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

Lebata, Ma. Junemie Hazel L.; Vay, Lewis Le; Walton, Mark; Biñas, Joseph B.; Quinitio, Emilia T.; Rodriguez, Eduard M.; Primavera, Jurgenne H.

doi:10.1071/mf08155

Cited by 33 publications

(28 citation statements)

References 27 publications

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“…The cost-effective production of juvenile crabs also opens up the potential for stock enhancement based on hatchery releases; mud crabs are attractive species for stock enhancement in mangrove fisheries due to their post-recruitment habitat fidelity and rapid growth rates. This has been confirmed in initial trials that have demonstrated high recapture rates and positive effects on yield in localised artisanal fisheries (Le Vay et al 2008;Lebata et al 2009). Lebata et al (2009) reported that survival to recapture of hatchery-reared mud crabs that had been held in ''conditioning'' earthen brackish water nursery ponds for a month prior to release was almost four times greater than for crabs that had not been conditioned before release.…”

Section: Introductionmentioning

confidence: 64%

“…This has been confirmed in initial trials that have demonstrated high recapture rates and positive effects on yield in localised artisanal fisheries (Le Vay et al 2008;Lebata et al 2009). Lebata et al (2009) reported that survival to recapture of hatchery-reared mud crabs that had been held in ''conditioning'' earthen brackish water nursery ponds for a month prior to release was almost four times greater than for crabs that had not been conditioned before release. Similarly, in pond-rearing trials, hatchery-reared Scylla paramamosain may be out-competed by wild-collected seed crabs .…”

Section: Introductionmentioning

confidence: 64%

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Phenotypic differences between hatchery-reared and wild mud crabs, Scylla Serrata, and the effects of conditioning

2010

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Hatchery-reared animals for stock enhancement should be competent to survive and grow at rates equivalent to those of wild conspecifics. However, morphological differences are often observed, and pre-conditioning steps may be required to improve the fitness of hatchery-reared juveniles prior to release. In the present study, hatchery-reared Scylla serrata juveniles were reared either individually (HR-solitary) or groups in tanks (HR-communal), the latter group being exposed to intraspecific competition and foraging for food. After 21 days, both groups were compared to similar size wild-caught juveniles in terms of morphometric measurements of carapace spination, abnormalities and carapace colouration. There were some limited significant differences between HR-communal crabs and HR-solitary crabs in terms of length of 8th and 9th lateral spines and in body-weightcarapace width ratio, but both treatments differed from wild crabs, which were heavier and had longer carapace spines for their size. In contrast, both HR treatments exhibited common abnormalities including deformities in the shape of the abdomen, in particular occurrence of an asymmetrical telson or a deeply folded telson. In all cases, abnormalities persisted through moulting. Initially, carapace colour differed in all measures of colour between HR and wild crabs. However, these differences reduced after a period of 4-8 days of conditioning on coloured tank backgrounds or dark sand or mud backgrounds, without moulting. Similarly, hatchery-reared crabs exhibited very limited burying behaviour on first exposure to sediment, but this increased to levels observed in wild crabs within 2-4 days. Thus, short-term conditioning of hatchery-reared crabs on dark sediments may be effective in increasing predator avoidance and survivorship in released animals, and present results suggest that this can be achieved after relatively short periods of 1 week or less.

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Section: Introductionmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 64%

Phenotypic differences between hatchery-reared and wild mud crabs, Scylla Serrata, and the effects of conditioning

2010

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“…2005 ;Obata et al . 2006 ;Lebata et al . 2009 ) as well as evaluation of other species as candidates for aquaculture (Marshall et al .…”

Section: Technology Developmentmentioning

confidence: 94%

“…Nursery conditioning is also benefi cial in cases where juveniles are reared for restocking into the wild (Davis et al . 2005 ;Lebata et al . 2009 ).…”

