53 research outputs found
Short Communication: Population structure of mangrove crab Scylla oceanica in mangrove ecosystem of Tanjung Lesung, Banten, Indonesia
No full textPudiawati T, Patria MP. 2017. Short Communication: Population structure of mangrove crab Scylla oceanica in mangrove ecosystem of Tanjung Lesung, Banten, Indonesia. Biodiversitas 18: 813-817. The mangrove crab Scylla oceanica is one of the dominant crabs in the mangrove ecosystem at Tanjung Lesung Beach, Banten, Indonesia. The aim of the study was to determine the temporal distribution, carapace width-weight relationship and condition factors of S. oceanica. The crabs were collected by using traps for four months from August to November 2015. It was observed that the carapace was larger in male crabs (9.97 cm) than in female crabs (9.34 cm) and the average weight of the males (206.08 g) was higher than that of the females (183.83 g). b value of male (1.955) and female (2.123) crabs were significantly different (P < 0.05). Both of them have a negative allometric growth pattern. The result of the distribution analysis was a Morisita spread index Id of 1.5176; this indicates the crabs have clustered distribution patterns and their distribution was allegedly associated with the reproductive cycle.</jats:p
PERTUMBUHAN DAN SINTASAN CACING LAUT Nereis sp. (POLYCHAETA, ANNELIDA) YANG DIBERI JENIS PAKAN BERBEDA
No full textCacing laut sebagai pakan berkualitas tinggi sangat dibutuhkan dalam prosespematangan gonad dan pemijahan udang dan ikan. Namun informasi bahan pakan lokal alternatif untuk budidayanya masih terbatas. Tujuan penelitian ini adalah untuk mengetahui potensi beberapa bahan baku lokal sebagai alternatif pakan dalam budidaya cacing laut Nereis sp. Metode penelitian menggunakan metode eksperimental dengan random design. Rancangan percobaan menggunakan Rancangan Acak Lengkap (RAL) dengan 4 perlakuan dan 6 ulangan. Perlakuan yang diberikan pada pemeliharaan Nereis sp. dengan menggunakan perbedaan jenis pakan. Pakan yang digunakan terdiri atas 4 jenis: (A) tepung usus ayam broiler, (B) tepung kepala udang, (C) tepung darah ayam, dan (D) pakan komersial (kontrol). Hasil penelitian menunjukkan pertambahan bobot berkisar 0,31-1,01 g, dan laju pertumbuhan spesifik berkisar 0,73%-1,76 %/hari, serta tingkat sintasan berkisar 80,56%-92,22%. Hasil analisis varian terhadap pertumbuhan, laju pertumbuhan spesifik, dan sintasan berbeda nyata (anova P< 0,05). Perlakuan terbaik diperoleh pada pakan dari tepung usus ayam broiler. Jenis pakan yang lain juga mempunyai kualitas yang sama dengan pakan komersial. Dengan demikian tepung usus ayam, kepala udang, dan tepung darah dapat digunakan sebagai alternatif pakan dalam budidaya cacing laut selain pakan ikan komersial
The estimates spawning potential ratio of three dominant demersal fish species landed in Tegal, north coast of Central Java, Indonesia
No full textNugroho D, Patria MP, Supriatna J, Adrianto L. 2017. The estimates spawning potential ratio of three dominant demersal fish species landed in Tegal, north coast of Central Java, Indonesia. Biodiversitas 18: 844-849. Java Sea is one of the important marine waters for fisheries purpose in Indonesia. The rich diversity of marine fish has been exploited for decades. Among them, demersal fish resource was commercially targeted by coastal fishers. The sustainability of demersal fishery is a crucial concern given the substantial economic contribution and its significant dependence of small-scale fishers for their livelihoods. The fishing intensity is considerable growing and tends to become threats their habitats. Three dominant species (Priacanthus tayenus, Scolopsis taeniopterus and Upeneus sulphureus) were selected in this study. To evaluate the vulnerability of these species to their bio-exploitation level, the spawning potential ratio (SPR) approach were applied. The calculation based on estimated length of first capture (Lc) indicates that SPR those demersal species occurred at less than 20%. These values indicate that existing fishery can be categorized as nearly fully exploited. Across broad range of species, 40% SPR is generally accepted as a proxy for Maximum Sustainable Yield (MSY) for recruitment overfishing in less resilience fish population.</jats:p
Pola Pergerakan Perilaku Agonistik Lobster Air Tawar Cherax quadricarinatus (Von Martens, 1868)
No full textThis research on movement patterns of agonistic behavior in crayfish Cherax quadricarinatus was conducted at laboratory and used an aquarium size 25 cm x 10 cm x 15 cm. The patterns of agonistic behavior were recorded by using a CCD and digital camera. The recorded data were analyzed using The Adobe Premier computer program and using Jaccard similarity to solve the reciprocal movement patterns. Clustering based on the UPGMA (Unweighted Pair Group Method Average) indicated that the dissimilarity value was about 0,98 and the moving pattern of the agonistic behaviors were grouped into five groups, namely: 1) threatening; 2) arranging the strategy; 3) testing the enemies capability; 4) fighting; 5) avoiding and defending
Zooplankton communities in the Krenceng Reservoair, Cilegon, Banten
