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Ảnh hưởng của mật độ nuôi đến sinh trưởng, tỷ lệ sống và hiệu quả kinh tế của cá chẽm (Lates calcarifer) nuôi trong ao đất

Bài viết này thử nghiệm đánh giá ảnh hưởng của các mật độ nuôi, từ 1 - 5 con/m2 lên tốc độ tăng trưởng, tỷ lệ sống và hiệu quả kinh tế của việc nuôi cá chẽm (Lates calcarifer ) trong ao đất. Cá có chiều dài ban đầu 90,7 ± 0,1 mm và khối lượng 20,8 ± 0,1 g/con được bố trí trong các ao đất có diện tích 600 m2 /ao, mực nước ao 1,5 m. Mời các bạn cùng tham khảo! | 62 Trường Đại học Nông Lâm TP. Hồ Chí Minh Effects of stocking density on growth performance survival rate and economic efficiency of Asian seabass Lates calcarifer cultured in earthen pond Nhan T. Dinh Faculty of Fisheries Nong Lam University Ho Chi Minh City Vietnam ARTICLE INFO ABSTRACT Research Paper This trial aimed to evaluate effects of stocking densities of 1-5 fish m2 on growth performance survival rate and economic efficiency of Asian Received September 01 2020 seabass Lates calcarifer in earthen ponds. Fish with an initial length Revised September 25 2020 of 90.7 0.1 mm and weight of 20.8 0.1 g fish and ponds with 600 Accepted October 23 2020 m2 each and 1.5 m depth were used for this study. Experiment was de- signed with three treatments including different stocking densities of 1 3 and 5 fish m2 . The fish was fed with pellete feed containing 43 Keywords 44 crude protein. Water quality parameters including temperature dissolved oxygen pH salinity transparency and ammonia concentration were measured once a week. Fish were sampled every 30 day intervals for Asian seabass length and weight measurement then for their growth estimation. Costs Density were recorded for economic efficiency estimation. Results showed that the Earthen pond water quality parameters were in suitable ranges for growth and devel- Economic efficiency opment of Asian seabass. The final average length and weight of density Growth 1 fish m2 was significantly higher than those at 3 and 5 fish m2 P lt 0.05 . However there was no significant difference on the fish growth in terms of daily length and weight gain as well as survival rate and Corresponding author feed conversion ratio between different stocking densities. Asian seabass culture at 3 and 5 fish m2 resulted in a higher profit compared to at Dinh The Nhan 1 fish m2 . The highest economic efficiency in terms of area pond was 2 Email dtnhan@hcmuaf.edu.vn showed at 5 fish m treatment. Cited as Dinh N. T. 2020 . Effects of stocking