Deteksi Seksual Dimorfisme Pada Benih Ikan Tawes (Barbonymus gonionotus, Bleeker 1850) Berdasarkan Morfologi

Abstract

Tawes fish is a fish that widely cultivated in Indonesia. Fish farming requires quality brooders. High quality brooders can be obtained from single sex cultivation. Single sex culture is done by selecting fish based on sex from juvenile phase. Determination of sex in fry for aquaculture has difficulties because sexual dimorphism is not yet clearly visible, so it is necessary to conduct research on sexual dimorphism in Tawes fish fry to support fish cultivation. The purpose of this study was to determine whether the morphological, meristic, and truss morphometric performances could be used to distinguish male and female Tawes fish fry, and to determine the morphological characters that could be used to distinguish male and female Tawes fish fry. The method used is a survey method with purposive sampling. The samples taken were 60 Tawes fish fry samples with 2 size groups. Group 1 are fry with a size of 5-6 cm and group 2 are fry with a size of 6.1-7 cm. The samples obtained were observed for their morphological appearance, namely morphological prformance, meristic, and truss morphometric. Morphological performance and meristic data were analyzed descriptively, while truss morphometric data were analyzed using SPSS with Mann Whitney Test. The results of this study indicate that the morphological and meristic performances do not show any sexual dimorphism, while the results of the truss morphometric measurements show a significant difference on the A2 line, namely the distance between the tip of the mouth and the end of the skull. Based on the results of the average truss morphometric measurements on the A2 line, it was found that the dorsal head of the Tawes fry was longer and pointed than the female fry.