Section: Nurserymentioning

confidence: 94%

Mud Crab Aquaculture

Paterson¹

2011

Recent Advances and New Species in Aquaculture

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“…Trial release programmes for enhancing or improving stocks of several severely depleted crab species have been implemented in Asia and North America, using aquaculture techniques as a tool for producing juveniles. Examples are the swimming crab Portunus trituberculatus (Okamoto 2004), the blue crab Callinectes sapidus (Zohar et al 2008), the mud crabs Scylla paramamosain (Ut et al 2007, Liu et al 2011, Scylla olivacea and Scylla serrata (Lebata et al 2009), and the red king crab Paralithodes camtschaticus (Daly et al 2009, 2013, Swingle et al 2013.Maja squinado is a spider crab species restricted to the Mediterranean Sea (Neumann 1998, d'Udekem d'Acoz 1999, Sotelo et al 2008, Sotelo et al 2009, Guerao et al 2011. A re-stocking programme for M. squinado in the western Mediterranean Sea (in particular, the Catalan coast and the Balearic Islands) was carried out during 2006−2010.…”

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confidence: 99%

Larval growth and biochemical composition of the protected Mediterranean spider crab Maja squinado (Brachyura, Majidae)

Rotllant¹,

Guerao²,

Gras³

et al. 2014

Aquat. Biol.

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The spider crab Maja squinado is restricted to the Mediterranean Sea, and as captures of this species became very rare in the last decades, it is a protected species. To improve spider crab production in experimental or commercial hatcheries and allow the future success of restocking programmes, knowledge of larval growth and biochemical characteristics is mandatory. In the present study, larvae from 4 different batches were studied. Larvae were examined to determine the larval instar and moulting stages. In each moulting stage for all larval instars, carapace length, dry weight, ash and proximal composition (protein, carbohydrates and lipids) were measured. Metamorphosis began at 14 d posthatching (dph), with metamorphosis to the first juvenile crabs completed in about 90% of the specimens at 17 dph. Survival dropped from 59. 25 ± 19.53% to 33.49 ± 19.53% between the zoea II and megalopa stages, and only 7.74 ± 1.94% of newly hatched larvae (NHL) reached the first juvenile crab stage. NHL weighed 120.40 ± 18.95 µg, increasing their dry weight and ash content 6-fold after metamorphosis. Dry weight also increased through the moulting cycle in each larval instar, while ash content was higher in early premoult stages. Proximal composition increased between 8-and 6-fold from NHL to megalopa in the premoult stage and then decreased 2-fold during metamorphosis. Lipid and protein content varied among moulting stages from the postmoult to the premoult stages, with more significant alterations seen during the megalopa instar stage.KEY WORDS: Decapoda · Majoidea · Larval instars · Moult stages · Size · Biomass · Protein · Lipids Resale or republication not permitted without written consent of the publisherAquat Biol 20: [13][14][15][16][17][18][19][20][21] 2014 species included in the Action Plan for the Mediterranean (UNEP 1996). The Bern Convention on the conservation of wildlife and natural habitats, opened for signature on 19 September 1979 and ratified by the EU in Strasbourg in 1997, established M. squinado as a species of protected wildlife in the Mediterranean (Anonymous 1999) and its exploitation in Spain is regulated by general courts (Anonymous 1998).Re-stocking is one of the options for allowing depleted stocks to recover. The restocking programmes include plans for evaluating the stock after releasing cultured individuals of the target species, and when recovery is sufficient, limited fisheries can be established in the area (Bell et al. 2008, Lorenzen et al. 2012. Overall, the focus has been on developing methods for mass-producing environmentally fit juveniles and releasing them in ways in which they survive without affecting the ecosystem or genetic diversity of wild stocks. Trial release programmes for enhancing or improving stocks of several severely depleted crab species have been implemented in Asia and North America, using aquaculture techniques as a tool for producing juveniles. Examples are the swimming crab Portunus trituberculatus (Okamoto 2004), the blue crab Callinectes sapidus (Zo...

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

Cited by 33 publications

References 27 publications

Phenotypic differences between hatchery-reared and wild mud crabs, Scylla Serrata, and the effects of conditioning

Phenotypic differences between hatchery-reared and wild mud crabs, Scylla Serrata, and the effects of conditioning

Mud Crab Aquaculture

Larval growth and biochemical composition of the protected Mediterranean spider crab Maja squinado (Brachyura, Majidae)

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