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Dharmadi Dharmadi

Pusat Penelitian dan Pengembangan Perikanan

Author-ID : 3721082

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

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CATCH COMPOSITION AND SOME BIOLOGICAL ASPECTS OF SHARKS IN WESTERN SUMATERA WATERS OF INDONESIA Dharmadi Dharmadi; Mahiswara Mahiswara; Kamaluddin Kasim
Indonesian Fisheries Research Journal Vol 22, No 2 (2016): (December, 2016)
Publisher : Research Center for Fisheries

This study was conducted in western Sumatera and since October 2013 to June 2014. The sampling locations in Banda Aceh and Sibolga-North Sumatera which were the largest base of fisheries in western Sumatera region. Shark landing recorded by enumerators was used as sampling data daily . This research aim to describ sex ratio, size composition, catch composition of sharks, and length at first maturity. In Banda Aceh, the sharks as target fish collected by sorting the bycatch from tuna longlines and tuna handlines. In Sibolga, sharks is bycatch from fish net, bottom gillnet and purse seine. Overall, there were 20 species of shark caught in west Indian Ocean and landed at those fish landing sites, dominated by Spot tail shark (23%) and Silky shark (13%), whereas Hammerhead shark contributed about 10% and Oceanic whitetip shark was only less than 1%. Almost of Spot tail shark, Silky shark, and Scalloped hammerhead that caught in that area were immature, while for the almost part of Tiger shark and Pelagic thresher were matured. The sex ratios for Spot tail shark, Silky shark, Tiger shark, Pelagic thresher, and Scalloped hammerhead caught and landed at Lampulo and Sibolga fish landing sites were not balance. The length at first maturity for Spot tail shark was Lm=87,1 cm and Lm = 213,2 cm total length for Tiger shark.

PARAMETER POPULASI HIU MARTIL (Sphyrna lewini Griffith & Smith, 1834) DI PERAIRAN SELATAN NUSA TENGGARA Agus Arifin Sentosa; Dharmadi Dharmadi; Didik Wahju Hendro Tjahjo
Jurnal Penelitian Perikanan Indonesia Vol 22, No 4 (2016): (Desember 2016)
Publisher : Pusat Riset Perikanan, BRSDM KP.

Hiu martil (Sphyrna lewini Griffith & Smith, 1834) merupakan salah satu target tangkapan bagi perikanan artisanal di Indonesia. Dengan status konservasi masuk dalam Appendix II CITES, pengelolaan terhadap hiu martil telah menjadi perhatian khusus di bidang perikanan tangkap. Penelitian ini bertujuan untuk mengkaji beberapa aspek parameter populasi hiu martil yang tertangkap di perairan selatan Nusa Tenggara pada periode Januari – Desember 2015. Data ukuran panjang dan jenis kelamin diperoleh di Tempat Pendaratan Ikan Tanjung Luar, Lombok Timur, Nusa Tenggara Barat. Analisis dilakukan secara deskriptif menggunakan perangkat lunak FiSAT II. Hasil penelitian menunjukkan bahwa dari 634 ekor hiu martil yang tertangkap didominasi oleh jenis kelamin betina dengan sebaran ukuran panjang total berkisar antara 81 – 320 cm (rerata 211,2 cm) dan jenis kelamin jantan berkisar antara 91 – 310 cm (rerata 176,9 cm). Dominasi kelompok hiu muda yang belum matang kelamin berpotensi terjadinya recruitment overfishing. Hiu martil mampu mencapai panjang asimtot 399 cm. Laju pertumbuhan dan mortalitas jenis hiu jantan lebih tinggi dibandingkan jenis betina. Populasi hiu martil telah mengalami kondisi tangkap lebih sehingga perlu adanya regulasi dan pengelolaan agar pemanfaatannya tetap lestari. The scalloped hammerhead sharks (Sphyrna lewini Griffith & Smith, 1834) is one of the main target fishing for artisanal shark fisheries in Indonesia. By the conservation status of Appendix II CITES, its management had been concerned in capture fisheries. This research aimed to assess some aspects of scalloped hammerhead shark population parameters caught in the southern of Nusa Tenggara in the period from January to December 2015. Fish length and sex was obtained in Tanjung Luar landing site, East Lombok, West Nusa Tenggara. The analysis was done descriptively used FiSAT II software. The results showed that 634 individuals of hammerhead shark caught dominated by female with a total length size distribution ranging between 81-320 cm (mean 211.2 cm) and male ranged between 91-310 cm (mean 176.9 cm). The dominance catch of juvenile sharks with immature was potential to recruitment overfishing. Sphyrna lewini was capable of reaching 399 cm asymptotic length. The growth rate and mortality of male sharks was higher than female. The population of S. lewini had been overfished so that the regulation and management are needed in order to maintain their sustainability of the population.

