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vol-37Population dynamics of Por’
s Goatfish (Upeneus pori Ben-Tuvia and
Golani, 1989) inhabiting Red Sea, Egypt
Amal Mohamed Mahmoud Amin
National Institute of Oceanography and Fisheries, Suez branch, p,o .Box 182 Suez Egypt.
E-mail: Aminamal30@yahoo
Received 7th Jun 2011, Accepted 29th December 2011
Abstract
The present work intended to estimate the basic parameters required for the management of the porُs goatfish in the
Red Sea age composition, growth parameters, sex ratio, length at first sexual maturity, mortality exploitation rate,
relative yield per recruit, and relative biomass per recruit of por’s goatfish (Upeneus pori) caught from the Red Sea
was studied .Females and males made up 43.47% and 56.53%, respectively, of the population of this species. The
total length of females ranged from 8.0cm to 16.5 cm and from 6.3cm to 17.5cm for males. The length-weight
relationship for combined sexes was estimated as W=0.012* L2.926.The age estimated from length frequency data
were used to estimate the growth parameters of the von Bertalanffy equation. The estimated parameters were: L∞
=18.73 cm, K=0.501and t◦ =-1.38.The maximum age was three years. The 2-year age group was dominant. Females
reached sexual maturity at a total length of 10.7 cm while males matured at a total length of 10.5 cm .The annual
rates of total ,natural and fishing mortalities were calculated as 1.72, 0.501 and 1.219 year–1, respectively. In
addition to this, it was found that the exploitation rate on the Upeneus pori in the Red Sea was 0, 71.
Keywords: Red Sea por’s goatfish; length at first sexual maturity; mortality; exploitation rate; relative
yield per recruit, and relative biomass per recruit.
