tailieunhanh - Mối quan hệ giữa kích cỡ cá cái với một số chỉ tiêu sinh sản, đường kính trứng và tăng trưởng cá bột của cá tra (Pangasianodon hypophthalmus)

Nghiên cứu này nhằm xác định mối quan hệ giữa khối lượng cá cái với một số chỉ tiêu sinh sản, thể tích noãn hoàng và chiều dài cá bột của cá tra (Pangasianodon hypophthalmus). Cá tra thành thục được chọn từ bể tuần hoàn nuôi cá vỗ cá bố mẹ. Cá cái (n = 36) với khối lượng khác nhau (1,7 - 7,0 kg) được cho sinh sản nhân tạo với cùng nhóm cá đực. | 32 Trường Đại học Nông Lâm TP. Hồ Chí Minh The relationships of female size with reproductive parameters egg diameter and larval growth of striped catfish Pangasianodon hypophthalmus Thu A. Ta1 amp Yen T. Duong2 1 Aquaculture Course 44 College of Aquaculture amp Fisheries Can Tho University Can Tho City Vietnam 2 College of Aquaculture amp Fisheries Can Tho University Can Tho City Vietnam ARTICLE INFO ABSTRACT Research Paper This study aimed to quantify relationships between female weight and some reproductive parameters yolk sac volume and larval length of Received February 06 2022 striped catfish Pangasianodon hypophthalmus . Mature fish were se- Revised March 30 2022 lected from the broodstock conditioning tank in a recirculating system. Accepted April 14 2022 Females n 36 weighing to kg were artificially propagated with the same male group. The results showed that realized fecundity 331 667 - 1 404 791 eggs female was positively correlated P lt Keywords while relative fecundity 73 849 - 255 214 eggs kg female had a negative relationship with females weight P lt . Eighteen females were di- vided into 3 groups of weights 6 - 7 kg n 5 5 - kg n 8 and 3 - Female weight kg n 5 to examine other reproductive parameters. Egg diameter Fish larvae 1 014 - 1 024 µm fertilization rate - and hatching rate Maternal effect - were not significantly different among female groups. Pangasianodon hypophthalmus Larvae produced by medium and large-sized females appeared to grow Reproductive parameters in length faster than those by small-sized females and these differences were significant at hatching 24 and 72 h post-hatch P lt . Yolk sac volume was not different among the three groups P gt ranging Corresponding author from to mm3 at hatching and decreasing - after 36 h and - after 48 h post-hatch. In sum females weighing 5 Duong Thuy Yen to 7 kg had higher realized fecundity and better growth