Age, Growth and Demographic Structures of Thorny Flathead Rogadius asper, Cuvier, 1829 (Pieces: Platycephalidae) from the Coastal Waters of the Suez Gulf
American Journal of Life Sciences
Volume 3, Issue 6-1, November 2015, Pages: 1-6
Received: Jun. 30, 2015; Accepted: Jul. 22, 2015; Published: Sep. 2, 2015
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Manal Sabrah, Fisheries Department - Fisheries Biology Lab. National Institute of Oceanography and Fisheries, Niof, Egypt
Amal Amin, Fisheries Department - Fisheries Biology Lab. National Institute of Oceanography and Fisheries, Niof, Egypt
Aly El Sayed, Fisheries Department - Fisheries Biology Lab. National Institute of Oceanography and Fisheries, Niof, Egypt
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The age and growth of the Olive tail Rogadius asper exploited by the demersal trawl fishery in the Gulf of Suez were investigated during the fishing season 2014/2015. Ageing was done by sagittal otoliths for a sample of 675 ranged from 9.2 to 25.9 cm in total length (TL) with mean of 17.4±2.95 cm. The sex ratio was skewed in favors of females (1.6:1), which tended to high in number and bigger in size than males. The maximum investigated age of females was 4 years and that of males was 3 years. The mean von Bertalanffy growth parameters for both sexes L∞= 26.43±0.22cm and K=0.47±0.03year-1 as estimated by four different methods. According to gender the growth was variable and significantly differed (P˂0.05=0.002). Females attained a greater mean L∞= 27.2±0.44cm than males L∞=24.0±0.26 cm and males displayed greater mean k value 0.53±0.02 year-1 than that of females K=0.43±0.01 year-1. Fish of age groups 1 and 2 years were dominated the age compositions of R. asper constituting 36.6% and 39.3 % respectively. The estimated value of total mortality, natural mortality and fishing mortality for the pooled data was: Z= 1.51±0.25, 0.58±0.09 and 0.93±0.08 year-1 respectively. It was indicated that the fishing mortality was more than one third (37.6%) of the derived natural mortality and exploitation rate was 0.62, indicating that the species was heavily exploited. Although R. asper is not a target species of commercial fisheries, it suffers high exploitation as part of the by-catch for its suitable market price for insufficient income.
Gulf of Suez, Red Sea, Rogadius asper, Age & Growth, Demographic Structure
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Manal Sabrah, Amal Amin, Aly El Sayed, Age, Growth and Demographic Structures of Thorny Flathead Rogadius asper, Cuvier, 1829 (Pieces: Platycephalidae) from the Coastal Waters of the Suez Gulf, American Journal of Life Sciences. Special Issue:New Horizons in Basic and Applied Zoological Research. Vol. 3, No. 6-1, 2015, pp. 1-6. doi: 10.11648/j.ajls.s.2015030601.11
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