Community Structure and Spatial Distribution of Fish Juvenile in Mangrove and Seagrass Habitats in Pramuka Island

This study was aimed to investigate the community structure of fish juvenile, spatial distribution and similarity from both adjacent habitats of mangrove and seagrass. This study was conducted in the eastern part of Pramuka island from April to June 2015. The samples were collected by using line transect method in three observation areas that were spatially connected i.e., mangrove, transition and seagrass zones. The result of the study from three observation zones revealed that there were found 24 species of fishes from 15 families i.e., Siganidae (4 species), Apogonidae (3 species), Ger-reidae (2 species), Terapontidae (2 species), Gobiidae (2 species), Labridae (2 species), Mugilidae, Nemipteridae, Hemiramphidae, Sphyraenidae, Monacanthidae, Atherinidae, Pomacentridae, Lut-janidae, and Lethrinidae (each of them 1 species). According to community structure, the adjacent ob-servation zones did not show a significant difference in the number of species, abundance, and bio-mass. According to fish distribution, fish species in transition zone and seagrass zone were relatively similar and dominated by Gerres oblongus, Fibramia lateralis, and Siganus canaliculatus. Mean-while, in mangrove zone revealed a significant different of fish species than in transition and seagrass zones. In mangrove zone, fish species was dominated by Gerres oblongus and Siganus guttatus

Sistem Bagi Hasil pada USAha Penangkapan Madidihang Skala Kecil di Kabupaten Seram Bagian Barat

Penelitian ini bertujuan untuk 1) mengevaluasi sistem bagi hasil yang berlaku di Kabupaten Seram Bagian Barat berdasarkan aspek proporsional, berkeadilan, berkeuntungan, dan berkelanjutan; 2) mensimulasikan alternatif pola bagi hasil dengan mempertimbangkan kebutuhan minimum nelayan dan pemilik; serta 3) menentukan pola bagi hasil yang ideal bagi kedua belah pihak. Metode analisis yang digunakan adalah analisis profit, analisis upah minimum provinsi (UMP), analisis break event point (BEP), serta simulasi. Hasil penelitian menunjukan bahwa: 1) pola bagi hasil yang berlaku di lokasi studi belum memenuhi aspek bagi hasil yang proporsional, berkeadilan, berkeuntungan dan berkelanjutan 2) pendapatan nelayan berdasarkan pola bagi hasil yang berlaku masih berada di bawah UMP ideal, 3 )sistem bagi hasil yang ideal adalah dengan pola 52:48, dimana pemilik mendapatkan bagian 52 persen dan nelayan memperoleh 48 persen dari hasil tangkapan bersih

Kebiasaan Makan Hiu Kejen (Carcharinus Falciformis): Studi Kasus Pendaratan Hiu Di Ppp Muncar Jawa Timur (Feeding Habit of Silky Shark (Carcharinus Falciformis): Case Study of Landing Shark in Muncar Coastal Fishing Port East Java)

Indonesia is the biggest country which produced shark in the world. Muncar Coastal Fishing Port, Banyuwangi, is a shark fishing center in East Java. Caught sharks were dominated by silky shark (Carcharinus falciformis). Primary data collected by in situ sampling and stomach content analysis. Stomach content was collected by sectio. It preserved by 10% formaline in coolbox. Silky shark had caught by shark long line and gillnet. Shark is the fish target of longline and by-catch of gillnet. Silky shark preys were grouper fish (Epinephelus sp.) as main prey and squid (Loligo sp.), beltfish (Trichiurus lepturus), sardine (Sardinella lemuru) as complementary preys. Based on stomach content analysis, silky shark was identified on 4.7 trophic level. Silky shark preys were grouper on trophic level 4.1, squid, beltfish on trophic level 4.4, sardine on trophic level 2.1. Silky shark as apex predator could be found in Bali Strait and Makassar Strait, which it classified as fertility water. The existence of silky sharks whicht prey fish in several trophic level layers made silky shark as one of the key species in Bali Strait and Makassar Strait. Catching sharks will have implications for trophic level is high or low

