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.
| Published in |
American Journal of Life Sciences (Volume 3, Issue 6-1)
This article belongs to the Special Issue New Horizons in Basic and Applied Zoological Research |
| DOI | 10.11648/j.ajls.s.2015030601.11 |
| Page(s) | 1-6 |
| Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
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Copyright © The Author(s), 2015. Published by Science Publishing Group |
Gulf of Suez, Red Sea, Rogadius asper, Age & Growth, Demographic Structure
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APA Style
Manal Sabrah, Amal Amin, Aly El Sayed. (2015). 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, 3(6-1), 1-6. https://doi.org/10.11648/j.ajls.s.2015030601.11
ACS Style
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. Am. J. Life Sci. 2015, 3(6-1), 1-6. doi: 10.11648/j.ajls.s.2015030601.11
AMA Style
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. Am J Life Sci. 2015;3(6-1):1-6. doi: 10.11648/j.ajls.s.2015030601.11
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Download@article{10.11648/j.ajls.s.2015030601.11,
author = {Manal Sabrah and Amal Amin and Aly El Sayed},
title = {Age, Growth and Demographic Structures of Thorny Flathead Rogadius asper, Cuvier, 1829 (Pieces: Platycephalidae) from the Coastal Waters of the Suez Gulf},
journal = {American Journal of Life Sciences},
volume = {3},
number = {6-1},
pages = {1-6},
doi = {10.11648/j.ajls.s.2015030601.11},
url = {https://doi.org/10.11648/j.ajls.s.2015030601.11},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajls.s.2015030601.11},
abstract = {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.},
year = {2015}
}
TY - JOUR T1 - Age, Growth and Demographic Structures of Thorny Flathead Rogadius asper, Cuvier, 1829 (Pieces: Platycephalidae) from the Coastal Waters of the Suez Gulf AU - Manal Sabrah AU - Amal Amin AU - Aly El Sayed Y1 - 2015/09/02 PY - 2015 N1 - https://doi.org/10.11648/j.ajls.s.2015030601.11 DO - 10.11648/j.ajls.s.2015030601.11 T2 - American Journal of Life Sciences JF - American Journal of Life Sciences JO - American Journal of Life Sciences SP - 1 EP - 6 PB - Science Publishing Group SN - 2328-5737 UR - https://doi.org/10.11648/j.ajls.s.2015030601.11 AB - 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. VL - 3 IS - 6-1 ER -
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