GROWTH, MORTALITY AND YIELD PER RECRUIT OF GILTHEAD SEA BREAM, SPARUS AURATA IN BARDAWIL LAGOON, NORTH SINAI, EGYPT

Authors

1 Gen. Auth. Fish Resou. Develop., Arish, Egypt.

2 Dept. Fish. and Aquacul., Fac. Environ. Agric. Sci., Suez Canal Univ., Arish, Egypt.

3 Fac. Agric., Azhar Univ., Cairo, Egypt.

4 Nat. Inst. Oceanography and Fisheries (NIOF), Egypt.

5 Dept. Aquacul., Cent. Lab. Aquacul. Res., Abbassa, Abo-Hammad, Sharkia, Egypt.

Abstract

Growth, mortality and yield per recruit of Gilthead sea bream, Sparus aurata were studied from a small scale fishery of Bardawil lagoon. 2775 specimens ranged between 11.9 to 36.1 cm cm TL and varied from 22 to 651 g total weight, were collected during, 2010. The relationship between length and weight was estimated as W= 0.0248*L2'82Ii .The study showed that there are 6 age groups have been identified by reading the scales and growth rates were calculated in the corresponding lengths for different age groups in a manner back calculation as follows 17.74, 23.25, 27.6, 31.44, 32.85 ad 34.19 at the end of the first year, the second, and sixth, respectively. Age was determined using scales reading technique for 900 individuals and the longevity of this species was found to be 6 years. Growth in length and growth in weight at the end of each year were calculated. The growth parameters of the von Bertalanffy equation were calculated as Loo = 38.04 cm, K = 0.3381 yf and to =~ 0.7933 yr, natural and fishing mortality rates were 0.8420yr", 0.4551 yr~' and 0.3869 yr'1, respectively. The currently exploitation rate (E = 0.4595) indicates that the stock of sea bream in the Bardawil lagoon under exploited. The length at first capture Lc was estimated as 20 cm. The length ai first maturity Lm of males and females were estimated as 20.0 and 24.5 respectively.

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Sinai Journal of Applied Sciences
Volume 2, Issue 2
August 2013
Pages 75-86

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