Estimated Size at Sexual Maturity for Female Mud Crabs (Genus Scylla) From Two Sympatric Species Within Ban Don Bay, Thailand

Overton, Julia Lynne; Macintosh, D. J.

doi:10.1651/0278-0372(2002)022[0790:esasmf]2.0.co;2

Cited by 26 publications

(30 citation statements)

References 15 publications

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“…In South Africa, 50% of S. serrata males sampled in the estuary with a mean size of 9.2 cm CW were found to have sperm, but mating (based on scars on the first pair of walking legs) occurred only in males ranging from 13.1-17.3 cm CW (Robertson and Kruger 1994). S. serrata females become sexually mature at 11.5-18.7 cm CW (Robertson and Kruger 1994), S. paramamosain at 10.1-13.9 cm CW (Overton and Macintosh 2002), and S. olivacea at 8.3-11.8 cm CW (Le Vay 2001;Overton and Macintosh 2002;Jirapunpipat 2008). The smallest S. serrata males with scars on the sternum and merus of the first walking leg as indicator of mating were about 12.5 cm CW (Knuckey 1996).…”

Section: Discussionmentioning

confidence: 97%

Domestication of the mud crab Scylla serrata

et al. 2010

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The significant decrease in wild mud crab population highlights the need to manage the resources and domesticate crabs. This paper presents the initial results of the domestication of mud crab Scylla serrata aimed at producing good-quality captive broodstock. The analysis of the genetic structure of the base population was done as a prerequisite for domestication. Adult S. serrata from the northern to southern parts of the Philippines (Cagayan, Camarines, Samar, and Surigao) were obtained for genetic diversity analysis and domestication. Analysis of molecular variance showed that differences in the genetic variability between the four populations were not significant. Moreover, no significant deviation from Hardy-Weinberg Equilibrium was observed in each sample population and even in pooled populations. Body weight was positively correlated with the carapace width. Second spawning occurred 41-46 days after the first spawning and 34 days from second to third spawning. However, there was a decrease in the number of zoea in repeat spawnings. Twenty-four first-generation (F 1 ) families were produced from the four sites. The duration from spawning of the base population (P 0 ) to attainment of broodstock size F 1 was 10-14 months. Four second-generation (F 2 ) families were produced after 11-12 months. Up to the F 2 , crabs tested negative for six viruses: white spot syndrome virus, infectious hypodermal and hematopoietic necrosis virus, gill-associated virus, yellow head virus, Taura syndrome virus, and infectious myonecrosis virus. The reproductive performance of P 0 was comparable to the succeeding generations. Several families were obtained from one population in a year. However, due to the cannibalistic behavior of crabs, more space is required for the nursery and grow-out phase. The domestication of S. serrata is the first study done on any mud crab species in the Indo-west Pacific region. The initial results would serve as guide to understand and eliminate the barriers to mud crab domestication. The breeding technology developed from this study will support the production of good-quality seedstock for farming.

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Section: Discussionmentioning

confidence: 97%

Domestication of the mud crab Scylla serrata

et al. 2010

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“…Então, o uso de mais do que um método para determinar o tamanho da maturidade parece ser apropriado, particularmente se estes métodos são utilizados para estipular o tamanho mínimo legal de espécies explotadas comercialmente (HAEFNER, 1990;ALUNNO-BRUSCIA & SAINTE-MARIE, 1998;OVERTON & MACINTOSH, 2002;LEME, 2005).…”

Section: Palavras-chaveunclassified

Maturidade sexual das fêmeas de Callinectes danae (Crustacea, Decapoda, Portunidae) nos estuários dos rios Botafogo e Carrapicho, Itamaracá, PE, Brasil

Barreto

Batista-Leite

Aguiar

2006

Iheringia, Sér. Zool.

