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Danu Wijaya

Balai Penelitian Pemulihan dan Konservasi Sumber Daya Ikan

Author-ID : 3193632

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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STRUKTUR KOMUNITAS IKAN INTRODUKSI DI DANAU BATUR, BALI Agus Arifin Sentosa; Danu Wijaya
BERITA BIOLOGI Vol 11, No 3 (2012)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v11i3.503

Lake Batur is the largest lake in Bali island, however information on introduced fish community is not available yet. The research aimed to identify the community structure and ecological status of the introduced fish in Lake Batur, Bali. The study was carried out on May, July and October 2011 using survey method. The fishes were obtained using experimental gill nets and by fishermen. Data analysis included index of diversity, evenness, dominance, species richness and the abc (abundance-biomass comparison) curve. The results showed the tilapia (Oreochromis niloticus) was the dominant species. The status of introduced fish community suggested to ecological stress but it was relatively undisturbed.

EFEKTIVITAS PENGGUNAAN BERBAGAI JENIS TAG UNTUK MENGETAHUI KELANGSUNGAN HIDUP LOBSTER PASIR (Panulirus homarus Linnaeus, 1758) Danu Wijaya; Fayakun Satria; Endi Setiadi Kartamiharja
Jurnal Penelitian Perikanan Indonesia Vol 22, No 3 (2016): (September) 2016
Publisher : Pusat Riset Perikanan, BRSDM KP.

Lobster pasir (Panulirus homarus) merupakan salah satu jenis lobster yang memiliki nilai ekonomis penting dan banyak ditangkap di Indonesia. Salah satu cara untuk mengetahui pertumbuhan, tingkat kelangsungan hidup dan pergerakan lobster di alam adalah dengan menggunakan metode Capture-mark-recapture (CMR). Tiga jenis tag yang biasa dipakai untuk penandaan lobster adalah T-bar, streamer, dan Visual Implant Elastomer (VIE). Percobaan penandaan dilakukan di kolam penampungan di Teluk Gerupuk, Lombok Tengah. Penelitian ini bertujuan untuk mendapatkan jenis tag yang efektif untuk mengetahui tingkat kelangsungan hidup pada lobster pasir. Penelitian dilakukan dengan menggunakan tiga jenis tag, yaitu T-bar (70 ekor), streamer (76 ekor), dan Visual Implant Elastomer (VIE) (10 ekor) pada dua kelompok ukuran lobster (>20-60 gram dan >60-100 gram). Semua sampel dipelihara dalam bak selama 30 hari yang dilakukan Agustus-September 2015. Hasil penelitian menunjukkan bahwa VIE (60%) memiliki tingkat kelangsungan hidup tertinggi diikuti oleh T-bar (34 %) dan steamer (13 %). Untuk keperluan monitoring di alam, disarankan menggunakan T-bar karena penerapannya praktis dan mudah dideteksi. Panulirus homarus (Spiny Lobster) is one of the lobster species that has an important economic value and highly catched in Indonesia. Capture-mark-recapture (CMR) methods are widely used to study the estimation of population parameters such as abundance, growth, distribution and survival of the wild organism. Three effective techniques commonly used for decapods tagging are T-bar, streamer, and Visual Implant Elastomer (VIE). Tagging experiments conducted in ponds in the Gulf Gerupuk, Central Lombok. This study aims to determine the effective type of tags and to determine the survival rate of spiny lobster. The study was conducted using three types of tags, T-bar (70 lobsters), streamer (76 lobsters), and Visual Implant Elastomer (VIE) (10 lobsters) divided in two groups size of lobster (> 20-60 grams and> 60- 100 grams). All samples were maintained in the tank for 30 days in August-September, 2015. The results showed that VIE (60%) has the highest survival rate followed by the T-bar (34%) and streamer (13%). For monitoring purposes in nature T-bar are advised to use because of their more practical applicated and easily detected.

PERCOBAAN PENANDAAN LOBSTER PASIR (Panulirus homarus Linnaeus, 1758) DI TELUK PRIGI Danu Wijaya; Amula Nurfiarini
Jurnal Penelitian Perikanan Indonesia Vol 24, No 4 (2018): (Desember) 2018
Publisher : Pusat Riset Perikanan, BRSDM KP.

Percobaan penebaran lobster pasir (Panulirus homarus) di Perairan Teluk Prigi, Kabupaten Trenggalek dilakukan pada 2015. Percobaan dilakukan dengan cara memberi tanda (tag) pada seluruh sampel lobster pasir yang ditebar, dikenal sebagai metode Capture-mark-recapture (CMR) dan sudah banyak digunakan untuk mempelajari populasi biota di alam. Penelitian bertujuan untuk mengetahui tingkat tertangkap kembali, laju pertumbuhan, dan pergerakan lobster pasir bertanda di Teluk Prigi. Penebaran lobster pasir bertanda dilakukan pada tiga lokasi yaitu Damas, Karanggongso dan Karangasem dengan jumlah 2.784 ekor dan diberi tanda jenis T-bar berwarna merah yang memiliki kode. Pengamatan lobster pasir bertanda yang tertangkap kembali dilakukan sepanjang tahun 2016 di Teluk Prigi (Februari-Desember). Tingkat tertangkap kembali lobster bertanda dihitung menggunakan proporsi antara lobster bertanda yang tertangkap dengan lobster bertanda yang ditebar. Laju pertumbuhan lobster bertanda yang tertangkap kembali dihitung berdasarkan pertumbuhan per satuan waktu yang sama dengan perubahan panjang dibagi dengan perubahan umur. Pergerakan lobster bertanda diukur melalui jarak dari lokasi tebar sampai dengan lokasi lobster bertanda yang tertangkap kembali. Tingkat tertangkap kembali lobster pasir (P. homarus) bertanda di Teluk Prigi sebanyak 4,7 %. Laju pertumbuhan lobster pasir yang tertangkap kembali rata-rata 0,09±0,05 mm/hari. Pergerakan lobster pasir bertanda yang tertangkap kembali di Teluk Prigi berkisar antara 0,1-11,36 km. Pergerakan lobster pasir bertanda memiliki kecenderungan acak dan tetap pada wilayah pantai.In 2015, restocking experiment of Scalloped spiny lobster (Panulirus homarus) was conducted in Gulf of Prigi, Trenggalek Regency and the lobsters were tagged. This methods is known as Capture-mark-recapture (CMR). CMR is widely used to study of biota populations in wild nature. The aims of this study are to determine the recapture rate, growth rate, and movement of tagged scalloped spiny lobster in Prigi Bay.The tagged spiny lobster release was realesed at three locations, namely Damas, Karanggongso and Karangasem with 2,784 lobsters and was tagged with a red T-bar type that has a code. Observations of tagged scalloped spiny lobsters were carried out again throughout 2016 in Prigi Bay (February-December). The recapture rate of tagged spiny lobster is calculated using the proportion between the tagged lobster with the tagged lobster released. The tagged tagged spiny lobster growth rate is calculated again based on growth per unit time which is equal to the change in length divided by the change in age. Tagged spiny lobster movements are measured by distance from the location of release to the location of the tagged tagged spiny lobster is capture again. The recapture rate of tagged spiny lobster (P. homarus) marked in Gulf of Prigi as much as 4.7%. The growth rate of tagged spiny lobster averaged 0.09 ± 0.05 mm/day. The movement of tagged spiny lobster in Gulf of Prigi ranges from 0.1 to 11.36 km. The movement of tagged spiny lobster has a random movement and remains in the coastal region.

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