<p>ABSTRACT<br />Savalai hairtailis one of demersal fish that landed in PPP Labuan Banten with a fishing ground from the Sunda Strait waters. Savalaihairtail fish were caught by many gears (multigear) such as trawl, purse seine, small bottom trawl, and gillnet. This research aimed at reviewing population dynamic of savalai hairtail in Sunda Strait waters. The results showed the value of the growth coefficient (k) for female and male were 0,30/month and 0,23/month respectively, with asimptotic length (L∞) 710,41 mm for females and 856,52 mm for males. First length capture for females and males were 460,46 mm and 454,66 mm respectively. First length of maturity for female and male fish were 567,24 mm and 599,73 mm respectively. Natural mortality (M) for the female and male fish were 0,27/year and 0,22/year respectively. Total mortality (Z) for the female and male fish were 1,25/year and 1,60/year respectively. Based on the relationship between the values of M and Z, then the arrest of mortality (F) known for female and male fish were 0,97/years and 1,38/year respectively. The rate of exploitation for female and male fish were72% and 83% respectively. Based on the current rate exploitation, savalaihairtail fish exploitation has exceeded optimum exploited level (50%), so it indicated the savalaihairtail was overfishing. The value of Lc was smaller than Lm indicated savalaihairtail experienced growth overfishing.<br /><br />Keywords: growth overfishing, overfishing, savalai hairtail, Sunda Strait<br />-------</p><p>ABSTRAK<br /><br />Ikan layur merupakan salah satu ikan demersal yang didaratkan di PPP Labuan Banten dengan fishing ground dari perairan Selat Sunda. Ikan layur ditangkap dengan banyak alat tangkap diantaranya alat tangkap payang, pukat cincin, pukat pantai, jaring arad, dan jaring insang. Tujuan dari penelitian ini adalah mengkaji dinamika populasi sumber daya ikan layur (Lepturachantus savala) di Perairan Selat Sunda. Hasil penelitian menunjukkan nilai keofisien pertumbuhan (k) ikan betina dan jantan berturut-turut 0,30/bulan dan 0,23/bulan, dengan panjang asimptotik (L∞) 710,41 mm dan 856,52 mm. Panjang ikan pertama kali tertangka (Lc) untuk betina dan jantan berturut-turut sebesar 460,46 mm dan 454,66 cm. Panjang ikan layur pertama kali matang gonad (Lm) untuk betina sebesar 567,24 mm dan jantan sebesar 599,73 mm. Laju mortalitas alami (M)) untuk ikan betina sebesar 0,27/tahun dan ikan jantan sebesar 0,22/tahun. Mortalitas total (Z) untuk ikan betina sebesar 1,25/tahun dan ikan jantan sebesar 1,60/tahun. Berdasarkan hubungan antara nilai M dan Z, maka mortalitas penangkapan (F) diketahui untuk betina sebesar 0,97/tahun dan jantan sebesar 1.38/tahun. Laju ekploitasi ikan layur betina dan jantan berturut-turut sebesar 72% dan 83%. Berdasarkan nilai laju eksploitasi, pemanfaatan ikan layur telah melebihi pemanfaatan optimal (50%), sehingga di indikasikan mengalami tangkap lebih. Nilai Lc&lt;Lm menunjukkan tangkap lebih yang terjadi adalah growth overfishing.<br /><br />Kata kunci: growth overfishing, tangkap lebih, ikan layur, Selat Sunda</p>

<p align="center"><strong><em>ABSTRACT</em></strong><strong><em></em></strong></p><p class="Abstractisi">Groupers are important fisheries resources in the tropic and sub-tropic due to it has high economic value, so that continuously exploitation even in some waters have collapsed and high capture pressureThe study aimed to identify population parameters of coral grouper (Plectropomus sp.) in Karimunjawa waters as basic information for fisheries management. Sampling method using fish landing observation method for fish catches in 14 days every month since 2010-2015 caught in Karimunjawa waters. Growth parameters, mortality, length at first capture, and recruitment pattern analysis using the Rstudio, FiSAT II and spawning potential ratio with LB-SPR analysis. The growth rate is relatively slow with k values ranging from 0.10 to 0.13 and lifespan of 21.93-27.73 years. The stock condition of the coral grouper species of P. leopardus, P. maculatus, and P. Oligacanthus was indicated overfished with E&gt; 0.5 and SPR of 0.14, 0.22, and 0.25. These indicate that the 3 species of Plectropomus sp. in Karimunjawa is at unsustainable levels. Coral grouper type P. areolatus has E=0.45 and SPR=0.52, meaning that this type of grouper has a low exploitation rate and high spawning potential compared to other species coral grouper in Karimunjawa waters.</p><p class="TubuhTulisanAll"><strong><em>Keywords:</em></strong><strong><em> </em></strong><em>coral grouper, fisheries, Karimunjawa waters, stock status</em><strong></strong></p><p class="TubuhTulisanAll" align="center"><strong>ABSTRAK</strong></p><p class="Abstrakisi">Ikan kerapu adalah sumber perikanan penting di daerah tropis dan sub-tropis karena bernilai ekonomis tinggi, sehingga terus dilakukan eksploitasi bahkan beberapa perairan telah mengalami collapse dan tekanan penangkapan yang tinggi. Penelitian ini bertujuan mengidentifikasi parameter-parameter populasi ikan kerapu sunu (Plectropomus sp.) di perairan Karimunjawa sebagai informasi dasar dalam pengelolaan perikanan. Metode pengambilan data menggunakan metode observasi (pengamatan) terhadap hasil tangkapan ikan selama 14 hari dalam satu bulan dari tahun 2010-2015 yang ditangkap di Perairan Karimunjawa. Analisis parameter pertumbuhan, mortalitas, length first capture, dan recruitment pattern menggunakan program Rstudio, FiSAT II dan rasio potensi pemijahan dengan analisis LB-SPR. Laju pertumbuhan tergolong lambat dengan nilai k berkisar 0,10-0,13 dan lifespan 21,93-27,73 tahun. Kondisi stok ikan kerapu sunu jenis <em>P. leopardus</em>, <em>P. maculatus</em>, dan <em>P. oligacanthus</em> diindikasikan mengalami kondisi tangkap lebih dengan E &gt; 0,5 dan SPR sebesar 0,14, 0,22, dan 0,25. Hal ini menunjukkan bahwa penangkapan saat ini untuk 3 spesies kerapu sunu di Karimunjawa berada pada tingkat yang tidak berkelanjutan. Kerapu sunu jenis <em>P. areolatus</em> memiliki E sebesar 0,45 dan SPR 0,52, artinya kerapu jenis ini memiliki tingkat eksploitasi yang rendah dan potensi pemijahan yang tinggi dibandingkan jenis kerapu sunu lainnya di Perairan Karimunjawa.</p><strong>Kata kunci: </strong>kerapu sunu, perikanan, Perairan Karimunjawa, status stok

