GROWTH, MORTALITY AND YIELD PER RECRUIT OF THE SHRIMP SCAD (Alepes djedaba) FROM MEDITERRANEAN COAST
OF SINAI EGYPT
Attia, A.O. El_Aiatt
National Institute of Oceanography and Fisheries NIOF.
| Received 1/ 1/ 2018 |
Accepted 30/ 1/ 2018 |
Abstract
Growth, mortality and yield per recruit of the shrimp scad (Alepes djedaba)) from Mediterranean coast of Sinai Egypt. 780 specimens (11.1 to 25.3 cm total Length and 15.3 to 172.2 g total weight), were collected from January to December, 2016 (one fishing season). The relationship between length and weight was W= 0.0064*L 3.134. The Age groups were 0 to 5 years. Growths in length and weight at the end of each year were calculated as11.87, 15.94, 18.40, 20.40 and 22.37 cm for the 1, II, III, IV, and V year of life respectively and the growth in weight were 14.9 ,37.6 ,58.9 ,81.4 and 108.6 g for the 1, II, III, IV, and V year of life respectively. The growth parameters of von Bertalanffy equation were calculated as (L∞= 26.94 cm, K = 0.2946 year-1 and t0 = -1.0408 year). Growth performance index (φ′ = 2.33). Mortality rates were 0.91957 yr−1, 0.43654 yr−1and 0.48303 yr−1 for total, natural and fishing mortality respectively. The currently exploitation rate E = 0.53. The length at first capture (Lc) as 17.0cm, (2.34 year)). The results of age at first capture and the current exploitation rate indicated that the small fish are caught at higher fishing effort level. Since these fish represent a percentage of the total catch in the Mediterranean Sea coast of Sinai and low price of this fish to some extent is an alternative to fish such as sea bream and sea bass, which are very high prices and also there is no previous studies on these fish,
So you should do the following studies on this type of fish to know in the Spawning season and the length at first maturity of these fish and distribution and feed habitat so that fish can be managed catch and work to increase the production of these fish while preserving the stock of fish
