan Siantan Tengah Taman Wisata Perairan (TWP) Kepulauan Anambas. Penelitian dilaksanakan pada bulan Agustus 2019 s.d Januari 2020. Uji kandungan karbon dilakukan dengan metode Welkley and Black sedangkan untuk mendapatkan biomassa menggunakan metode gravimetrik. Hasil penelitian menunjukkan bahwa terdapat tiga jenis lamun, yaitu Enhalus acoroides, Thalassia hemprichii, dan Cymodocea rotundata. Nilai biomassa lamun berkisar antara 171,89 – 275,68 gbk/m2 dan nilai cadangan karbon berada pada kisaran 51,89 – 80,66 gC/m2. Padang lamun di Siantan Tengah memiliki luas 130,45 ha, sehingga total Cadangan karbon pada ekosistem padang lamun di perairan Siantan Tengah diperkirakan 95,88 ton C. Penelitian ini membuktikan adanya kandungan karbon pada biomassa lamun sehingga dapat disimpulkan bahwa padang lamun berperan sebagai penyerap karbon (carbon sink).  Globally, seagrass ecosystems are considered as carbon sink so that it can contribute to climate change mitigation. This research aims to determine the species composition, biomass, and carbon stock in seagrass communities in Siantan Tengah Marine Tourism Park of Anambas Islands. The research was conducted in Agustus 2019 – January 2020.  The carbon content test was carried out by the Walkley and Black method while to obtain biomass using the gravimetric method. The result od study showed that there are three species of seagrasses, namely Enhalus acoroides, Thalassia hemprichii, and Cymodocea rotundata. Seagrass biomass value range 171,89 – 275,68 gbk/m2 and seagrass carbon stock value range 51,89 – 80,66 gC/m2. The area of seagrass beds in Central Siantan is 130,45 ha so that the total carbon stock estimated reach 95,88 tons C. This research proves the presence of carbon in the biomass of seagrass beds, so it can be concluded that seagrass beds act as carbon sinks.
Kelimpahan Mikroplastik Pada Sedimen Ekosistem Terumbu di Taman Nasional Laut Karimunjawa Sakti Imam Muchlissin; Prastyo Abi Widyananto; Agus Sabdono; Ocky Karna Radjasa
Jurnal Kelautan Tropis Vol 24, No 1 (2021): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v24i1.9865

Abstract

Eleven billion microplastic particles are entangled in coral reef ecosystems in the Asia - Pacific Region. The presence of microplastics in coral reef ecosystems in Indonesia, especially in the Karimunjawa Marine National Park, was found as many as 22.7 and 12.8 particles / kilogram samples in two locations. The presence of microplastics in coral reef ecosystems allows threats to the health of coral reefs. Therefore, the importance of this study is to complement the data on the distribution of microplastics in the Karimunjawa Marine National Park as an initial step for conservation and mitigation of the impact of plastic/ microplastic pollution. Sampling using purposive sampling method. Sediment collection using SCUBA set and sediment grab at a depth of 3 - 5 meters. ± 1000 g of sediment was taken and stored in double zip lock plastic. The samples were then analyzed by microplastics in the Tropical Marine Biotechnology Laboratory, FPIK UNDIP. The results showed that the greatest abundance of microplastics was in the Karang Tengah area with the number of microplastics 96 particles / kilogram, and the farthest in the Ujung Gelam and Lego was 11 particles / kilogram. Research shows that the abundance of microplastics in areas with human activities such as tourism, ports, and boat routes has a high abundance compared to conservation areas or areas with little human activity. It is hoped that the available data from this type of research will be able to produce decisions on conservation measures in Karimunjawa Marine National Park.  Sebelas miliar partikel mikroplastik terjerat pada ekosistem terumbu karang di Kawasan Asia – Pasifik. Keberadaan mikroplastik pada ekosistem terumbu karang di Indonesia, khususnya di Taman Nasional Laut Karimunjawa, ditemukan sebanyak 22,7 dan 12,8  partikel/kilogram sampel di dua lokasi. Keberadaan mikroplastik di ekosistem terumbu karang memungkinkan adanya ancaman terhadap kesehatan terumbu karang. Oleh karena itu pentingnya penelitian ini untuk melengkapi data sebaran mikroplastik di Kawasan Taman Nasional Laut Karimunjawa sebagai langkah awal konservasi dan mitigasi dari dampak polusi plastik/mikroplastik. Pengambilan sampel menggunakan metode purposive sampling. Pengambilan sedimen menggunakan SCUBA set dan sediment grab pada kedalaman 3 – 5 meter. Sedimen diambil ± 1000 gr dan disimpan dalam plastik double zip lock. Sampel kemudian dianalisis mikroplastik di laboratorium Tropical Marine Biotechnology, FPIK UNDIP. Hasil menunjukkan bahwa kelimpahan mikroplastik terbesar pada daerah karang tengah dengan jumlah mikroplastik 96 partikel/kilogram, dan terkecil pada perairan ujung gelam dan lego yaitu sebanyak 11 partikel/kilogram. Penelitian menunjukkan bahwa kelimpahan mikroplastik didaerah dengan aktivitas manusia seperti pariwisata, pelabuhan, dan jalur kapal memiliki kelimpahan tinggi dibanding dengan daerah konservasi atau daerah dengan aktivitas manusia yang kecil. diharapkan dengan data yang tersedia dari penelitian sejenis ini, mampu menghasilkan keputusan terhadap langkah konservasi di Taman Nasional Laut Karimunjawa. 
Biology Reproduction and Dynamic of Gonads Maturity Blue Swimming Crabs (Portunus pelagicus) in Betahwalang Waters, Demak Sri Redjeki; Muhammad Zainuri; Ita Widowati; Abdul Ghofar; Elsa Lusia Agus; Mustagpirin Mustagpirin; Panji Ayodya
Jurnal Kelautan Tropis Vol 23, No 3 (2020): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v23i3.8977

