ĐẶC ĐIỂM SINH HỌC SINH SẢN CỦA CÁ LỊCH ĐỒNG (Ophisternon bengalense)

The biological reproductive properties of the mangrove Bengal eel (Ophisternon bengalense) were investigated using samples taken once a month (30 samples) during a 12-month period in Tac Van commune, Ca Mau province. Samples were collected and transported to the College of Aquaculture of Can Tho University for analysis. In April and November, the maximum condition factor (CF) was 0.0012 g/cm. This finding confirms that mangrove Bengal eel is a hermaphroditic species. The typical sex ratio in wild populations of male, hermaphrodite, and female was 35.6%, 4.5%, and 58.8%, respectively. The lowest energy accumulation coefficient (HSI) occured in March, April, and October (1.78-1.79%). The highest gonad index was observed in March, April, and October (1.29, 1.47, and 1.27, respectively), however, the highest maturity rate occurred in April and October (46.7%). Absolute fecundity of mangrove Bengal eel ranged from 100 to 540 eggs/female. The relative fecundity ranged from 1.12-10.8 eggs per gram of body weight. The average egg diameter in stage III was 1.99mm, while in stage IV was 4.40.