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:10.1163/20021975-99990293

Cited by 52 publications

(26 citation statements)

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“…Thus, the absence of spawning and post-spawned females in the near-shore mangrove regions, and the small frequencies of females with tertiary vitellogenic ovaries suggested the occurrence of a spawning migration to offshore regions. This phenomenon has been reported previously in Thailand [5,14]. However, it is necessary to collect females just prior to and/or after the spawning from offshore regions to validate the relationship between gonadal maturation and spawning migration.…”

Section: Discussionsupporting

confidence: 78%

“…Intermediate U-shape Abdominal shape Overton and Macintosh [5] used the pubertal molt as a morphological indicator of ovarian maturity with the shape of abdomen. In the present study, the comparison of abdominal shape and ovarian maturation stage on the basis of histological observation showed that the intermediate crabs were not gone to the vitellogenic stage (III) ovary which indicates all intermediate crabs are immature female.…”

Section: V-shapementioning

confidence: 99%

“…Four species of the genus Scylla are revised [3]; Scylla serrata, S. paramamosain, S. olivacea 1 Corresponding author: tuhinkk@yahoo.com and S. tranquebarica, of which S. olivacea, S. paramamosain and S. serrata have been recorded in Thailand. Though S. olivacea reported as the most common species [4], S. paramamosain also exists as co-existence and in equal proportion in some areas in Thailand [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Ovarian Development of the Mud Crab Scylla paramamosain in a Tropical Mangrove Swamps, Thailand

2010

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The present study describes the ovarian development stages of the mud crab, Scylla paramamosain from Pak Phanang mangrove swamps, Thailand. Samples were taken from local fishermen between June 2006 and December 2007. Ovarian development was determined based on both morphological appearance and histological observation. Ovarian development was classified into five stages: proliferation (stage I), previtellogenesis (II), primary vitellogenesis (III), secondary vitellogenesis (IV) and tertiary vitellogenesis (V). The formation of vacuolated globules is the initiation of primary vitellogenesis and primary growth. The follicle cells were found around the periphery of the lobes, among the groups of oogonia and oocytes. The follicle cells were hardly visible at the secondary and tertiary vitellogenesis stages. Yolk granules occurred in the primary vitellogenesis stage and are first initiated in the inner part of the oocytes, then gradually concentrated to the periphery of the cytoplasm. The study revealed that the initiation of vitellogenesis could be identified by external observation of the ovary but could not indicate precisely.

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Section: Discussionsupporting

confidence: 78%

Section: V-shapementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ovarian Development of the Mud Crab Scylla paramamosain in a Tropical Mangrove Swamps, Thailand

2010

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“…Carapace width (mm CW) and body weight (g BW) of each crab were recorded. Sex and ovarian maturation of female crabs were noted and categorized as immature, mature, gravid, berried and spent using the ovaries and abdomen morphology as an indicator of maturity (Overton and Macintosh, ). Each crab was then injected at the base of its third walking leg on the right with a magnetic decimal sequential microwire tag (1.1 mm long, 0.25 mm diameter), commonly called a coded wire tag (CWT), using a hand‐held multi‐shot microwire tag injector from Northwest Marine Technology, Inc., following Ut et al .…”

Section: Methodsmentioning

confidence: 99%

Identifying mangrove areas for fisheries enhancement; population assessment in a patchy habitat

Lebata

Walton

Biñas

et al. 2012

Aquatic Conservation

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1. Small-scale fisheries are an important element of the ecosystem goods and services that mangrove habitats provide, especially to poorer coastal communities that rely most on natural resources, and have similar values to payments for ecosystem services (PES) under carbon-trading schemes.2. In advance of fishery-enhancement trials for the mud crab Scylla olivacea, a mark-recapture study was conducted to estimate population size and turnover in 50 ha of isolated mangrove on Panay Island, Philippines. A total of 811 crabs were released in six sessions with an overall recapture rate of 41.5 AE 3.6%. Population size ranged from 607-1637 individuals.3. There was a high degree of site-fidelity, with 45.5% of recaptures in the same sampling areas as releases. Total mortality was 0.79 month -1 , with fishing mortality accounting for 95% of overall mortality. 4. Von Bertalanffy and Gompertz growth models yielded estimates for L 1 (carapace width) of 117.3 AE 14.7 and 110.6 AE 2.1 mm and for k of 2.16 AE 0.74 and 3.25 AE 0.81, respectively. Crab densities of 12-33 individuals ha -1 in the study area were lower than in other mangrove systems owing to intermittent recruitment, while growth rates indicated no limitation in terms of food supply.5. The study demonstrates that in specific mangrove habitats that are below carrying capacity, there is potential for fisheries enhancement to sustain or increase direct economic benefits from mangrove ecosystems and hence promote community engagement in broader conservation and PES initiatives.

