Variasi Morphology of the Sorong Rainbowfish Melanotaenia fredericki (Fowler, 1939) from the Salawati Population, Sorong Regency, Indonesia
Abstract
Rainbowfish (Melanotaenia) is the most specious genus wthin the Melanotaeniidae, comprising 89 species inhabiting the freshwater environments occured both two landmass of Australia and New Guinea, including Indonesian Papua. In the Bird’s Head of Papua, 39 species have been recorded, one of which is Melanotaenia fredericki (Fowler, 1939), found in Sorong and Salawati Island. This study aims to examine morphological variation of the seven populations of M. Fredericki and a nominal species using multivariate (PCA) and bivariate scatterplot analyses based on 19 morphometric characters. The PCA results indicate that most characters are non-diagnostic due to overlapping among populations. However, bivariate scatterplot analysis revealed several diagnostic characters, such as eye diameter (ED), first dorsal fin length (SLSDF), pelvic fin length (PFL), and Snout length (SNL), which distinguish specific populations. Populations from Bendungan Majaran, Fasin, Kalobo, Makotyamsa, and Kurnia Sorong exhibit unique morphological traits, while Klamono and the Tentara Klamono Site show no diagnostical characteristics.
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