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Fisheries studies and stock evaluation of shrimp scad,Alepes djedaba(Teleostei:Carangidae)caught from Arabian Gulf

Journal of Coastal Life Medicine 2014年第3期 203-208页

作者： Medhat Abdel Barr Amany Mohammed Osman Hayam Abdulla Al Abdulhadi Oceanography Department Faculty of ScienceAlexandria UniversityEgypt Biological Sciences Department Rabigh college of Science and ArtKing Abdulaziz UniversityP.O.box 344Rabigh 21911Saudi Arabia Faculty of Science Dammam UniversitySaudi Arabia

Objective:To evaluate the stock of Alepes djedaba(***)by describing the length composition,growth parameters,mortality rates of *** captured in Arabian Gulf off Saudi Arabia and adopting yield per recruit and biomass per recruit ***:A random sample of 490 fish representing a moderate range of total lengths(16.5-32.4cm)and weights(60-410 g)were sampled in Arabian Gulf off Dammam,Saudi Arabia during the period from August 2008 to July ***5 software was used for estimation of growth *** mortality was calculated using the length converted catch *** mortality was estimated using Pauly and David's *** mortality was computed by subtracting natural mortality from total *** recruit analysis was made using Beverton and Holt ***:length-frequency analysis revealed four peaks and the length range from 22 cm to 27 cm dominated the catch,constituting about 71%of the *** of the von Bertalanffy growth parameters were computed using LFD5 software as follows:the asymptotic length(L_(∞))=41.71 cm,curvature parameter(K)=0.36 year^(-1),and hypothetic age at zero length(t_(0))=-0.76 *** total mortality(Z)was estimated as 2.07 year^(-1),and natural mortality was 0.8 year^(-1).Fishing mortality F=1.27 year^(-1),which was higher than F_(0.1)(0.3 year^(-1)),F_(SB(50))(0.59 year^(-1))and FS_(B(40))(0.86 year^(-1)).Atthe current levels of fishing and natural mortality,the biomass per recruit is 34%of the virgin ***:These may indicate an overexploitation state of the fisheries of *** in Arabian Gulf.

关键词： length frequency Growth parameters Mortality rates Per recruit analysis Shrimp scad

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