Abstract

The waters of Betahwalang, Demak has quite potential fisheries resources. For the sustainability of crab resources, active management is necessary applied. Information on biology reproduction of crabs is required. The purpose of this research was to determine the biological aspects of sex ratio and the dynamics of the gonadal maturity level. This research was conducted on September-November 2018 in Betahwalang Waters. The method used in this study is a descriptive research method. Data were collected by determining gender, weight and width of the carapace, the level of gonadal maturity. The results from observations of crab landed with a total of 6,292 crabs showed a percentage of 37.30% males and 62.70% females with sex ratios in September (1: 1.70), October, (1: 1.46), and November (1: 1.98). The observation of gonadal maturity level in September (Level I 162 crabs, Level II 1425 crabs, Level III 607 crabs) in October (Level I 130 crabs, Level II 832 crabs, Level III 207 crabs), and in November (Level I 46 crabs, Level II 753 crabs, Level III 195 crabs). The results show that the average crab catch on Betahwalang waters is dominated by the gonad II maturity level reaching (> 70%) of the total female caught. The results of the gonad maturity level are influenced by weather and season factors where the trend of the gonad maturity level will drop in the rainy season or in November.    
Analisis Korelasi Kawasan Pengembangan Kendal Industrial Park Terhadap Ruang Terbuka Hijau Yudo Prasetyo; Nurhadi Bashit; Hanum Fadhil Baihaqi
Jurnal Kelautan Tropis Vol 24, No 1 (2021): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v24i1.10297

