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Stock Assessment of Blue Swimming Crab Portunus pelagicus (Linnaeus, 1758) from Pakistani Waters (Northern, Arabian Sea)
Afzaal, Zainab; Kalhoro, Muhsan Ali; Buzdar, Muhammad Aslam; Nadeem, Ashraf; Saeed, Faisal; Haroon, Ameena; Ahmed, Irfan; Kalhoro, MA (reprint author), Lasbela Univ Agr Water & Marine Sci, Fac Marine Sci, Uthal, Balochistan, Pakistan.; Kalhoro, MA (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Res Ctr Remote Sensing Marine Ecol & Environm, Guangzhou, Guangdong, Peoples R China.
2016
Source PublicationPAKISTAN JOURNAL OF ZOOLOGY
Volume48Issue:5Pages:1531-1541
AbstractLength frequency distribution data of blue swimming crab Portunus pelagicus (Linnaeus, 1766) from Pakistani waters were used to estimate the growth and mortality parameters during 2015. The combined length frequency data of P. pelagicus were n=1459. The data were measured in carapace width (CW) in cm. The analyses were based on FiSAT stock assessment computer software package. The von Bertalanffy growth function parameters CW infinity=17.85 cm (CW) and K=1.700 year(-1) (using ELEFAN method) and the to value was calculated at -0.975. Based on the VBGF growth parameters the total, natural and fishing mortality were calculated at 4.60, 1.684 and 2.915 year(-1), respectively. The yield per recruit described that when t(c) was assumed to be 2, F-max was estimated 2.2 and F-0.1 as 3 and when t(c) was assumed to be 1, F-max as estimated at 2.15 and F-0.1 at 3. Currently we assume that the age of fish t(c) at first capture is about 1 year and F-current was 2.915, therefore F-current was greater than F-0.1 and F-max which shows that the current status of blue swimming crab is in overexploitation state. Furthermore, when using Guland (1971) biological reference points F-opt was equal to M (1.685) the current fishing mortality rate is 2.915 was greater than biological reference point. The exploitation rate (E) was calculated at 0.633. In the light of above results we may assume that the P. pelagicus fishery from Pakistani waters are was in overexploited state. We may recommend that some management steps should be taken to maintain the blue swimming crab fishery stock from Pakistani waters for the future.
Department[Afzaal, Zainab; Kalhoro, Muhsan Ali; Buzdar, Muhammad Aslam; Nadeem, Ashraf; Saeed, Faisal; Haroon, Ameena; Ahmed, Irfan] Lasbela Univ Agr Water & Marine Sci, Fac Marine Sci, Uthal, Balochistan, Pakistan; [Kalhoro, Muhsan Ali] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Res Ctr Remote Sensing Marine Ecol & Environm, Guangzhou, Guangdong, Peoples R China ; LTO
KeywordBlue Swimming Crab Stock Assessment Mortality Overexploitation
Subject AreaZoology
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15245
Collection热带海洋环境国家重点实验室(LTO)
Corresponding AuthorKalhoro, MA (reprint author), Lasbela Univ Agr Water & Marine Sci, Fac Marine Sci, Uthal, Balochistan, Pakistan.; Kalhoro, MA (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Res Ctr Remote Sensing Marine Ecol & Environm, Guangzhou, Guangdong, Peoples R China.
Recommended Citation
GB/T 7714
Afzaal, Zainab,Kalhoro, Muhsan Ali,Buzdar, Muhammad Aslam,et al. Stock Assessment of Blue Swimming Crab Portunus pelagicus (Linnaeus, 1758) from Pakistani Waters (Northern, Arabian Sea)[J]. PAKISTAN JOURNAL OF ZOOLOGY,2016,48(5):1531-1541.
APA Afzaal, Zainab.,Kalhoro, Muhsan Ali.,Buzdar, Muhammad Aslam.,Nadeem, Ashraf.,Saeed, Faisal.,...&Kalhoro, MA .(2016).Stock Assessment of Blue Swimming Crab Portunus pelagicus (Linnaeus, 1758) from Pakistani Waters (Northern, Arabian Sea).PAKISTAN JOURNAL OF ZOOLOGY,48(5),1531-1541.
MLA Afzaal, Zainab,et al."Stock Assessment of Blue Swimming Crab Portunus pelagicus (Linnaeus, 1758) from Pakistani Waters (Northern, Arabian Sea)".PAKISTAN JOURNAL OF ZOOLOGY 48.5(2016):1531-1541.
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