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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. ORCID
Le Vay, Lewis
Walton, Mark E.
Biñas, Joseph B.
Quinitio, Emilia T.
Rodriguez, Eduard M.
Primavera, Jurgenne ORCID
Page views
9,624
Subject
hatcheries ASFA
growth rate ASFA
stocking (organisms) ASFA
crab fisheries ASFA
nursery grounds ASFA
depleted stocks ASFA
marine crustaceans ASFA
mangroves ASFA
fishing ASFA
mortality ASFA
abundance ASFA
fisheries ASFA
survival ASFA
habitats ASFA
ranching ASFA
mud ASFA
Decapoda AGROVOC
Scylla AGROVOC
Scylla serrata AGROVOC
Scylla olivacea AGROVOC
Taxonomic term
Scylla serrata GBIF
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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. https://doi.org/10.1071/MF08155 
DOI
10.1071/MF08155
Type
Article
ISSN
1323-1650; 1448-6059
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  • Journal Articles [1155]

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