Abstract

The Industrial Park in Indonesia has increased in each province, especially in Central Java Province because it has a positive impact on prosperity, economic level and can open jobs. Kendal Industrial Park (KIP) is one of the Industrial Park in Central Java that is experiencing growth and is expected to attract investors to enter. KIP has its own charm in the form of integration with ports so that it can reduce land route logistics costs. KIP will have an impact on land use and improvement of the road network that occurs around the area. Land use in KIP needs to be monitored so as not to cause problems due to changes in land use in the form of a physical environment. Therefore, Green Open Space (RTH) is needed to reduce the physical impact of the environment and can also improve the comfort of the community around KIP. This study intends to analyze the growth of Green Open Spaces (RTH) as a supporter of the KIP environment at the stage of land clearing and development. The results showed changes in land use occurred from the original water body class by 72% to 68% because it turned into open land. This is due to KIP preparing land for industrial use and not yet doing much development. Based on this, land-use changes cause an increase in Land Surface Temperature (LST) in the KIP, but the RTH does not increase. RTH needs to be improved to provide comfort in KIP locations. This research is expected to provide benefits for local governments in making policies for the KIP. Kawasan Industri di Indonesia mengalami peningkatan di setiap provinsi khususnya di Provinsi Jawa Tengah karena berdampak positif terhadap kesejahteraan, tingkat ekonomi dan dapat membuka lapangan kerja. Kendal Industrial Park (KIP) merupakan salah satu Kawasan Industri di Jawa Tengah yang sedang mengalami pertumbuhan dan diharapkan dapat menarik investor untuk masuk. KIP memiliki daya tarik tersendiri berupa integrasi dengan pelabuhan sehingga dapat menekan biaya logistic jalur darat. KIP akan berdampak pada tutupan lahan dan peningkatan jaringan jalan yang terjadi di sekitar kawasan. Tutupan lahan di KIP perlu dimonitor agar tidak menimbulkan masalah akibat perubahan tutupan lahan berupa lingkungan fisik. Oleh karena itu, Ruang Terbuka Hijau (RTH) diperlukan untuk mengurangi dampak fisik lingkungan dan juga dapat meningkatkan kenyamanan masyarakat sekitar KIP. Penelitian ini bermaksud untuk menganalisis pertumbuhan Ruang Terbuka Hijau (RTH) sebagai pendukung lingkungan KIP pada tahap pembukaan dan pengembangan lahan. Hasil penelitian menunjukkan perubahan tutupan lahan terjadi dari kelas badan air semula sebesar 72% menjadi 68% karena berubah menjadi lahan terbuka. Hal ini disebabkan KIP menyiapkan lahan untuk keperluan industri dan belum banyak melakukan pembangunan. Berdasarkan hal tersebut, perubahan tutupan lahan menyebabkan peningkatan Suhu Permukaan Lahan (SPL) di KIP, namun RTH tidak meningkat. RTH perlu ditingkatkan untuk memberikan kenyamanan di lokasi KIP. Penelitian ini diharapkan dapat memberikan manfaat bagi pemerintah daerah dalam pengambilan kebijakan KIP.
Investigasi Arus Sejajar Pantai (Longshore Current) di Daerah Abrasi Bengkulu Utara Ashar Muda Lubis; Nia Veronica; Rio Saputra; Juhendi Sinaga; M. Hasanudin; Edi Kusmanto
Jurnal Kelautan Tropis Vol 23, No 3 (2020): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v23i3.8045

Abstract

The coastal area of Serangai Village is directly facing the open sea; as a result it is vulnerable to coastal abrasion. Longshore currents can accelerate the process of coastal abrasion. The study was aimed to determine the speed and direction of current as well as the existence of the longshore current at the Serangai. Field observation was conducted on 5-7 November 2018. The results showed that the frequency distribution of current at speed of 0-10 cm/s reached 69%, and at speed of 10-20 cm/s reached 25%. The highest speed of 20-30 cm/s has a frequency of 6 %. Moreover, the direction of the majority of ocean currents is to the southeast (120o-150o), showing that the current is more likely to be parallel to the shoreline called longshore current that can accelerate shoreline Serangai Village, Bengkulu. However, further research is needed to see variability of current associated with the season (monsoon). Wilayah pesisir Desa Serangai berhadapan langsung dengan laut lepas; sehingga rentan terhadap abrasi pantai. Arus sejajar pantai dapat mempercepat proses abrasi pantai. Penelitian bertujuan untuk mengetahui kecepatan dan arah arus serta keberadaan arus sejajar pantai di Serangai. Pengamatan lapangan dilakukan pada tanggal 5-7 November 2018. Hasil penelitian menunjukkan bahwa distribusi frekuensi arus pada kecepatan 0-10 cm/s mencapai 69%, dan pada kecepatan 10-20 cm/s mencapai 25%. Kecepatan tertinggi 20-30 cm/s memiliki frekuensi 6%. Selain itu, arah arus laut mayoritas ke arah tenggara (120o-150o), menunjukkan bahwa arus lebih cenderung sejajar dengan garis pantai yang disebut arus sejajar pantai yang dapat mempercepat garis pantai Desa Serangai, Bengkulu. Namun, penelitian lebih lanjut diperlukan untuk melihat variabilitas arus yang terkait dengan musim (monsun).
Karakteristik Pola Pertumbuhan dan Distribusi Ukuran Thunnus albacares, Bonnaterre, 1788 (Teleostei: Scombridae) yang Tertangkap dengan Pancing Ulur di Perairan Selatan Pulau Ambon Jacobus Bunga Paillin; Stany Rachel Siahainenia; Ruslan Husen Saban Tawari
Jurnal Kelautan Tropis Vol 24, No 1 (2021): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v24i1.8637

