Dương Thúy Yên , Đào Minh Hải , Đặng Quang Hiếu , Bùi Minh Tâm , Phạm Thanh Liêm , Bùi Thị Bích Hằng , Đỗ Thị Thanh Hương , Patrick Kestemont , Frédéric Farnir Nguyễn Thanh Phương *

* Tác giả liên hệ (ntphuong@ctu.edu.vn)

Abstract

The development of saline-tolerant striped catfish adapting to climate change is of great importance for fish farming in the Mekong Delta. Over the last 5 years, we have succeeded in selecting a striped catfish strain with better tolerance to salinity (up to 10‰). Striped catfish can mature well in 5‰ with reproductive parameters similar to those cultured in freshwater conditions. In the following generation, survival rates of the selected and random groups were similar at salinities from 0‰ to 15‰ and insignificantly higher than the freshwater group (p>0.05). After one generation of selection under saline water conditions, realized heritability for body weight was moderate (0.29)  and the average direct responses to selection for growth and survival were 18.0% and 11.4%, respectively. Physiological studies indicated that striped catfish can develop at 15‰ and that the salinity of 20‰ was considered the saline water tolerant limit of striped catfish. The gut of striped catfish was most responsive to changes in the osmotic pressure of water environment compared with other organs. 'Hormesis' method showed that exposure to the saline condition of 5‰ in the larval stage had the potential to alter gene expression related to osmotic regulation, immunity, and stress,...

Keywords: Fish growth, gene expression, immunology, mass selection, saline tolerance

Tóm tắt

Phát triển dòng cá tra chịu mặn để thích ứng với biến đổi khí hậu có ý nghĩa quan trọng đối với nghề nuôi cá tra ở Đồng bằng sông Cửu Long. Trong 5 năm qua, chúng tôi đã thành công trong chọn lọc được dòng cá tra chịu mặn đến 10‰. Cá thành thục tốt ở 5‰ với các chỉ tiêu sinh sản tương tương với cá nuôi trong nước ngọt. Tỷ lệ sống của nhóm cá chọn lọc và không chọn lọc tương đồng nhau ở độ mặn từ 0‰ tới 15‰ và cao hơn nhóm cá nước ngọt mặc dù khác biệt không có ý nghĩa (p>0,05). Sau một thế hệ chọn lọc trong nước lợ, hệ số di truyền về khối lượng là 0,29, tăng trưởng khối lượng tăng 18,0% và tỷ lệ sống tăng 11,4%. Nghiên cứu về sinh lý học cho thấy cá tra có khả năng sinh trưởng ở 15‰ và độ mặn 20‰ được xem là giới hạn chịu đựng của cá tra. Đường ruột của cá phản ứng mạnh nhất với sự thay đổi áp suất thẩm thấu của môi trường so với các cơ quan khác. Phương pháp “hormesis” ...

Từ khóa: Biểu hiện gen, chịu mặn, chọn lọc hàng loạt, miễn dịch, tăng trưởng cá

Article Details

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