Poster Abstract
28. POPULATION DYNAMICS OF FISHES IN LITTORAL MARINE WATERS OF THE MEKONG DELTA, SOUTH OF VIET NAM
Tran Dac Dinh1;Jacques Moreau2;Nguyen Thanh Phuong1; Mai Viet Van1; Vo Thanh Toan1
1 Department of Fisheries Management and Economics, College of Aquaculture and Fisheries; Cantho University 3/2 Street, Cantho City, Viet Nam.
2 Laboratoire d’Ecologie Fonctionnelle, UMR 5245, ENSAT, BP 32607, Auzeville Tolosane, 31326 Castanet Tolosan, France
tddinh@ctu.edu.vn
The population dynamics of seven commercial species of fish (Congresox talabon, Cynoglossus cynoglossus, Peneahia argentatus, Peneahia pawak, Trichurius lepturus, Trypaugen vagina, and Upeneus sulphureus) distributed in littoral marine zone of the Mekong Delta were investigated. Length-based stock assessment using FiSAT II software package was used to assess the growth and mortality parameters such as asymptotic size (L8), growth coefficient (K), total (Z) and natural (M) mortality, exploitation rate (E), recruitment pattern, current probability of capture and selectivity of fishing gears. Yield-per-recruit analyses were carried out showing different levels of the exploitation. Results showed that the maximum sustainable yield would be reached for an exploitation rate higher than the current one for each population. However, the size at first capture should be increased for every population. The findings indicated that the current exploitations of fish populations distributed in littoral marine zone of the Mekong Delta are under exploitation level for maximum sustainable yield; however, all the fish populations are subject to growth over-exploitation.
Key words: Marine fish; Mekong Delta; Population Parameters; Length-based
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