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“…Previous studies have shown that the minimum legal CW of captured crabs could be roughly based on CW 50 (Islam et al 2010, Overton andMacintosh 2002). Johnson et al (2010) suggested that, in order to protect spawning females, the minimum legal CW of females should be more than CW 50 .…”

Section: Size At Maturity and Size Distributionmentioning

confidence: 99%

Size distribution and monthly variation of ovarian development for the female blue swimmer crab, Portunus pelagicus in Beibu Gulf, off south China

Liu¹,

Wu²,

Wang³

et al. 2014

Sci. Mar.

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Summary:The present study was conducted to investigate the size distribution and seasonality variation of ovarian development for females of the blue swimmer crab, Portunus pelagicus, from Beibu Gulf, China. The results show that, based on pubertal moult, gonadosomatic index (GSI), morphology and histological configurations, the ovarian development cycle of P. pelagicus can be divided into five stages; Stage I, dominated by oogonia with some previtellogenic oocytes and endogenous vitellogeic oocytes; Stage II, dominated by endogenous vitellogenic oocytes with some previtellogeic oocytes and oogonia; Stage III, dominated by exogenous vitellogeic oocytes; Stage IV, of nearly mature oocytes; and Stage V, of mature oocytes with fully ripened ovary. GSI increased significantly during the ovarian development (P<0.05), while the hepatosomatic index (HSI) appeared to decrease. Thus, a significant negative correlation was found between GSI and HSI (P<0.01). The smallest carapace width of a mature female and that at which 50% of females reach maturity were 79.2 mm and 108.2 mm, respectively. The carapace width and body weight of the dominant size class ranged between 86 and 115 mm and 40 and 120 g, respectively. Furthermore, the highest GSI of female P. pelagicus was found in March, while the peak of ovigerous females was found in April.Keywords: blue swimmer crab; ovarian development; size at maturity; seasonality.Distribución del tamaño y variación mensual del desarrollo ovárico del cangrejo azul hembra, Portunus pelagicus en el golfo de Beibu, frente al sur de China Resumen: Este estudio se realizó para investigar la distribución del tamaño y la estacionalidad de desarrollo ovárico del cangrejo azul hembra, Portunus pelagicus en el golfo de Beibu, China. Los resultados muestran que, sobre la base de la muda de la pubertad, el GSI (índice gonadosomático), la morfología y las configuraciones histológicos y el ciclo del desarrollo ovárico de P. pelagicus puede dividirse en cinco etapas. Etapa I: La fase de oogonia (OG) dominaba con algunos ovocitos previtelogeicos (PR) y ovocitos vitelogeicos endógenos (EN); Etapa II: fase de EN dominaba con algunos PR y OG; Etapa III: la fase de ovocitos vitelogeicos exógenos (EX) era dominante; Etapa IV: fase de ovocitos casi maduros (NO); Etapa V: fase de ovocitos maduros (MO) y maduración completa del ovario. El índice gonadosomático (GSI) aumentó significativamente durante el desarrollo del ovario (P<0.05), mientras que el índice hepatosomático (HSI) parecía disminuir. Por lo tanto, se encontró una correlación negativa significativa entre GSI y HSI (P<0.01). La menor anchura del caparazón (CW) de una hembra madura y CW del 50% de las hembras maduras eran 79.2 mm y 108.2 mm, respectivamente. La CW y el peso corporal de la clase de tamaño dominante oscilaban entre 86-115 mm y 40-120 g respectivamente. Por otra parte, el GSI de la hembra más grande de P. pelagicus se encontró en marzo, mientras que el pico de las hembras ovígeras se produjo en abril en la población del golfo de Beibu .P...

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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 52 publications

References 0 publications

Ovarian Development of the Mud Crab <i>Scylla paramamosain</i> in a Tropical Mangrove Swamps, Thailand

Ovarian Development of the Mud Crab <i>Scylla paramamosain</i> in a Tropical Mangrove Swamps, Thailand

Identifying mangrove areas for fisheries enhancement; population assessment in a patchy habitat

Size distribution and monthly variation of ovarian development for the female blue swimmer crab, <em>Portunus pelagicus</em> in Beibu Gulf, off south China

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