Femy Mahmud Sahami, Rene Charles Kepel, Abdul Hafidz Olii, Silvester Benny Pratasik
Nike is a term for minuscule fish that frequently appear in Gorontalo waters. This type of fish belongs to the amphidromous goby group. This study aims to describe the morphological alterations of Nike fish from the sea to the estuary area of Gorontalo waters based on molecular analysis and different melanophore pattern. The small size of this fish (larval stage and post-larva) cause difficulties in analysing morphometric and meristic aspects. Therefore, the melanophore pattern approach and molecular analysis using the COI gene were used to identify and study the fish species. Sampling was carried out from 5 to 11 October 2018 in Gorontalo Bay area and the mouth of Bone Bolango river. The study was carried out when this type of fish appeared in the research area. Samples of Nike fish were grouped based on differences in melanophore patterns in the body. It was found there were five different groups. The groups were coded N1, N2, N3, N4 and N5. The molecular analysis using the COI gene was used to identify the fish species. Genetic investigations showed that from five groups, there were two groups (N3 and N5) that had different melanophore patterns, but belong to the same species, Belobranchus segura. Morphological changes have occurred due to an increase in the melanophore patterns of Nike species when they migrate from the sea to the river. © 2019, BIOFLUX SRL. All rights reserved.
Department of Aquatic Resources Management, Gorontalo State University, Jl. Jendral Sudirman, No. 6, Gorontalo City, 96128, Indonesia; Faculty of Fisheries and Marine Science, Sam Ratulangi University, Manado City, Indonesia
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