Abstract
Ikan demersal merupakan salah satu sumber daya yang memiliki potensi sangat tinggi di Laut Arafura. Informasi indeks keanekaragaman ikan demersal diperlukan setelah adanya moratorium pukat tarik di Laut Arafura. Kegiatan penelitian dilaksanakan pada tanggal 20 Oktober sampai 20 November 2018 dengan mengikuti survei sumber daya ikan di Wilayah Pengelolaan Perikanan (WPP) 718 Laut Aru dan Arafura. Analisis data menggunakan beberapa nilai indeks biodiversitas meliputi keanekaragaman jenis (species diversity), kemerataan (species evenness), kekayaan jenis (species richness), dan dominansi jenis (species dominant). Keanekaragaman jenis dibagi dalam 3 (tiga) wilayah penelitian yaitu Timur, Barat dan Utara Laut Arafura. Indeks Keanekaragaman Shannon Wiener (H’) ikan demersal bervariasi antara 1,26 – 2,89. Nilai indeks kekayaan jenis ikan 9,37—16,8, indeks dominansi (D) antara 0,09-0,51. Indeks kemerataan jenis dari Pielou (E) Arafura bagian timur 0,13 dan utara dengan nilai 0,24 dan perairan Arafura bagian barat nilai indeks sebesar 0,27. Nilai indeks kemerataan jenis antara 0,26-0,50. Kondisi tersebut menunjukkan adanya keseimbangan dalam pemanfaatan sumber daya ikan demersal yang ada baik dari segi pemangsaan maupun secara spasial di Laut Arafura.Demersal fish is a resource that has very high potential in the Arafura Sea. Information on the diversity index of demersal fish is needed after the moratorium on trawling in the Arafura Sea. The research activity was carried out from 20 October to 20 November 2018 by participating in a survey of fish resources in the 718 Aru and Arafura Sea Fisheries Management Area (WPP). Data analysis used several biodiversity index values including species diversity, species evenness, species richness, and species dominance. Species diversity is divided into 3 (three) research areas, namely East, West and North Arafura Sea. The Shannon Wiener Diversity Index (H') of demersal fish varies between 1.26 – 2.89. Fish species richness index value is 9.37-16.8, dominance index (D) is between 0.09-0.51. The evenness index of Pielou (E) eastern Arafura is 0.13 and north is 0.24 and the Arafura waters is 0.27. The value of the species evenness index is between 0.26-0.50. This condition shows that there is a balance in the utilization of existing demersal fish resources, both feeding habits and spatial in the Arafura Sea.
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