Comparison of Blue Swimming Crab, Portunus pelagicus (Linnaeus, 1758) populations from Batticaloa and Trincomalee areas in Sri Lanka using Morphometric Parameters

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dc.contributor.author Soyza, W.A.D.
dc.contributor.author Senevirathna, J.D.M.
dc.contributor.author Liyanage, N.P.P.
dc.contributor.author Jayamanne, S.C.
dc.date.accessioned 2019-07-04T08:43:38Z
dc.date.available 2019-07-04T08:43:38Z
dc.date.issued 2018
dc.identifier.isbn 9789550481194
dc.identifier.uri http://erepo.lib.uwu.ac.lk/bitstream/handle/123456789/1387/60-2018-Comparison%20of%20Blue%20Swimming%20Crab%2c%20Portunus%20pelagicus%20%28Linnaeus%2c%20.pdf?sequence=1&isAllowed=y
dc.description.abstract Western, Northern and Eastern areas of Sri Lanka are famous for blue swimming crab fishery. However, very limited studies have been carried out to identify their population structure. This study investigated the utility of morphological characters to differentiate Portunus pelagicus populations of two different areas in eastern province of Sri Lanka. Samples were collected from Batticaloa (n=46) and Trincomalee (n=46) waters throughout its known geographic range. Twelve morphometric characteristics were measured up to nearest 0.01 mm. Discriminant Function Analysis (DFA) was performed to analyze significant intra-specific variations of two populations using standardized morphometric characteristics. The derived single discriminant function was totally accounted for 100% variance (Wilks' Lambda=0.74, P<0.05). The carapace width to carapace length ratio (CW2/CL) was recorded the highest canonical discriminant function coefficient (0.89), thus CW2/CL was selected as the most suitable parameter for the predicted model. The two centroids derived by DFA were 0.59 and (-0.59) respectively for the Trincomalee and Batticaloa, and predict the separation of two groups. According to the plotted graph, minimal overlapping between two groups was observed with possible variation between two populations. Two different allometric coefficients (b) were recorded as 2.92 (closer to isometric growth) and 2.76 (negative allometric growth) for Trincomalee and Batticaloa populations respectively. Hence, the results suggest that there is a possibility of having two P. pelagicus stocks in the 2 sites of the eastern part of the island. Changes of prevailing environmental conditions and habitat are the factors that lead to morphological differences of two P. pelagicus populations. Finding of this study is important for implementations of site-specific sustainable fishery management programs. Further, population genetic studies are recommended to confirm the results of the present study. en_US
dc.language.iso en en_US
dc.publisher Uva Wellassa University of Sri Lanka en_US
dc.subject Agriculture en_US
dc.subject Aquaculture and Fisheries en_US
dc.title Comparison of Blue Swimming Crab, Portunus pelagicus (Linnaeus, 1758) populations from Batticaloa and Trincomalee areas in Sri Lanka using Morphometric Parameters en_US
dc.title.alternative International Research Conference 2018 en_US
dc.type Other en_US


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