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Evaluation of hatchery-based enhancement of the mud crab, Scylla spp., fisheries in mangroves: comparison of species and release strategies

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Date
2009
Author
Lebata, Ma. Junemie Hazel L.
Le Vay, Lewis
Walton, Mark E.
Biñas, Joseph B.
Quinitio, Emilia T.
Rodriguez, Eduard M.
Primavera, Jurgenne
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Abstract
Ranching, stock enhancement and restocking are management approaches involving the release of wild or hatchery-bred organisms to enhance, conserve or restore fisheries. The present study, conducted from April 2002 to November 2005, evaluated the effectiveness of releasing wild and hatchery-reared (HR) mud crabs in the mangroves of Ibajay, Aklan, Philippines where preliminary studies demonstrated declining fishery yields, abundance and size of crabs. Comparison of survival and growth of wild-released and HR Scylla olivacea and HR Scylla serrata demonstrated the effect of nursery conditioning, size-at-release and species differences. Overall yield and catch per unit effort (CPUE) increased by 46% after stock enhancement trials. Recapture rates of released crabs were highest in wild-released S. olivacea and in crabs measuring 65.0–69.9 mm carapace width (CW) and lowest in non-conditioned HR S. serrata. Growth rates were highest for conditioned HR S. olivacea and lowest for conditioned HR S. serrata (11.7 and 3.7 mm month-1 respectively). Fishing mortality was highest for S. olivacea, whereas natural mortality was greater for S. serrata. Conditioning hatchery-bred animals before release is also important in obtaining higher survival. S. olivacea was the more appropriate of the two species for release in mangrove habitats inundated with low-salinity water. However, there is a need for site-specific studies to evaluate the effectiveness of releases.
URI
http://hdl.handle.net/10862/2095
Suggested Citation
Lebata, M. J. H. L., Le Vay, L., Walton, M. E., Biñas, J. B., Quinitio, E. T., Rodriguez, E. M., & Primavera, J. (2009). Evaluation of hatchery-based enhancement of the mud crab, Scylla spp., fisheries in mangroves: comparison of species and release strategies. Marine and Freshwater Research, 60(1), 58-69.
DOI
10.1071/MF08155
Subject
Hatcheries; growth rate ASFA; stocking (organisms) ASFA; Crab fisheries; Nursery grounds; Depleted stocks; marine crustaceans ASFA; Mangroves; fishing ASFA; Mortality; Abundance; Fisheries; Survival; Habitat; Ranching; Mud; fishing ASFA; Decapoda; Scylla; Scylla serrata; Scylla olivacea
Taxonomic term
Scylla serrata
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