Leopard coral grouper (Plectropomus leopardus) is an important fisheries commodity in Saleh Bay, both ecologically and economically. Continuous exploitation of this species has caused population collapses in some waters due to high fishing pressure. Therefore, it is very important to estimate its population stock. Yield per recruit models usually being used to evaluate population stock also to estimate biological reference point. We estimated life-history parameters using length-based stock assessment, while stock size was estimated by virtual population analysis (VPA), and finally, prediction models was estimated using Beverton & Holt’s yield per recruit model. We used the following variables: growth parameters, fishing mortality, length at first capture, and age at 50% recruitment into the fishery. From these variables we found that the Fcurrent (0.26) is higher than the target reference point (FMSY= 0.24), which confirmed the indication of slight increased exploitation rate (E=0.62). It is shown that the Plectropomus leopardus was overexploited with spawner biomass-per-recruit at 20.6% of pristine levels. The regulation measures to correct the exploitation pattern and to reduce fishing mortality smaller than Fmsy including limiting the catch size and control on fishing gear by limiting fishing effort.

Information on the fishing ground location and effective effort plays important roles in fishery management. Using this information, we could conduct the analysis of fishery spatial management and effort standardization. A global positioning system (GPS) tracker and a GPS logger have been well developed and allow a wide range of applications in many sectors because the sensors and logger have become more affordable with good resolution and high accuracy. In this study, we intend to use the GPS tracker in capture fishery application to obtain details about the fishing ground location and as an effective method for artisanal grouper fishery. Eight GPS tracers were installed on 10 boats for grouper fishery in Saleh Bay, West Nusa Tenggara Province, Indonesia. On the basis of the GPS position, we could plot their fishing ground and also measure the distance for each trip and the time required for each fishing operation. Results of this study showed that the fishing grounds of grouper fishing boats were 5-10 nautical miles from the fishing landing port and mostly at the western part of Saleh Bay. In general, speargun and hook and line (troll line and handline) fishers had different fishing grounds, where speargun fishers tend to fish within a marine protected area (MPA) and hook and line fishers tend to fish in the southern (outside) part of the MPA. From the results of this study, a similar analysis method could be utilized in Banyuwangi sardine fishery for the science and technology research partnership for sustainable developments project (SATREPS).

Nusa Penida adalah kawasan konservasi perairan (KKp) yang memiliki keragaman jenis ikan yang tinggi. Penangkapan ikan target oleh nelayan perlu diatur dan dikelola dengan baik untuk menghindari tangkap lebih. Tujuan penelitian adalah menilai pengelolaan perikanan ikan tongkol lisong (Auxis rochei) yang sudah diterapkan di Nusa Penida menggunakan indikator Ecosystem Approach for Fisheries Management (EAFM). Penelitian dilakukan di perairan Nusa Penida, Provinsi Bali, pada Juli-Desember 2018. Pengumpulan data meliputi data ekologi (panjang dan bobot ikan, serta kualitas air) melalui survei terhadap hasil tangkapan dan perairan; data sosial-kelembagaan melalui kuesioner kepada 54 responden nelayan (jaring hanyut, jaring insang, pancing) dan wawancara dengan para pemangku kepentingan. Analisis data dilakukan secara deskriptif sesuai dengan domain dan indikator pada EAFM. Hasil penelitian menunjukkan bahwa ikan tongkol lisong mempunyai panjang rata-rata 24,59 cm dengan kisaran panjang (21-34) cm, lebih kecil daripada yang tercatat pada FishBase yaitu 35-50 cm. Nilai spawning potential ratio adalah 23% yang mengindikasikan overfished. Kualitas air sesuai dengan baku mutu perairan untuk biota laut. Penerapan kearifan tradisional yaitu Nyepi Segara ditaati oleh masyarakat lokal sebagai upaya untuk menjaga kelestarian sumber daya ikan (SDI). Penilaian pengelolaan perikanan tongkol lisong menggunakan indikator EAFM menyimpulkan bahwa pada domain SDI terjadi indikasi overfished. Domain habitat (kualitas air dan tutupan karang) dalam kondisi baik. Domain sosial dan ekonomi dalam kondisi baik, kecuali pendapatan responden (54%) kurang dari Rp1.500.000,00.