ديناميكية مجموعة الربيان Penaeus semisulcatus De Haan المستغلة بالأسطول الصناعي في منطقة منفية، بالمملكة العربية السعودية، على الخليج العربي

Abstract EN

In the territorial waters of Saudi Arabia on the Arabian Gulf shrimping grounds exploited by the industrial fleet is located off Manifa, and the study showed that Penaeus semisulcatus is the dominant species in the area constituting 91 % of the total shrimp catch.

A prominent segregation in size between males and females in favor of females that showed allometric growth in weight relative to length (b = 3.432).

Results also showed that the growth rate in Manifa is superior to that is known in other locations in the Gulf for the same species.

Von Bertalanffy growth constants were estimated as L∞ = 66.15mm (CL), W∞ = 67.96 gm, k = 1.2yr-1 and t0 = -0.10583yr.

The growth performance coefficient (ø' = 3.7202) indicated that hydrographic conditions in Manifa are suitable for this species.

Mortality coefficients showed that the shrimp population in Manifa is exploited at high rates (73 %).

From the estimation of the probability of capture by the industrial shrimp trawls L50 was found equal to 32.32mm (CL), which is much lower than the recruitment size of 42mm (CL) that occur in August.

From the application of a VPA model it was concluded that it is imperative to delay the starting date of the fishing season and to reduce fishing effort by about 20 % in order to increase the percentage of large size shrimp and improve the quality of the landed catch.