STUDY OF SOME BIOLOGICAL AND DYNAMIC CHARACTERISTICS OF THE MEDEIRAN SARDINELLA FISH SARDINELLA MADERENSIS OF EASTERN MEDITERRANEAN (NORTH SINAI COAST EGYPT)

Document Type : Researches

Authors

1 Dept. Fisheries and Aquaculture, Fac. Environ. Agric. Sci., Arish Univ., Egypt.

2 Nat. Inst. Oceanography and Fisheries, Egypt.

Abstract

Monthly collected samples of S. maderensis from January to December 2021 in Mediterranean coast of Sinai for determination the growth and  mortality. The lengths raged from 8.5 - 26.3 cm and the weights ranged from 5g to 171g. Value b of the relationship between length-weight was 3.0524 thus, the growth of S. maderensis categorized as displaying isometric growth. (VBGP) of L∞, (k) and (t0) were 30.39cm, 0.2937 and -0.6049/year, respectively. The growth performance index (Ø') was 2.334. GSI ranged from 0.11 to 2.6 of males and ranged from 0.19 to 3.4 of females, also the peak spawning periods of S. maderensis were the period from April to September. The lengths at first maturity were 15.5 cm (males), 16.7 cm (females) and 16.0 cm for combined sexes. Values of total mortality (Z), natural mortality (M), fishing mortality (F) and exploitation rate (E) of combined sexes of S. maderensis were 0.7124 ,0.3229, 0.3895 year-¹ and 0.547, respectively. Length at first capture L50 was 13.5 cm. Should be not increase the fishing effort but should be increasing the size of the nets so that the length at first capture increases from 13.0 cm to 16.0 cm in order to equal the length at first maturity to preserve the stock of these fish.

Keywords

Main Subjects

Sinai Journal of Applied Sciences
Volume 12, Issue 3
May and June 2023
Pages 433-444

Files

Share

How to cite

Statistics