Critical lengths, mortality rates and relative yield per recruit of the common sole Solea solea from the Egyptian Mediterranean coast off Alexandria

Document Type : Original Article

Authors

1 Fish Population Dynamics Lab, National Institute of Oceanography and Fisheries, Egypt

2 Marine Sciences Department, Faculty of Science, Port Said University, Egypt.

Abstract

Mortality rates of the common sole Solea solea from Alexandria were estimated
based on the von Bertalanffy growth parameters obtained by the same authors as L∞
= 34.77cm; K= 0.55 year−1 and t0 = 0.07 years for males, L∞ = 36.24 cm; K= 0.63
year−1, t0 = -0.01 years for females and L∞ =35.1 cm; K= 0.58 year−1 and t0 = 0.003
years for sexes combined during two fishing seasons (2011-2013). The total, natural
and fishing mortalities were 2.09, 0.52 and 1.57 year−1 respectively for males, 1.75,
0.53 and 1.22 year−1 respectively for females and 1.7, 0.52 and 1.18 year−1
respectively for sexes combined. Correspondingly, the exploitation ratio was E =
0.75, 0.7 and 0.69/y for males, females and sexes combined respectively. The
estimated length at first capture Lc was 15.97, 12.72 and 14.22 cm for males, females
and sexes combined, respectively while the length at first maturity Lm was 15.31,
15.87 and 15.98 cm for males, females and sexes combined, respectively. These
results reflect the high level of the exploitation. The relative yield per recruit analysis
showed that the stock of S. solea is over exploited and needs urgent management
regulations to conserve this potential fishery.

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