KOMPOSISI JENIS,KEPADATANDANKEANEKARAGAMAN JUVENILIKANPADAPADANGLAMUNGUGUS PULAUPARI

Abstract

Penelitian tentang juvenil di padang lamun Pulau Pari pada bulan Juni 2009 bertujuan untukmengetahui komposisi jenis, kepadatan dan keanekaragaman juvenil ikan. Sampling dilakukan pada siang hari dengan menggunakan jaring arad. Hasil penelitian menunjukkan bahwa jenis ikan yang tertangkap terdiri dari 55 jenis yang berasal dari 42 marga dan 23 suku. Sebanyak 52 jenis (98%) tergolong juvenil. Ikan dengan status penghuni tetap sebanyak 31 jenis, musiman 11 jenis, dan penghuni tidak tetap 14 jenis. Kelompok ikanmajor terdapat 34 jenis, kelompok ikan target 20 jenis dan kelompok ikan indikator 2 jenis. Kepadatan antar lokasi berkisar antara 0,05 - 0,34 indivdu/m2 dengan ratarata 0,2 individu/m2 atau setara dengan 2.000 ekor per ha. Indeks keanekaragaman (H) berkisar antara 1,3 - 2,7. Jenis jenis yang mendominasi hasil tangkapan antara lain adalah Apogon margaritophorus, A.ceramensis, Acreichthys tomentosus, Halichoeres argus, Lethrinus harax, Papilloculiceps longiceps dan Cheilodepterus quinquelineatus. Tidak terdapat korelasi antara habitat (substrat, jenis, tutupan serta jumlah tegakan lamun/m2) terhadap pola keanekaragaman juvenil ikan. Oleh karena itu perlu sampling yang lebih intensif (siang dan malamhari, saat pasang dan surut), dan sampling di pulau-pulau lainnya yang terdapat di Kepulauan Seribu.

This study conducted in the seagrass beds of Pari Islands in June 2009. The aims are to assess the fish juvenile resources in terms of species diversity, stocks, composition, predominant, and group status. Data were collected using an arad net for juvenile. A total of 56 species of fish juveniles belong to 42 genus and 24 families were collected from seagrass bed of Pari Island. Those were consisted of 52 species (98%) that classified as juveniles. Among of them (31 species) were resident fishes that use seagrass in their whole live, 11 species of seasonal/traveller fishes, and 14 species of non-resident fishes. From the total 55 species of fish samples, there were 34 species belonging to target fishes, 20 species were major fishes, and 2 species were indicator fishes. The fish density ranged from 0.05 to 0.34 indivdual/m2 with an average of 0.2 individual/m2 or equivalen to 2.000 fishes per hectare. Diversity indeces (H) ranged from 1.3 to 2.7. Predominant species that prefer seagrass bed as their permanent resident habitat were Apogon margaritophorus, Apogon ceramensis, Acreichthys tomentosus, Halichoeres argus, Lethrinus harax, Papilloculiceps longiceps, and Cheilodepterus quinquelineatus. There are no relationship between habitat (substrates, seagrass species, percentage of cover, density of stems/number of stem/m2) and the diversity of fish juvenile pattern. Therefore, more intensive sampling must be done such as in the day and night time, in the high and low tide condition as well as sampling in other islands within the Seribu Islands.