BIOLOGI REPRODUKSI IKAN SEMBILANG (Plotosus canius) DI PERAIRAN PANTAI MAJAKERTA, INDRAMAYU, JAWA BARAT

Grey eel-tailed catfish (Plotosus canius) is one species of consumption fish that is quite popular in coastal communities. This study aims to analyze reproduction of the fish. Sampling was conducted monthly in Majakerta coastal area, Indramayu, West Java from February to April 2015. The total of samples observed were 98 fish, consisting of 65 males and 33 females. The observation was employed for sex ratio, gonad maturity stage, gonado somatic index, the size at first maturity, fecundity, and egg diameter of the fish. The result of this research shows that sex ratio of the fish was 2:1. Immature-mature fishes were found in each month. The size of first gonad maturity of the fish was 281 and 308,6 mm for male and female, respectively. Fecundity was 564-864, and according to oocyte diameter distribution, the fish was a partial spawner.Ikan sembilang (Plotosus canius) merupakan salah satu jenis ikan konsumsi yang cukup banyak digemari masyarakat pantai. Penelitian ini bertujuan untuk menganalisis aspek reproduksi ikan tersebut. Kegiatan pengambilan contoh ikan dilakukan tiap bulan di perairan Majakerta, Indramayu, Jawa Barat, mulai dari Februari–April 2015. Total ikan contoh yang diamati sebanyak 98 ekor ikan terdiri atas 65 ekor ikan jantan dan 33 ekor ikan betina. Pengamatan dilakukan pada rasio kelamin, tingkat kematangan gonad, indeks kematangan gonad, ukuran pertama kali matang gonad, fekunditas, dan diameter telur. Berdasarkan hasil penelitian didapatkan, perbandingan ikan sembilang jantan dan betina yaitu 2:1. Ikan dengan tingkat kematangan gonad I–IV ditemukan pada setiap pengamatan. Ukuran pertama kali matang gonad ikan sembilang jantan dan betina adalah 281 mm dan 308,6 mm. Ikan ini memiliki fekunditas berkisar 564-864 butir, dan berdasarkan distribusi telur, ikan sembilang tergolong partial spawner