Embryonic development and growth of larval and juvenile basa fish striped catfish (Pangasianodon hypophthalmus) and the determination of growth model
NI Wei，CHEN Haigang，LIU Xiaoli，YU Lingyun，LI Wei，HONG Xiaoyou，LIU Yihui*，ZHU Xinping*
1.Key Laboratory of Tropical &Subtropical Fishery Resource Application &Cultivation，Ministry of Agriculture and Rural Affairs，Pearl River Fisheries Research Institute，Chinese Academy of Fishery Sciences，Guangzhou 510380，China；2.College of Life Science and Fisheries，Shanghai Ocean University，Shanghai 201306，China
Abstract: To elaborate embryonic development and growth of larval and juvenile basa fish striped catfish (Pangasianodonhypophthalmus), the fertilized eggs were obtained from spawners with body weight of 4.0-8.0 kg by hormone injection and artificial insemination and the developmental characteristics of the embryos were observed. The effects of water temperature [(24±0.5), (27±0.5), (30±0.5), and (33±0.5)]℃ and salinity of 0, 2, 4, 6, 8, 10, 11, and 12 on the embryonic development were investigated in a biochemical incubator (SPM-50). The fertilized eggs are transparent viscid egg with diameter of (1.60±0.23)mm, and the embryonic development process was divided into 7 stages at water temperature of (30±0.5)℃, including fertilized egg, cleavage, blastula, gastrula, neurula, organogenesis and hatching (totally 23 developing periods). It began to hatch after 22 hours at water temperature of (30±0.5)℃, and all hatched in 28 hours. The newly hatched larvae had total length (TL) of (4.38± 0.23)mm at the water temperature of (30±0.5)℃. It was found that 27 ℃ to 30 ℃ was of the optimum incubation water temperature,with the maximal hatching rate from 49.35% to 44.33%, and that 0 of the optimum salinity, with the maximal hatching rate of 54.33%. It was found that as the salinity increased, the hatching rate gradually decreased. Under the condition of water temperature at (30±0.5)℃, the striped catfish as a tropical fish grew and developed into the fingerling stages (30 d) via the pre-larvae (0-2 d), post larvae (3-16 d), and juvenile (17-29 d). The yolk sac was exhausted completely on the third day post hatching, with a short incubation period. The finding indicates that the striped catfish has a short incubation period and is typical warm-water freshwater fish. The optimal hatching temperature was found to be 27 to 30 ℃, and the most suitable salinity was 0. The larvae and juveniles exhibited slow growth in the early stages, but after 20 days, they started to grow rapidly, classifying them as fast-growing fish.
倪未, 陈海港, 刘晓莉, 于凌云, 李伟, 洪孝友, 刘毅辉, 朱新平. 巴沙鱼低眼巨鲶胚胎和仔稚鱼发育观察及其生长模型的确定[J]. 大连海洋大学学报, 2023, 38(4): 584-592.
NI Wei, CHEN Haigang, LIU Xiaoli, YU Lingyun, LI Wei, HONG Xiaoyou, LIU Yihui, ZHU Xinping. Embryonic development and growth of larval and juvenile basa fish striped catfish (Pangasianodon hypophthalmus) and the determination of growth model. Journal of Dalian Ocean University, 2023, 38(4): 584-592.
2023, Vol. 38 
