ESTIMATION OF YIELD PER RECRUIT OF Solea solea (LINNAEUS, 1758) IN LAKE BARDA WIL, EGYPT.

ESTIMATION OF YIELD PER RECRUIT OF Solea solea
(LINNAEUS, 1758) IN LAKE BARDA WIL, EGYPT.
By
F. I. EL-GAMMAL”, S. GR. EL-ETREBY and M.M. MAHMOUD
“National Institute of Oceanography and Fisheries, Suez, Egypt”
Key Words: Yield Per Recruit, solea, in Lake Bardawil.
ABSTRACT
Ihe total mortality coefficient “Z”, natural mortality coefficient “m” and
fishing mortality coefficient ”F” of males, females and sexes combined of
Solea solea in Lake Bardawil were estimated. The obtained results indicated
that males are characterized by a higher values of “Z”, ”M” and ”i”. The·
, yield per recruit estimates showed that the present level offishing mortality

coefficient (F = 1.054 per year) is nearly the same as the fislJiniJ. ~ortality

coefficient which produce the maximum yieldper recmit. The effect ofnatural

mortality coefficient and age at first capture on the yield per recruit were

estimated and discussed