Evaluation of hatchery-based enhancement of the mud crab, Scylla spp., fisheries in mangroves: comparison of species and release strategies
MetadataShow full item record
Cited times in Scopus
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.
Suggested CitationLebata, M. J. H. L., Le Vay, L., Walton, M. E., Biñas, J. B., Quinitio, E. T., Rodriguez, E. M., & Primavera, J. H. (2009). Evaluation of hatchery-based enhancement of the mud crab, Scylla spp., fisheries in mangroves: comparison of species and release strategies.
- AQD 
Showing items related by title, author, creator and subject.
Waiho, Khor; Fazhan, Hanafiah; Quinitio, Emilia T.; Baylon, Juliana C.; Fujaya, Yushinta; Azmie, Ghazali; Wu, Qingyang; Shi, Xi; Ikhwanuddin, Mhd; Ma, Hongyu (Elsevier, 2018)The increasing global demand for mud crabs (genus Scylla) and threats to the wild populations highlight the urgency of fully rearing them in captivity. Despite considerable progress in mud crab production, most crab farms ...
Quinitio, Emilia T.; Parado-Estepa, Fe D.; Huervana, Joana Joy; Burlas, Michael Ray (Aquaculture Department, Southeast Asian Fisheries Development Center, 2015)Widespread interest in mud crab species is increasing because these are highly prized both in domestic and export markets. Among the three mud crab species commonly found in the Philippines, Scylla serrata, S. olivacea, ...