No full textThis research was carried out to know the structure of zooplankton communities and relations between the phytoplankton and zooplankton in the Krenceng Reservoair, Cilegon. The zooplankton abundance with used Sedwigck Rafter Counting Method, diversity and evenness were counted. Relations between zooplankton and the environmental factors as well as its relations to phytoplankton calculated with regression. The results showed that are 13 species of the zooplankton found which including in three classes with the highest abundance on Novembers 2002 and March 2003 of the Rotifera. The analysis of regression pointed out that the environmental factors such: pH, BOD5, nitrate, CO2 and abundance of phytoplankton influence the abundance zooplankton in November. While in March, the abundance of zooplankton is influenced by brigthtness, nitrate, orthophosphates and C organic. The abundance of phytoplankton influenced positively by the abundance of zooplankton
KOMUNITAS ZOOPLANKTON DI PERAIRAN WADUK KRENCENG, CILEGON, BANTEN
No full textZooplankton communities in the Krenceng Reservoair, Cilegon, Banten. This research was carried out to know the structure of zooplankton communities and relations between the phytoplankton and zooplankton in the Krenceng Reservoair, Cilegon. The zooplankton abundance with used Sedwigck Rafter Counting Method, diversity and evenness were counted. Relations between zooplankton and the environmental factors as well as its relations to phytoplankton calculated with regression. The results showed that are 13 species of the zooplankton found which including in three classes with the highest abundance on Novembers 2002 and March 2003 of the Rotifera. The analysis of regression pointed out that the environmental factors such: pH, BOD5, nitrate, CO2 and abundance of phytoplankton influence the abundance zooplankton in November. While in March, the abundance of zooplankton is influenced by brigthtness, nitrate, orthophosphates and C organic. The abundance of phytoplankton influenced positively by the abundance of zooplankto
PERAN SIPUT TEREBRALIA (Gastropoda: Potamididae) DALAM MENGURAI DAUN MANGROVE RHIZOPORA DI PULAU PANJANG, SERANG-BANTEN
No full textPenelitian mengenai peran siput Terebralia dalam mengurai daun mangrove telah dilakukan pada bulan November hingga Desember 2013 di Pulau Panjang, Banten. Dalam penelitian ini, aktivitas penguraian daun dilakukan pada mangrove yang didominasi oleh Rhizopora sp. Lokasi penelitian terletak di bagian intertidal yang merupakan bagian mangrove yang terkena pasang surut air laut. Penelitian yang dilakukan hanya menggunakan Terebralia dewasa yaitu, Terebralia palustris > 5 cmdan Terebralia sulcata > 3 cm. Rata-rata persentase penguraian daun oleh T. palustris adalah sebesar 3,48% ± 0,18 /hari untuk R. apiculata dan 8,28% ± 0,13/hari untuk R. stylosa, sedangkanT. sulcata mengurai daun rata-rata sebesar 4,07% ± 0,12/hari untuk R. apiculata dan 4,93 % ± 0,15 /hari untuk R. stylosa. Hasil penelitian juga menunjukkan bahwa tidak ditemukan korelasi (P= 0,985; P= 0,875) antara panjang dan berat T.palustris dengan persentase penguraiannya. Begitu pula dengan T.sulcata, tidak ditemukan korelasi antara berat dengan laju penguraiannya. Sebaliknya, terdapat korelasi antara panjang dengan persentase penguraiannya (P = 0,016)
Spesies Udang Ketak Darat Thalassina (Latreille, 1806) (Decapoda: Thalassinidae) Di Kabupaten Tanjung Jabung Barat, Jambi
No full textPenelitian ini bertujuan untuk mengidentifikasi spesies udang ketak darat (mud lobster) Thalassina di Kabupaten Tanjung Jabung Barat, Jambi. Hasil penelitian menunjukkan bahwa spesies dari Thalassina yang ditemukan adalahThalassina anomala (Herbst 1804). Adapun bagian-bagian morfologi yang dijadikan sebagai pembeda antar spesies dari Thalassina dan menjadi ciri morfologi Thalassina anomala sebagai berikut: 1). Memiliki rostrum triangular, membulat dan bergerigi di sepanjang sisi lateralnya; 2). Tonjolan dorsomedian pada karapas memanjang hingga mencapai bagian dorsal dari abdominal somite pertama; 3). Abdominal sternite pada pleopod ke 2-5 memiliki tonjolan yang berada di tengah (median line); 4). Pereopod I memiliki 13-20 gerigi di sisi dalam dari propodal dan di sepanjang sisi lateral dari propodus; 5). Khusus pada jantan, petasma tanpa spina proksimal dan ujung bulat melebar tanpa setae. Ditemukan T. anomala di wilayah tersebut karena spesies ini memiliki penyebaran yang paling luas dibandingkan dengan Thalassina lainnya
Microplastic in Gonggong snails (Laevistrombus turturella) and sediment of Bintan Island, Kepulauan Riau Province, Indonesia
No full textRED SNAPPER (Lutjanus spp.) RESOURCES MANAGEMENT IN NORTHERN WATERS OF CIREBON, JAVA SEA
No full textRed snapper (Lutjanus spp.) is one of the important commodity of demersal fish at the northern waters of Cirebon, Java Sea. The high degree of traditional fishing operations around the coastal area is expected to affect the availability of the fish stock. The Research results showed that there have been over fishing, it is caused by the large number of traditional fishing vessels at the coastal area, especially the persistence of the fishermen who use unfriendly fishing gear such as mini trawl. And then the red snapper which caught generally is young and never spawn or not yet mature. To solve that problem, it must arrange the amount of fishing vessels which can be operated at coastal area and it must law enforcement, and then to utilize the red snapper resources it advised to use the hook size larger than No. 10 and then install the rumpon at the new fishing ground which wider and farther. So the pressure to fishing ground of snapper can be reduced.</p
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