Asmanik, Happy Nursyam, Maheno Sri Widodo, Arning Wilujeng Ekawati, Putut Har Riyadi
The cobia fish (Rachycentron canadum) is gonochoristic and the oocyte development is nonsynchronous. The aim of this study was to analyse the gonadal development of cobia fish (cultivation fish raised in floating netcage) starting from juvenile (3 months old) until 15 months old (estimated gonadal maturation). Samples of blood, gonad, and pituitary of female cobia fish at some ages (3, 6, 9, 12, and 15 months) was taken and than the measurement of several parameters, ie; body weight, gonad weight, body total length, FSH hormone concentration was commenced, and also the making of histological preparation of gonad and pituitary. As well as observation on the growth of body weight and development of cobia fish oocyte (age 6 – 9 month) which raised in controlled tank. The result of this study is that at age 3 – 8 months the development of oocyte reached the previtollogenic stage, while at age of 9 months, the gonad of cobia cultivated fish start developing to stage of vitellogenesis and maturation (percentage of mature oocyte was 0,98± 0,37%). © IJSTR 2020.
Faculty Fisheries and Marine Sciences, Brawijaya University, Malang, Indonesia