Movement patterns of blue swimming crab Portunus pelagicus in the Sarawak coastal water South China Sea


Citation

Nurfaseha A. H., . and M. Ikhwanuddin, . and A. B. Abol Munafi, . and Shabdin M. L., . Movement patterns of blue swimming crab Portunus pelagicus in the Sarawak coastal water South China Sea. pp. 8-15. ISSN 1823-8556

Abstract

A study was carried out to determine the movement patterns of P. pelagicus within the near-shore marine embayment of the Sarawak coastal water South China Sea. These mark-recapture tagging studies were conducted for about five months from 26th March till 30th August 2005 comprising 48 sampling trips. Out of 976 crabs tagged and released 212 (21.72) were recaptured. The mean distances moved by male and female crabs were 7.36 km 1.78 and 9.15 km 1.87 respectively. The study shows that the female crabs moved significantly (p0.01; p0.05) further than males. The percentage of tagged crabs recaptured within the original release site were 50.0 for male and 45.83 for female crabs. The result shows that the male crabs only significantly (p0.01; p0.05) moved towards the deeper off-shore areas as compared to the near-shore areas. On the other hand the female crabs moved significantly more towards both deeper off-shore and shallow near-shores areas. Most of the tagged crabs were recaptured within the sampling site of 2 km radius after a minimum of 30 days at liberty. The movement activities from the study were not necessarily limited because only 21.72 of the tagged-and-released crabs were recaptured. Thus the main movement activities were attributed to the migration movements associated with reproduction and this can be seen from the tagged crabs with were recaptured at the off-shore deeper water.


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Abstract

A study was carried out to determine the movement patterns of P. pelagicus within the near-shore marine embayment of the Sarawak coastal water South China Sea. These mark-recapture tagging studies were conducted for about five months from 26th March till 30th August 2005 comprising 48 sampling trips. Out of 976 crabs tagged and released 212 (21.72) were recaptured. The mean distances moved by male and female crabs were 7.36 km 1.78 and 9.15 km 1.87 respectively. The study shows that the female crabs moved significantly (p0.01; p0.05) further than males. The percentage of tagged crabs recaptured within the original release site were 50.0 for male and 45.83 for female crabs. The result shows that the male crabs only significantly (p0.01; p0.05) moved towards the deeper off-shore areas as compared to the near-shore areas. On the other hand the female crabs moved significantly more towards both deeper off-shore and shallow near-shores areas. Most of the tagged crabs were recaptured within the sampling site of 2 km radius after a minimum of 30 days at liberty. The movement activities from the study were not necessarily limited because only 21.72 of the tagged-and-released crabs were recaptured. Thus the main movement activities were attributed to the migration movements associated with reproduction and this can be seen from the tagged crabs with were recaptured at the off-shore deeper water.

Additional Metadata

[error in script]
Item Type: Article
AGROVOC Term: Portunus
AGROVOC Term: Portunus pelagicus
AGROVOC Term: Crabs
AGROVOC Term: Aquatic animals
AGROVOC Term: Coastal waters
AGROVOC Term: Animal behaviour
AGROVOC Term: Gills
AGROVOC Term: Body weight
AGROVOC Term: Tagging
AGROVOC Term: Fishermen
Depositing User: Mr. AFANDI ABDUL MALEK
Last Modified: 24 Apr 2025 00:54
URI: http://webagris.upm.edu.my/id/eprint/8729

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