Nghiên cứu này cung cấp dẫn liệu mới về đặc điểm hình thái ống tiêu hóa và sự biến động của hệ số béo Clark theo giới tính, nhóm chiều dài cá, mùa thu mẫu và điểm thu mẫu của loài cá bống lưng cao Butis koilomatodon, một trong những loài cá bống có giá trị thương phẩm ở vùng Đồng bằng sông Cửu Long. | VNU Journal of Science Natural Sciences and Technology Vol. 36 No. 3 2020 61-69 Original Article The Digestive Tract Morphology and Clark index of Mud Sleeper Butis koilomatodon Living in some Coastal and Estuarine areas belonging to Tra Vinh Soc Trang Bac Lieu and Ca Mau Dinh Minh Quang1 Nguyen Thi Nha Y2 Lam Thi Huyen Tran3 4 Phan Thanh Gieo3 5 1 School of Education Can Tho University Campus II 3 2 street Xuan Khanh Ninh Kieu Can Tho Vietnam 2 College of Natural Science Can Tho University Campus II 3 2 street Xuan Khanh Ninh Kieu Can Tho Vietnam 3 Biotechnology Research and Development Institute Can Tho University Campus II 3 2 street Xuan Khanh Ninh Kieu Can Tho Vietnam 4 Faculty of Agriculture and Fishery University of Cuu Long Phu Quoi Vinh Long Vietnam 5 Faculty of Natural Resource and Environment Kien Giang University 320A AH 61 Vinh Hoa Hiep Chau Thanh Kien Giang Vietnam Received 06 April 2020 Revised 07 August 2020 Accepted 17 August 2020 Abstract This study provides new data on the characteristics of the gastrointestinal morphology and the variation of Clark index according to sexes fish size groups seasons and sampling sites of mud sleeper Butis koilomatodon one of the commercially valuable gobiid species in the Mekong Delta. Analytical results of 1 227 fish samples collected monthly from April 2019 to March 2020 in Duyen Hai Tra Vinh Cu Lao Dung Soc Trang Tran De Soc Trang Hoa Binh Bac Lieu Dong Hai Bac Lieu and Dam Doi Ca Mau showed that this species had a slightly sloping mouth the length between two jaws was relatively equal teeth were small and grew in long lines on both jaws with the outer row having larger teeth. The length of the gut was shorter than the total length of the fish and so this species belonged to predator group. The Clark index depended on length of fish sampling time and site but excluding season and gender. It was also effected by interactions of fish length x season fish length x site and season x site. Conversly the .
