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

Barnes, David K. A.; Dulvy, Nicholas K.; Priestley, S. H.; Darwall, William; Choisel, V.; Whittington, Michael Shelton

doi:10.2989/025776102784528312

Cited by 25 publications

(25 citation statements)

References 11 publications

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“…This report coincides with earlier studies, which reported densities of 44-53 crabs per hectare for Natal, South Africa (Robertson & Piper, 1991) and 80 crabs per hectare for another South African estuary (Kleinemond estuary, Hill, 1975). Maximum densities were found in Tanzania with 1228 ± 7.3 crabs per hectare (±SD) at the mangrove fringe and 324 ± 10 crabs per hectare in the inner mangroves, resulting in biomass estimates of 604 and 188 kg per hectare, respectively (Barnes et al, 2002). The high discrepancies in abundances might be due to both different sampling techniques (catching technique and effort, sampling intertidal or subtidal areas or both, sampling time) and/or actual differences in densities induced by habitat or environmental conditions.…”

Section: Sex Ratios and Densitymentioning

confidence: 99%

“…Taken these experimental numbers to the field, mud crabs increase their weight from 360 to 680 g within a year while consuming 1.74 kg of prey. Combining this number with the lowest estimate for biomass of 188 kg/hectare inside the mangrove forest (Barnes et al, 2002) would result in 654.2 kg biomass consumed by mud crabs per hectare and year. At the mangrove fringe, the amount of biomass consumed by mud crabs per hectare per year would be even greater, at 2101.9 kg (604 kg of crab biomass per hectare; Barnes et al, 2002).…”

Section: Feeding and Trophic Rolementioning

confidence: 99%

“…Combining this number with the lowest estimate for biomass of 188 kg/hectare inside the mangrove forest (Barnes et al, 2002) would result in 654.2 kg biomass consumed by mud crabs per hectare and year. At the mangrove fringe, the amount of biomass consumed by mud crabs per hectare per year would be even greater, at 2101.9 kg (604 kg of crab biomass per hectare; Barnes et al, 2002). These figures are likely to vary strongly between regions and can only provide guidance on the potential importance of mud crabs in estuarine ecosystems.…”

Section: Feeding and Trophic Rolementioning

confidence: 99%

“…It can be found in tropical and subtropical coastal regions of the IWP including the southern coast of South Africa (34°S) (Du Plessis, 1971), the east coast of Africa (Le Reste et al, 1976;Barnes et al, 2002;Davis et al, 2004;Fondo et al, 2010;Macia et al, 2014), the Red Sea (Keenan et al, 1998), Gulf of Aden (Simões et al, 2001), the Arabian/ Persian Gulf (Hogarth & Beech, 2001;RezaieAtagholipour et al, 2013), South-east and East Asia (Bight of Bengal, 19-21°N, Mohanty et al, 2006;Zafar et al, 2006;Indonesia, 5°N-10°S, Sugama and Hutapea, 1999;Nordhaus et al, 2009), the northern Philippine Sea, (34°N) (Imai et al, 2004), and Australia (Keenan et al, 1998). It also occurs around oceanic islands of the Indo-Pacific: Marianas, Fiji, Samoa Islands (Keenan et al, 1998), and Seychelles, Maldives, and Mauritius (Gopurenko et al, 1999;Anand et al, 2006;Fratini et al, 2010).…”

Section: Geographic Distributionmentioning

confidence: 99%

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Life-history, movement, and habitat use of Scylla serrata (Decapoda, Portunidae): current knowledge and future challenges

et al. 2015

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The mud crab Scylla serrata is a highly exploited species, associated to mangrove ecosystems in the Indo-West-Pacific. It has a complex life cycle with a dispersing larvae phase, and benthic juveniles and adults. The former are stenohaline depending on high-salinity conditions to survive, whereas the latter are physiologically well adapted to changing temperatures and salinities, conditions that typically occur in mangrove habitats. Movement and habitat use of large juveniles and adults are well studied, and these life stages are known to utilize and move between various habitats within the mangrove ecosystem: intertidal flats as well as subtidal channels and flats. Females undertake long movements from brackish inshore waters to waters with oceanic conditions for spawning. Sensory abilities-of early stages and adult stageshave hardly been studied, and little is known about larval and early benthic stages in the wild. Summarizing, the literature revealed substantial gaps in the understanding of the spatiotemporal dynamics of the different life stages and of the clues that trigger recruitment, movement, and other behavior. This is the first comprehensive review on the life history, movement patterns, habitat use, and systemic role of S. serrata with emphasis on the respective life stages and geographic differences. We emphasize the need for further research into these processes as a basis for the sustainable management and conservation of this species.

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Section: Sex Ratios and Densitymentioning

confidence: 99%

Section: Feeding and Trophic Rolementioning

confidence: 99%

Section: Feeding and Trophic Rolementioning

confidence: 99%

Section: Geographic Distributionmentioning

confidence: 99%

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Life-history, movement, and habitat use of Scylla serrata (Decapoda, Portunidae): current knowledge and future challenges

et al. 2015

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“…Several studies have been conducted on the use of tag-recapture approaches to quantifying growth in mud crabs (Hill, 1975;Hill et al, 1982;Barnes et al, 2002). Slow-growing or larger species are preferable for these tag-recapture experiments (Chang et al, 2012.…”

Section: Tag and Recapture Datamentioning

confidence: 99%

Growth Models and Analysis of Crustacean Growth Data

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

Cited by 25 publications

References 11 publications

Life-history, movement, and habitat use of Scylla serrata (Decapoda, Portunidae): current knowledge and future challenges

Life-history, movement, and habitat use of Scylla serrata (Decapoda, Portunidae): current knowledge and future challenges

Growth Models and Analysis of Crustacean Growth Data

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

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