Fish Behavior on Fisheries Boat Lift Net (Bagan Petepete) by Using Led Lights

Research on fish behavior in boat lift net fisheries (bagan petepete) equipped with LED light is very important since the similar research is very limited conducted in Indonesian waters. The purpose of this study was to understand the LED light distribution and its impact on the fish behavior around the LED light. This study was conducted in the laboratory of Simulation Workshop and Navigation, Pangkep State Polytechnique of Agricultural and fishing experiment was done in Barru District waters, Makassar Strait, South Sulawesi. The light intensity was measured by a digital lux meter and under water lux meter, while fish behavior was observed by side scan sonar color. Light intensity analyses showed that the distribution of 80 watts LED light was mostly focused with 1096 lux with an angle168°. Fishes approached the light at 5-10 m and 20-30 m water depth from all directions after all lights were turned on. Fishes in smaller groups and higher density concentrated around the light when only one lamp was turned on. After catch processing, some fishes left the lighting area and others still stayed in the lighting area

Dinamika Perikanan Kerapu Di Taman Nasional Karimunjawa (Grouper Fishery Dynamics in Karimunjawa National Park)

Karimunjawa National Park is one of the national parks that have the objective to maintain fish populations in the Java Sea, where one of them is grouper. Grouper is one of the target fish in the national park. The objective of this study is to assess the conditions and dynamics of the grouper fishery in Karimunjawa National Park. Fish landing surveys were conducted to collect the data. Fishing gear types, grouper species, and weight of each species were collected. Calculation of Catch per Unit Effort (CPUE) per month and two-way ANOVA statistical tests were used for data analysis. Results of this study indicated that catches of grouper using speargun was significantly higher than the catch using handline. There was a seasonal cycle of the grouper catch, where the value of the highest CPUE occurred in transitional season between the west and east monsoon season, from March to May

KEBIASAAN MAKAN HIU KEJEN (Carcharinus falciformis): STUDI KASUS PENDARATAN HIU DI PPP MUNCAR JAWA TIMUR (Feeding habit of Silky Shark (Carcharinus falciformis): Case Study of Landing Shark in Muncar Coastal Fishing Port East Java)

ABSTRACTIndonesia is the biggest country which produced shark in the world. Muncar Coastal Fishing Port, Banyuwangi, is a shark fishing center in East Java. Caught sharks were dominated by silky shark (Carcharinus falciformis). Primary data collected by in situ sampling and stomach content analysis. Stomach content was collected by sectio. It preserved by 10% formaline in coolbox. Silky shark had caught by shark long line and gillnet. Shark is the fish target of longline and by-catch of gillnet. Silky shark preys were grouper fish (Epinephelus sp.) as main prey and squid (Loligo sp.), beltfish (Trichiurus lepturus), sardine (Sardinella lemuru) as complementary preys. Based on stomach content analysis, silky shark was identified on 4.7 trophic level. Silky shark preys were grouper on trophic level 4.1, squid, beltfish on trophic level 4.4, sardine on trophic level 2.1. Silky shark as apex predator could be found in Bali Strait and Makassar Strait, which it classified as fertility water. The existence of silky sharks whicht prey fish in several trophic level layers made silky shark as one of the key species in Bali Strait and Makassar Strait. Catching sharks will have implications for trophic level is high or low.Keywords: feeding habit, silky shark, trophic level-------ABSTRAKIndonesia merupakan negara penghasil hiu terbesar di dunia. PPP Muncar, Banyuwangi merupakan salah satu pusat penangkapan hiu di Jawa Timur. Hiu yang tertangkap oleh nelayan didominasi oleh hiu kejen (Carcharinus falciformis). Data primer didapatkan dari pengambilan sampel dan analisis isi lambung. Isi lambung didapatkan dari proses pembedahan. Isi lambung diawetkan dalam formalin 10% dalam coolbox. Hiu kejen tertangkap menggunakan rawai dan gillnet. Hiu menjadi ikan target pada alat tangkap rawai dan by-catch pada gillnet. Mangsa hiu kejen adalah kerapu sebagai makanan utama dan lemuru, cumi-cumi, layur merupakan makanan pelengkap. Hiu kejen (C.falciformis) yang tertangkap di Selat Bali berada pada trofik level 4,7. Mangsa utama hiu kejen adalah kerapu (trofik level 4,1) dan mangsa pelengkap lemuru (trofik level 2,1), layur (trofik level 4,4) dan cumi-cumi. Hiu kejen sebagai salah satu apex predator dapat ditemukan di Selat Bali maupun Selat Makassar yang memiliki kesuburan tinggi. Keberadaan hiu kejen yang memangsa beberapa ikan di beberapa lapisan trofik level menjadikan hiu kejen sebagai salah satu spesies kunci di perairan Selat Bali dan Selat Makassar. Penangkapan hiu akan memberi implikasi terhadap trofik level yang tinggi maupun rendah.Kata kunci: kebiasaan makan, hiu kejen, trofik leve