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Isa Nagib edrus
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DIVERSITY OF REEF FISH FUNGSIONAL GROUPS IN TERMS OF CORAL REEF RESILIENCES Isa Nagib edrus; Muhammad Abrar Abrar
Indonesian Fisheries Research Journal Vol 22, No 2 (2016): (December, 2016)
Publisher : Research Center for Fisheries

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (27.98 KB) | DOI: 10.15578/ifrj.22.2.2016.109-122

Abstract

Infrastructure development in the particular sites of  Seribu Islands as well as those in main land of Jakarta City increased with coastal population this phenomenon is likely to increase the effects to the adjacent coral waters of Seribu Islands.  Chemical pollutants, sedimentation, and domestic wastes are the common impact and threatening, the survival of coral reef ecosystem. Coral reef resiliences naturaly remained on their processes under many influences of supporting factors. One of the major factor is the role of reef fish functional groups on controling algae growth to recolonize coral juveniles. The  aim of this study to obtain data of a herbivory and other fish functional groups of reef fishes in the Pari Islands that are resilience indicators, or that may indicate the effectiveness of management actions. A conventional scientific approach on fish diversity and abundance data gathering was conducted by the underwater visual cencus. Diversity values of the reef fish functional groups, such as the abundance of individual fish including species, were collected and tabulated by classes and weighted as a baseline to understand the resilience of coral reed based on Obura and Grimsditch (2009) techniques. The results succesfully identified several fish functional groups such as harbivores (21 species), carnivores (13 species) and fish indicator (5 species) occurred in the area. Regarding the aspects of fish density and its diversity, especially herbivorous fish functional group, were presumably in the state of rarely available to support the coral reef resiliences. Resilience indices ranged from 1 (low level) to 3 (moderate level) and averages of the quality levels ranged from 227 to 674. These levels were inadequate to support coral reef recolonization.
STRUKTUR KOMUNITAS IKAN KARANG DI PERAIRAN PULAU RAYA, PULAU RUSA, PULAU RONDO DAN TAMAN LAUT RINOI DAN RUBIAH, NANGGROE ACEH DARUSSALAM Isa Nagib Edrus; Suseno Wangsit Wijaya; Iwan Erik Setiawan
Jurnal Penelitian Perikanan Indonesia Vol 19, No 4 (2013): (Desember 2013)
Publisher : Pusat Riset Perikanan, BRSDM KP.

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (631.75 KB) | DOI: 10.15578/jppi.19.4.2013.175-186

Abstract

Penelitian struktur komunitas ikan karang dilakukan di 10 stasiun pada perairan pulau terluar dan 2 stasiun pada taman laut Nanggroe Aceh Darussalam.  Tujuan penelitian untuk mengindentifikasi struktur komunitas ikan karang. Metode yang digunakan adalah transek sabuk dan sensus visual dalam area 250 m2. Hasil penelitian menunjukkan bahwa didapat 235 jenis ikan karang yang mewakili 45 suku. Komposisi jenis dan keanekaragaman (H) bervariasi antar stasiun. Pulau Raya memiliki jumlah jenis ikan karang dan keanekaragaman jenis yang paling rendah dibanding Pulau Rusa dan Pulau Rondo. Lokasi Pulau Rondo lebih jauh dari daratan utama dan memiliki jenis dan keanekaragaman yang lebih tinggi dari pada Pulau Raya dan Rusa, tetapi semua itu masih rendah jika dibandingkan dengan dua lokasi taman laut, Rinoi dan Rubiah. Ikan hias yang umum dijumpai di perairan Nanggroe Aceh Darusasalam, tetapi jarang dijumpai di tempat lain, adalah dari jenis kepe-kepe seperti Chaetodon andamanensis, Chaetodon xanthocephalus, Hemitaurichthys zoster dan jenis ikan antias punggung kuning, Pseudanthias  evansi. Sementara, kepadatan individu per meter persegi tergolong rendah pada semua stasiun penelitian. The community structure study of reef fish was conducted in 10 stations of the adjacent bordered off islands and 2 stations of  around sea gardens of Nanggroe Aceh Darussalam waters. The study objective is to identify the reef fish community structures. Methods used was belt transect and visual census within area of   250 m2. The results showed that there were at least 235 species of reef fishes with 45 families. Species compositions and diversity indices (R) were varied among transect sites. Raya Island have the lowest of reef fish species numbers and it’s diversity than those in Rusa and Rondo islands. Rondo island, the remote area from the main land, have the higher  species numbers and diversity than those in Raya and Rusa islands; however, species numbers and diversity of reef fish in Rondo still lower than those in sea garden of Rinoi and Rubiah. The ornamental fish commonly found in Nanggoe Aceh Darussalam, but umcommon in other regions, are butterfly fishes such as Chaetodon andamanensis, Chaetodonxanthocephalus, Hemitaurichthys zoster and yellowback anthias, Pseudanthiasevansi. While, individual density per square meter was rare for all  of the transect areas. 
Co-Authors Iwan Erik Setiawan Muhammad Abrar Abrar Suseno Wangsit Wijaya