Bài viết đã phân tích 360 mẫu cá chuối hoa (Channa maculata) khối lượng 198 – 873 gam, thu được từ 5 địa điểm thuộc các thủy vực ở Thanh Hóa từ tháng 1–12/2017 để xác định mùa sinh sản của loài này ngoài tự nhiên. | TAP CHI SINH HOC 2019 41 2se1 amp 2se2 255 263 DOI 0866-7160 v41n2se1 amp SEASONAL SPAWNING CYCLE IN NATURE OF BLOTCHED SNAKEHEAD Channa maculata Lacepède 1801 Ta Thi Binh1 Nguyen Huu Duc2 Do Van Tu3 Nguyen Dinh Vinh1 Nguyen Cong Thanh1 1 Department of Agriculture Forestry and Fisheries Vinh University Nghe An Vietnam 2 Faculty of biological Hanoi National University of Education Ha Noi Vietnam 3 Institute of Ecology and Biological Resourcer VAST Vietnam Received 12 August 2019 accepted 30 September 2019 ABSTRACT In order to determine the seasonal spawning in nature of Blotched Snakehead Channa maculata 360 adults of this species collected at 5 locations in the Thanh Hoa Province from January to December 2017 with body weights from 198 g to 873 gwere analyzed. The gonado somatic index GSI of this species was shown to be the highest in May for females and for males and lowest in December for females and for males . The conditional factor is from 10-2 to 10-2 for females and from 10-2 to 10-2 for males peaking in May 10-2 for females and 10-2 for males . The Fulton s and Clark s indecs were highest in November for Fulton s and for Clark s then decreased in the following months with lowest values recored in May Fulton and Clark . The highest gonadic maturity indexes as well as gonad maturity degree belonging III and IV stages of females and males were observered from April to June of the year during which the highest gonadic maturity indices and gonad maturity degree of 3rd and 4th stages were recorded. Keywords Channa maculata gonado somatic index seasonal spawning. Citation Ta Thi Binh Nguyen Huu Duc Do Van Tu Nguyen Dinh Vinh Nguyen Cong Thanh 2019. Seasonal spawning cycle in nature of blotched snakehead Channa maculata Lacepède 1801 . Tap chi Sinh hoc 41 2se1 amp 2se2 255 263. https 0866-7160 v41n2se1 amp . Corresponding author email .