STATUS PEMANFAATAN IKAN NAPOLEON (Cheilinus undulatus Rüppel, 1835) DI SULAWESI SELATAN Dian Oktaviani; Regi Fiji Anggawangsa; M Adha Akbar; Dharmadi Dharmadi
Jurnal Penelitian Perikanan Indonesia Vol 21, No 4 (2015): (Desember 2015)
Publisher : Pusat Riset Perikanan, BRSDM KP.

Sulawesi Selatan merupakan salah satu daerah pemasok ikan napoleon (Cheilinus undulates Rüppel, 1835; Labridae) hidup bagi pasar nasional maupun internasional. Akan tetapi informasi mengenai status pemanfaatan ikan napoleon dengan segala implementasi peraturannya dalam skala lokal masih sedikit. Tujuan penelitian ini adalah untuk mengetahui status pemanfaatan ikan napoleon dengan pendekatan penilaian Non Detrimental Finding (NDF) di Sulawesi Selatan. Penelitian didasarkan pada data dan informasi dari penampung serta instansi terkait sebagai bentuk pemanfaatan yang dihubungkan dengan keberlanjutan populasi spesies tersebut di alam. Metode yang digunakan berupa pengamatan langsung, wawancara, dan studi literatur yang berlokasi di Kabupaten Sinjai, Kabupaten Bone, dan Kota Makassar. Pengumpulan data dari wawancara dan pengamatan lapangan dilakukan pada Maret dan November 2014, sedangkan studi literatur dilakukan selama periode penelitian antara Januari – Desember 2014. Hasil penelitian menunjukkan bahwa penilaian NDF terhadap status pemanfaatan ikan napoleon di Sulawesi Selatan mengindikasikan adanya gangguan terhadap populasi ikan tersebut di alam (nilai: 3,81 ≈ 4). Opsi pengelolaan yang dapat dilakukan adalah melakukan moratorium selama lima tahun yang disertai implementasi peraturan yang lebih ketat dan meningkatkan penyuluhan tentang dampak negatif penangkapan ikan dengan menggunakan racun dan bom. South Sulawesi is one of the regional sources of humphead wrasse (Cheilinus undulates Rüppel, 1835; Labridae) for national and international trades of life reef fishes. However, few information was available regarding the implementation of the rules for local utilization of humphead wrasse. The current study was conducted to fill a gap, especially in relation to the sustainability of the population and trade of the species. The research was aimed to identify the level of local utilization of humphead wrasse based on Non Detrimental Finding (NDF) approach in South Sulawesi. The method applied in the research was a direct observation, an interview, and a desk study in Sinjai Regency, Bone Regency, and Makassar City. Data collection included field surveys and visits to some collectors and governmental institutions were undertaken in March and November 2014. Desk study was conducted as long as the research period done from January to December 2014. Following the inclusion of humphead wrasse in CITES Appendix II determination of Non Detrimental Finding (NDF) was considered essential. It shows that harvest and subsequent trades in humphead wrasse population in South Sulawesi indicated a detrimental trend (score: 3,81 ≈ 4). The solutions found out are moratorium minimum five years inline with tight implementation of the rules and an education of broader negative effect of using of poission and bom in capturing the fish.

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