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ABSTRACT. Sexual maturity of females of Callinectes danae (Crustacea, Decapoda, Portunidae) in the estuaries of the Botafogo and Carrapicho rivers, Itamaracá, PE, Brazil. Callinectes danae (Smith, 1869) is an important fishery resource in the Botafogo and Carrapicho river estuaries. The aim of this study was to estimate the sexual maturity of C. danae. Specimens were captured between October 2003 and June 2004 with the aid of a fishing boat equipped with a wing-trawl and trawling took place during 5 minutes each time. In the laboratory, the crabs were counted, numbered, sexed, weighed, and measured. The carapace width (CW) was measured at the base of the lateral spine and the abdomen width (AW) was measured at the point of the articulation of the fifth abdominal esternite. A total of 596 females of C. danae were analyzed: 417 (69.97%) from Botafogo River and 179 (30.03%) from Carrapicho River; no ovigerous females had CW between 18.38 and 101 mm (59.14 ± 13.65 mm) and 26.70 and 83.48 mm (59.16 ± 13.77 mm), in the respective rivers; the CW of ovigerous females ranged from 57.04 to 83.30 mm (67.68 ± 6.56 mm). The average carapace widths were not significantly different statistically in both estuaries. The knowledge of sexual maturity of C. danae is extremely important for its management and conservation. The gonadal L 50 was estimated in 63.58 mm (χ 2 = 140.47; df = 1; p < 0.01) and 61.59 mm (χ 2 = 90.94; df = 1; p < 0.01) for the estuaries of the Botafogo and Carrapicho rivers, respectively. The morphological L 50 was 57.13 mm (χ 2 = 484.51; df = 1; p < 0.01) for the Botafogo River and 56.46 mm (χ 2 = 257.82; df = 1; p < 0.01) for the Carrapicho River. In both estuaries, the morphological maturity of C. danae females occurred before gonadal maturity; thus, to guarantee that this species be managed successfully, fishing must only be allowed for specimens with carapace width over 65 mm. KEYWORDS.Callinectes danae, blue crab, sexual maturity, estuary, Pernambuco. ; g.l. = 1; p < 0,01) e 61,59 mm (χ 2 = 90,94; g.l. = 1; p < 0,01) e o L 50 morfológico foi de 57,13 mm (χ 2 = 484,51; g.l. = 1; p < 0,01) e 56,46 mm (χ 2 = 257,82; g.l. = 1; p < 0,01), nos estuários dos rios Botafogo e Carrapicho, respectivamente. Em ambos os estuários, a maturidade morfológica de fêmeas de C. danae ocorreu antes da maturidade gonadal e para garantir que esta espécie seja manejada com êxito, sugere-se que a pesca seja permitida apenas em indivíduos com largura da carapaça superior a 65 mm. PALAVRAS-CHAVE.Callinectes danae, siri-azul, maturidade sexual, estuário, Pernambuco.

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“…Therefore, the use of more than one method to determine size at maturity appears to be appropriate, particularly if these methods are to be used to stipulate the minimum legal size of commercially exploited species (HAEFNER 1990, ALUNNO-BRUSCIA & SAINTE-MARIE 1998, OVERTON & MACINTOSH 2002.…”

Section: Sizmentioning

confidence: 99%

Size at sexual maturity of female crabs Sesarma rectum Randall (Crustacea, Brachyura) and ontogenetic variations in the abdomen relative growth

Leme

2005

Rev. Bras. Zool.

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ABSTRACT. The aim of the present study was to ascertain the size at sexual maturity in females of the crab Sesarma rectum Randall, 1840 by comparing gonadal maturity to morphologic maturity (using abdomen-width data). The relative growth of the abdomen was analysed for all growth phases (for each 3-mm carapace width size class), and the slopes of the separate allometric relationships were compared through analysis of covariance (ANCOVA) from log e -transformed data to detect changes in the level of allometry during ontogeny. The physiological size at maturity (gonadal criteria) was determined through a logistic curve, indicating the size at which 50% of females presented mature gonads (M 50 = 17.4 mm CW). The highest allometric levels occurred in growth phases 2 and 3 (body sizes ranging from 15 to 21 mm CW), indicating faster growth of the abdomen during those phases. Phases 1 (< 15 mm CW) and 4 and 5 (size classes above 21 mm CW) showed isometric growth. In the study area, a mangrove on the northern coast of the state of São Paulo, Brazil, individuals of S. rectum began to reach sexual maturity from 15 mm CW onward, when the slopes of the relationship of abdomen width to carapace width became positively allometric, indicating a differential growth rate. A gradual decrease in the slope, tending to isometry, occurred during ontogeny, as the animals became larger (older).

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Estimated Size at Sexual Maturity for Female Mud Crabs (Genus Scylla) From Two Sympatric Species Within Ban Don Bay, Thailand

Cited by 26 publications

References 15 publications

Domestication of the mud crab Scylla serrata

Domestication of the mud crab Scylla serrata

Maturidade sexual das fêmeas de Callinectes danae (Crustacea, Decapoda, Portunidae) nos estuários dos rios Botafogo e Carrapicho, Itamaracá, PE, Brasil

Size at sexual maturity of female crabs Sesarma rectum Randall (Crustacea, Brachyura) and ontogenetic variations in the abdomen relative growth

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