Abstract

Handline is a fishing tool that is always used by fishermen in Passo Village to catch tuna fish in the southern waters of Ambon Island. In carrying out tuna fishing activities, these fishermen use two hand lines at the same time operating together but differ in their operating techniques. This research was conducted to know the size distribution and growth pattern of yellowfin tuna caught by handline (PUT and PUH) in the southern waters of Ambon Island. From the results of this study, the total yellowfin tuna caught using the PUT handline was 323 individuals with an average class length of 117.23 cm, while the yellowfin tuna caught using the PUH handline was 159 with an average class length of 118.1 cm. The average total weight of yellowfin tuna caught by the PUT handline was 21.26 kg. The average total weight caught using the PUH handline was 21.94 kg. The growth pattern of yellowfin tuna as a whole is negative allometric, which means that the length growth is faster than the weight growth. Pancing ulur merupakan alat tangkap yang selalu dipakai oleh nelayan di Desa Passo untuk menangkap ikan tuna di perairan selatan Pulau Ambon. Dalam melakukan aktivitas penangkapan ikan tuna, nelayan tersebut menggunakan dua pancing ulur (hand line) sekaligus  diopresikan secara bersama-sama namun berbeda dalam teknik pengoprasiannya. Penelitian ini dilakukan dengan tujuan untuk mengetahui distribusi ukuran dan pola pertumbuhan ikan tuna madidihang yang tertangkap dengan  pancing ulur (PUT dan PUH) di perairan selatan Pulau Ambon. Dari hasil penelitian ini total ikan tuna madidihang yang tertangkap dengan PUT sebanyak 323 individu dengan rata-rata kelas ukuran panjang yang tertangkap yaitu 117.23 cm, sedangkan tuna madidihang yang tertangkap menggunakan PUH sebanyak 159 ekor dengan rata-rata kelas ukuran panjang 118.1 cm. Rata-rata berat total tuna madidihang yang tertangkap dengan PUT yaitu  21.26 kg. rata-rata berat total yang tertangkap dengan PUH yaitu 21.94 kg. Pola pertumbuhan ikan tuna madidihang secara keseluruhan bersifat allometrik negatif hal ini berarti pertumbuhan panjang lebih cepat pertumbuhan beratnya.
Distribusi Bahan Organik pada Sedimen Permukaan Teluk Kelabat, Pulau Bangka Mohammad Agung Nugraha; Mu’alimah Hudatwi
Jurnal Kelautan Tropis Vol 23, No 3 (2020): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v23i3.6703

Abstract

Transport of organic material in coastal areas plays an important role in the global biogeochemical cycle. The purpose of this study was to examine the distribution of organic material in sediments and to identify sources of organic material in the Kelabat Bay waters. TOC and TN sediments were analyzed by the Walkley Black and Kjeldahl method. The value of TOC, TN, and C/N ratio obtained in the Kelabat Bay waters sediments ranged from 0.04-7.25%, 0.04-0.14%, and 0.67-65.91. The distribution of TOC, TN, and C/N ratio in Kelabat Bay sediments shows that the value in the inner Kelabat Bay is higher than the outside. The source of organic material input in the inner Kelabat Bay comes mainly from terrestrial, while the outer Kelabat Bay mainly comes from aquatic. Transport bahan organik pada wilayah pesisir memainkan peran penting dalam siklus biogeokimia secara global. Tujuan penelitian ini untuk mengkaji distribusi bahan organik pada sedimen serta identifikasi sumber bahan organik perairan Teluk Kelabat. TOC dan TN sedimen dianalisis dengan metode Walkley Black dan Kjeldahl. Nilai TOC, TN, dan rasio C/N yang diperoleh pada sedimen perairan Teluk Kelabat berkisar antara 0,04-7,25%, 0,04-0,14%, dan 0,67-65,91. Distribusi TOC, TN, serta rasio C/N pada sedimen Teluk Kelabat memperlihatkan nilai pada Teluk Kelabat bagian dalam lebih tinggi dibandingkan bagian luar. Sumber masukan bahan organik pada Teluk Kelabat bagian dalam utamanya berasal dari terestrial, sedangkan Teluk Kelabat bagian luar utamanya berasal dari akuatik.
An Assessment of Cilacap Coast's Total Carbonate Sediment Content Mukti Trenggono; Roy Andreas; Amron Amron; Rizqi Rizaldi Hidayat; Hendrayana Hendrayana; Rr Diah Febri Astuti; Cristiana Manullang
Jurnal Kelautan Tropis Vol 24, No 1 (2021): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v24i1.8849

