Brief Assessment of Stock of Mud Crabs &lt;i&gt;Scylla&lt;/i&gt; spp. in Matang Mangrove Forest, Malaysia and Proposal for Resources Management

Kosuge, Takeharu

doi:10.6090/jarq.35.145

Cited by 19 publications

(9 citation statements)

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“…Overfishing of the mud crabs, Scylla species, has been observed at varying levels in different countries as both national and international markets have developed, with resulting decreases in both size and abundance of mud crabs in many fisheries (Angell 1992;Overton et al 1997;Kosuge 2001). Furthermore, since the late 1990s, as interest in aquaculture of mud crabs was increasing throughout Asia, all forms of mud crab culture have depended on collection of natural seed (Overton et al 1997).…”

Section: Introductionmentioning

confidence: 99%

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

Lebata

Vay

Walton

et al. 2009

Mar. Freshwater Res.

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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 hatcherybred 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.

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Section: Introductionmentioning

confidence: 99%

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

Lebata

Vay

Walton

et al. 2009

Mar. Freshwater Res.

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“…This earlier finding is in wide contrast to this study. However, 80% of the mud crabs sampled by Kosuge (2001) were immature. This could have led to misidentification.…”

Section: Discussionmentioning

confidence: 99%

“…However, there may be other underlying reasons, which cannot be pinpointed based on present knowledge. A study by Kosuge (2001) reported that out of 81 individuals, more than 60% of mud crab species sampled from the Matang Mangrove Forest Research off the Straits of Malacca were S. serrata while S. olivacea made up the remaining samples (no S. paramamosain and S. tranquebaria were reported). This earlier finding is in wide contrast to this study.…”

Section: Discussionmentioning

confidence: 99%

Phylogenetic relationships within the Scylla (Portunidae) assessed by the mitochondrial DNA sequence

2017

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Rosly HAAM, Mohd Nor SA, Md. Naim D. 2017. Phylogenetic relationships within the Scylla (Portunidae) assessed by the mitochondrial DNA sequence. Biodiversitas 18: 1696-1704. This study was centered around the phylogenetic of mud crab genus Scylla collected across Malaysia based on a 542 base pairs (bp) section of the mitochondrial cytochrome c oxidase I (COI) from 201 individuals. Sampling locations were nine areas including one location from Borneo (Sabah and Sarawak). The Maximum Parsimony (MP) and Neighbor-Joining (NJ) methods was conducted for phylogenetic analysis and performed in MEGA ver. 5.05. We found that S. olivacea is the plenteous species collected with 111 individuals, followed by S. tranquebarica with 61 individuals. Scylla paramamosain is barely found throughout our sampling locations with only 29 individuals caught in this study. Regrettably, no wild samples of S. serrata was found during our sampling occasions, accordingly life specimens were purchased from restaurants to complete the analysis. Both MP and NJ phylogenetic trees shows a monophyletic relationships among all four species within genus Scylla included in this study. This was also supported by the genetic distance analysis based on Tamura-Nei which indicates that there is high interspecific and low intraspecific genetic distances among and within species of Scylla included in the analysis. This investigation divulged a solid proof that supports the occurrence of three species of Scylla with the nonappearance of S. serrata in Malaysian waters. This current investigations could serve as a guidance for promoting further assessment on aquaculture and conservation management for the species.

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“…Preservation of spermatophores for long periods would be a further advantage for future breeding programs (Memon et al 2012a(Memon et al , 2012b(Memon et al , 2011. The current size and quantities of crab 'seed' caught by fishermen are not sufficient to meet demand (Kosuge 2001). Off season spawning can be induced in cultured species, but the techniques are cost intensive.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Cryoprotectants and Sperm Densities of Orange Mud Crab, Scylla olivacea (Herbst, 1796) for Long-Term Storage of Spermatozoa

Ikhwanuddin¹,

Yin²,

Menon³

et al. 2015

JSM

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Brief Assessment of Stock of Mud Crabs <i>Scylla</i> spp. in Matang Mangrove Forest, Malaysia and Proposal for Resources Management

Cited by 19 publications

References 0 publications

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

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

Phylogenetic relationships within the Scylla (Portunidae) assessed by the mitochondrial DNA sequence

Effect of Different Cryoprotectants and Sperm Densities of Orange Mud Crab, Scylla olivacea (Herbst, 1796) for Long-Term Storage of Spermatozoa

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