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Nghiên cứu này tập trung vào tình trạng của các trại sản xuất giống cá sân sau ở An Giang và Đồng Tháp. Các kỹ thuật sinh sản nhân tạo của Channa micropeltes cũng được tiến hành trong các trại giống từ 11/2006 đến 9 / 2007. | Tạp chí Khoa học 2008 2 20-28 Trường Đại học Cần Thơ HI ỆN TR Ạ NG SẢ N XUẤ T GIỐNG VÀ KỸ THUẬ T KÍCH THÍCH CÁ LÓC BÔNG Channa micropeltes SiNh sảN Nguyễn Huấn1 và Dương Nhựt Long2 ABSTRACT This study focused on status of the backyard fish hatcheries in An Giang and Dong Thap provinces. The artificial reproduction techniques of Channa micropeltes was also conducted in the hatcheries from 11 2006 to 9 2007. The objective of this study was to investigate the basic techniques for development of artificial reproduction procedure of the giant snakehead species. Results of the survey indicated that all the hatcheries breed Channa micropeltes naturally with low efficiency. The spawning season of this species starts from January to July. Fish spawn around 5-6 times per year and nest during the reproduction time. Brood fish fed by trash fish with a feeding rate of 3-5 body weight were mature and ready to spawn after 3-4 months. Egg of Giant Snakehead is rather big 1.21.9 mm in diameter . The fecundity was low ranging from 2 000-2 500 eggs kg offemale. At water temperature of27-29oC fish completely ovulated when induced by HCG with a dose of500 UI and 1.500 UI plus 1 PG per kg offish. Ovulation occurred within 24-27 hours at the dose of1.500 UI. However eggs of fish injected with the same dose that did not have complete ovulation were not fertilized. Inducing fish by two injections of500 UI HCG eggs produced had higher fertilization rate and hatching rate 67 and 71.2 respective . In practice application of HCG and PG to induce spawning of fish is feasible and efficient. This can help produce enough good quality fingerlings to meet the grow-outdemand in the Mekong Delta. Keywords Channa micropeltes reproduction spawning season fecundity and fertilizer Title The hatcheries status and technical aspects for Snakehead spawning Channa micropeltes TÓM TẮT Đề tài khảo sát hiện trạng sản xuất giong trong dân gian và nghiên cứu kỹ thuật kích thích sinh sản cá Lóc bông Channa .
