tailieunhanh - BÁO CÁO " THỬ NGHIỆM KHẢ NĂNG THÍCH NGHI NỒNG ĐỘ MUỐI CỦA CÁ TRA NGHỆ (Pangasius kunyit) "

Đề tài “Thử nghiệm khả năng thích nghi nồng độ muối của cá tra nghệ (Pangasius kunyit)” được thực hiện từ tháng 7 đến tháng 10/2011, với mục tiêu đánh giá khả năng thích nghi độ mặn ở giai đoạn ương cá bột và nuôi cá giống. Nội dung nghiên cứu của đề tài được thực hiện trong 3 thí nghiệm; cá được ương, nuôi trong bể composite thể tích 0,5 m3. Thí nghiệm thứ nhất, ương cá bột đến 30 ngày tuổi, thí nghiệm bố trí hoàn toàn ngẫu nhiên 3 nghiệm thức 0, 3 và 6‰ với. | THỬ NGHIỆM KHẢ NĂNG THÍCH NGHI NỒNG ĐỘ MUỐI CỦA CÁ TRA NGHỆ Pangasius kunyit Vương Học Vinh1 Lê Hoàng Quốc2 Tống Minh Chánh3 1 Bộ môn Thủy sản Khoa Nông Nghiệp TNTN Đại Học An Giang Email vhvinh@ agu. edu. vn vhvinh@gmail. com 2 Sinh viên lớp DH9TS Ngành Nuôi trồng Thủy sản Khoa Nông Nghiệp và Tài nguyên thiên nhiên Trường Đại học An Giang 3 Công ty TNHH Minh Chánh ABSTRACT The study of Experiment on the adaptability with different salinity concentration of catfish Pangasius kunyit was carried out from July to October in 2010 aimed to determine the adaptability of fry and fingerlings to different salinity concentrations in rearing stage. This study content was performed with three experiments. The fish was reared in composite tanks. In the first experiment the fry was reared for 30 days. The experiment was a completely randomized design with 3 treatments 0 o 3 6 and 4 replicates. Results showed that there was no significant difference of weight gain p but there was significant difference of survival rate. In which the lowest survival rate was at 0 treatment and other treatments were and . In the second experiment the fish was reared from 30 to 60 day. The experiment was a completely randomized design with 5 treatments 0 o 3 6 9 12 and 4 replicates. Results indicated that there was significant difference of weight gain the highest growth was at 6 . Similarly there was significant difference of survival rate between freshwater and brackish water. The lowest survival rate was at 0 treatment and the highest was at 6 treatment 100 . The third experiment to study adaptability of the fish to salinity. The experimented fish was randomly chosen from 6 treatment of the first experiment. The salinity concentration was raised 2 in every day as far as 27 . Results showed that the survival rate obtained 98 and the weight obtained 1 68g . From the above results we could conclude that Pangasius kunyit is one of euryhaline fish and