Abstract

Sediments are particles derived from the dismantling of rocks from the land and pieces of shell and remains of marine organisms that contain organic matter, included carbonate sediment. The total carbonate sediment content was influenced by many factors, such as sediment grain type. This study aimed to determine the carbonate content in sediments and to determine their relationship to the sediment grain characteristic on the Cilacap coast. The sediment's carbonate content used the titration method, while the sediment grain test used a dry filter. Statistical analysis was used to determine the sediment grain characteristic (mean, sorting, skewness, and kurtosis). The results showed that sediments' total carbonate content had a range of 1.93% - 6.23%, with an average of 4.21%. Sediments are dominated by fine sand with very well sorted, very platykurtic, and very fine skewed characteristics. The relationship between sediment grain characteristics and total sediment carbonate content showed a good correlation due to the sorting factor. Other parameters such as mean size and skewness have been shown a low correlation, whereas kurtosis has a shallow relationship with carbonate content.
Analisis Stok dan Tingkat Pemanfaatan Sumberdaya Ikan Lemadang (Coryphaena hippurus) Berdasarkan Data di Pelabuhan Perikanan Samudera Cilacap Cita Susila; Abdul Ghofar; Suradi Wijaya Saputra
Jurnal Kelautan Tropis Vol 23, No 3 (2020): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v23i3.8491

Abstract

Dolphinfish fish is one of the commodities of Indonesian waters, which is a bycatch of tuna fisheries. Lemadang fish are under considerable catching pressure and tend to increase, thus endangering their sustainability. The purpose of the study was to find out the length of first caught (Lc50%), growth parameters, mortality rate, MSY value, optimum trip (f) and lemadang fish exploitation rate. The data collected are fish length (cmFL), fish weight (kg), fish production, and fishing efforts. The data were collected once every 2 weeks during November 2019 until January 2020. The results of the study is the size of fish ranged from 41 – 125 cmFL and  length at first capture (Lc50%) 75 cmFL. The long-weight relationship analysis obtained equation W=0,0000378*L2,363 with negative allometric growth pattern. The growth equation von Bertalanffy obtained Lt = L∞(1-e-1.8(t+0,343)). The total mortality 8,54 year-1 the rate of exploitation amounted to 0,8 with the peak of recruitment in August. The estimated value of MSY of Dolphinfish was 121.570 kg/year with optimum effort of 571 trip/year. The estimated value of Dolphinfish sustainable potential is 121,570 kg/year, with optimum efforts of 571 trips/year. Dolphinfish production since 2011 has exceeded its maximum sustainable yield (MSY). Utilization of Dolphinfish fish resources has been overfishing, both based on analysis of analytical models and production surplus models. Ikan Lemadang merupakan salah satu komoditi dari perairan Indonesia, yang merupakan bycatch dari perikanan tuna. Ikan Lemadang mengalami tekanan penangkapan yang cukup tinggi dan cenderung meningkat, sehingga dapat membahayakan kelestariannya. Tujuan dari penelitian adalah mengetahui ukuran pertama kali tertangkap, parameter pertumbuhan, laju mortalitas, nilai MSY, trip (f) optimum, dan tingkat eksploitasi ikan Lemadang. Data yang dikumpulkan adalah panjang cagak ikan (cmFL) dan bobot ikan (kg), volume tangkapan dan upaya penangkapan (trip), produksi ikan dan trip penangkapan. Pengambilan data dilakukan 2(dua) minggu sekali selama bulan November 2019 hingga Januari 2020. Hasil penelitian diperoleh ukuran panjang ikan berkisar 41 – 125 cmFL, dan ukuran pertama kali tertangkap (Lc50%) 75 cmFL. Persamaan hubungan panjang-bobot didapatkan W=0,0000378*L2,363,dan sifat pertumbuhan alometrik negatif. Persamaan pertumbuhan von Bertalanffy ikan Lemadang didapatkan Lt = L¥ (1-e-1,8(t+0,343)). Puncak rekrutmen terjadi pada bulan Agustus. Laju mortalitas total (Z) adalah 8,54 per tahun, mortalitas penangkapan (F) = 6,81/tahun, dan tingkat eksploitasi (E=F/M) sebesar 0,8. Nilai dugaan potensi lestari ikan Lemadang sebesar 121.570 kg/tahun, dengan upaya optimum sebesar 571 trip/tahun. Produksi ikan Lemadang sejak tahun 2011 sudah melebihi tingkat produksi maksimum lestari (MSY)-nya. Pemanfaatan sumber daya ikan Lemadang sudah overfishing. baik berdasarkan analisis model analitik maupun model surplus produksi.

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