Multivariate analysis of the mud crab Scylla serrata (Brachyura: Portunidae) from four locations in Southeast Asia

Overton, Julia Lynne; Macintosh, D. J.; Thorpe, Roger S.

doi:10.1007/s002270050068

Cited by 59 publications

(39 citation statements)

References 12 publications

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“…Mud crab, Scylla serrata (Forskal) is the only species of the family Portunidae inhabiting the mangroves of the tropical latitudes particularly Indo-Pacific (Hill, 1975;Overton et al, 1997) and subtropical environments of China and Japan (Sakai, 1976;Dai and Yang, 1991), having tolerance to a wide range of environmental variations. It ranks first among crabs because of its large size, high meat quality, delicate taste (Rattanachote and Dangwatanakul, 1992).…”

Section: Introductionmentioning

confidence: 99%

Body Weight, Carapace Length and Width Relationship and Condition Factor of the Mud Crab Scylla serrata (Forskal) in Mangrove Ecosystem

2017

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The relationship of length-weight and width-weight of the carapace and the relative condition factor of mud crab Scylla serrata from Coringa Wildlife Sanctuary (Andhra Pradesh, India) was the subject of present study. Significant difference in both males and females was observed between carapace length-weight and carapace width-weight, with a linear relationship.The regression values of both genders were found to be statistically significant. The regression equations calculated for lengthweight were W = 0.00000178 L 3.1139 (r = 0.95) for males, W = 0.00000520 L 2.8056 (r = 0.94) for females and for genders combined it was W = 0.0000297 L 2.9891 (r = 0.94). In case of carapace width-weight relationship of males, females and genders combined the regression equations were W = 0.00000121 CW 3.0426 (r = 0.92), W = 0.00000178 CW 2.775 (r = 0.93) and W = 0.00000204 CW 2.9210 (r = 0.92) respectively. The male crabs showed positive allometric growth, whereas females had negative allometric growth. Analysis of covariance confirmed remarkable difference between males and females in the growth pattern. The mean relative condition factor (Kn values) of both males and females and of the pooled genders ranged from 0.680 (April) to 1.029 (November). A gradual raise in Kn values was observed from small-to big-sized crabs in both genders. Peak values were observed in 12.0-13.9 cm size group in November.

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Section: Introductionmentioning

confidence: 99%

Body Weight, Carapace Length and Width Relationship and Condition Factor of the Mud Crab Scylla serrata (Forskal) in Mangrove Ecosystem

2017

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“…It is caught with traps, by commercial and artisanal fisheries (Chitravadivelu 1994, Overton et al 1997. Because they are fairly ubiquitous and abundant in estuaries and mangrove swamps, mud crabs are readily available to coastal fishers (Macnae 1968, Hirata 1991, Overton et al 1997.…”

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confidence: 99%

Fishery characteristics and abundance estimates of the mangrove crab Scylla serrata in southern Tanzania and northern Moçambique

Barnes¹,

Dulvy²,

Priestley³

et al. 2002

South African Journal of Marine Science

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“…Morphological measurements were determined following Overton et al (1997) and Keenan et al (1998), as shown in Fig. 1.…”

Section: Morphometric Analysismentioning

confidence: 99%

“…Mud crabs are a valuable component of many coastal fisheries in southeast Asia (Overton et al 1997;Keenan 1999;Le Vay 2001;Walton et al 2006). All size classes of crabs, from juveniles for pond culture to mature crabs for premium markets, are subject to heavy fishing pressure in Asia.…”

Section: Introductionmentioning

confidence: 99%

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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Multivariate analysis of the mud crab Scylla serrata (Brachyura: Portunidae) from four locations in Southeast Asia

Cited by 59 publications

References 12 publications

Body Weight, Carapace Length and Width Relationship and Condition Factor of the Mud Crab Scylla serrata (Forskal) in Mangrove Ecosystem

Body Weight, Carapace Length and Width Relationship and Condition Factor of the Mud Crab Scylla serrata (Forskal) in Mangrove Ecosystem

Fishery characteristics and abundance estimates of the mangrove crab Scylla serrata in southern Tanzania and northern Moçambique

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

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