Biological studies and assessment of the exploitation status of the green tiger shrimp Penaeus semisulcatus from Jizan area, Red sea

الملخص EN

The present study was undertaken to investigate some biological aspects of the green tiger shrimp Penaeus semisulcatus in order to provide the biological information required for its proper management of the fishery in Jizan area, Red Sea.

Growth parameters were calculated as (L∞ = 94.40; K = 0.81; to = -0.2); maximum age tmax = 3.7037 years; growth performance indices (ØL = 3.86; Øwt = 1.36).

Carapace length at which P.

semisulcatus females attained 50% of maturity was 38 mm.

The annual mortality coefficients were (Z = 3.124 year-1; M = 1.163 year-1 & F = 1.961 year-1).

Carapace length and age at first capture were 35.73 mm and 0.387 year, while carapace length and age at recruitment were 28.52 mm and 0.24 year, respectively.

The length at first sexual maturity was found to be 38 mm, while the carapace length at first capture L50 was estimated as 35.73 mm .This indicates that there is a poor opportunity for the recruits of P.

semisulcatus in Jizan area to spawn before fishing which is considered an important factor that would lead to overexploitation the stock.

The estimated exploitation ratio (0.628) was higher than Emax (0.581) which indicates that, the fisheries status of this species under study is in overexploited.