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Abstract
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Article Information:
Stock Assessment of the Blue Swimmer Crab Portunus pelagicus (Linnaeus, 1766) from the Oman Coastal Waters
Sahar F. Mehanna, Sergey Khvorov, Mansoor Al-Sinawy, Yehia S. Al-Nadabi and Mohamed N. Al-Mosharafi
Corresponding Author: Sahar F. Mehanna
Submitted: June 22, 2012
Accepted: July 28, 2012
Published: February 20, 2013 |
Abstract:
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The stock assessment of the blue swimmer crab, Portunus pelagicus was made based on monthly length frequency data collected from four landing sites along the Oman coasts on both Arabian and Oman Seas from January, 2011 to May, 2012. Age and growth have been estimated from the length-frequency distribution of up to 1000 specimens. Age composition was determined using Bhattacharya's method and the results showed that the maximum life span of P. pelagicus was about 15 months. Bertalanffy (1938) growth parameters didn’t differ significantly between sexes and the obtained values of K were K = 1.85, 1.68 and 1.68 y-1 and CL¥ values were 102.83, 109.57 and 108.46 mm for male, female and sexes combined, respectively. The values of total mortality coefficient (Z), natural mortality coefficient (M) and fishing mortality coefficient (F) were 7.85, 3.15 and 4.7 y-1. The yield per recruit and SSB analysis showed that the crab stock is being exploited beyond its maximum biological limit, but the increasing of fishing mortality to the level which gives the maximum Y/R (83% of its current value) will accompanied with a negligible increase in Y/R (2.7%) and a considerable decrease in both biomass per recruit (21.1%) and spawning stock biomass (37.6%).
Key words: Arabian sea, Oman sea, population dynamics, portunidae, Portunus pelagicus, rational exploitation, stock assessment
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Cite this Reference:
Sahar F. Mehanna, Sergey Khvorov, Mansoor Al-Sinawy, Yehia S. Al-Nadabi and Mohamed N. Al-Mosharafi, . Stock Assessment of the Blue Swimmer Crab Portunus pelagicus (Linnaeus, 1766) from the Oman Coastal Waters. International Journal of Fisheries and Aquatic Sciences, (1): 1-8.
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ISSN (Online): 2049-842X
ISSN (Print): 2049-8411 |
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