The biology of the smooth swim crab, Portunus validus (Herklots) off Lagos coast, Nigeria.

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dc.contributor.authorLawal-Are, A. O.
dc.contributor.authorBilewu, B.
dc.date.accessioned2019-09-27T07:29:43Z
dc.date.available2019-09-27T07:29:43Z
dc.date.issued2009
dc.description.abstractThe size composition, growth pattern, food and feeding habits, fecundity and sex ratio of the smooth swim crab, Portunus validus (Herklots) off the Lagos Coast, Nigeria were investigated. The carapace length of the 618 specimens examined ranged between 4.5cm and 11.4cm (carapace width 9.2cm to 19.5cm) and weighed 82.3g to 694.0g. The crabs exhibited negative allometric growth in both sexes. There was high correlation between carapace width and body weight of the crabs with correlation coefficient (r) ranging between 0.889 and 0.911. The condition factor ranged between 3.78 and 5.46 with a mean of 4.85. The condition factor decreased with increase in crab size. The crabs fed mainly on fishes, molluscs, crustaceans, plant parts and algae. There were distinct differences in the feeding habits in relation to size. The small crabs fed mainly on shrimp appendages while larger crabs fed mostly on fishes and molluscs. The sex ratio was 1: 2.2 which was significantly different from the expected 1: 1 ratio. The fecundity ranged between 806,000 and 6,240,000. The average fecundity was 2,200,310. The egg diameter ranged from 0.28mm to 0.45mm. The mean egg diameter was 0.34mm.en_US
dc.identifier.citationCited by 22 Related articles All 2 versionsen_US
dc.identifier.urihttps://ir.unilag.edu.ng/handle/123456789/6171
dc.subjectdistributionen_US
dc.subjectfeeding hablten_US
dc.subjectgrowth patternen_US
dc.subjectcarapace lengthen_US
dc.subjectLagos Coasten_US
dc.subjectPortunus validusen_US
dc.titleThe biology of the smooth swim crab, Portunus validus (Herklots) off Lagos coast, Nigeria.en_US
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