Microhabitat use of early benthic stage mud crabs, Scylla serrata (Forskål, 1775), in eastern Australia

Alberts-Hubatsch, Hilke; Lee, Joe; Diele, Karen; Wolff, Matthias; Nordhaus, Inga

doi:10.1163/1937240x-00002256

Cited by 18 publications

(14 citation statements)

References 43 publications

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“…In the present investigation, the amount of trash fish given in different treatments was based on the number of crab stocked and amount of feed provided per individual was kept at the same level. The results in the present experiment are very similar to those of Chakraborty BK, Mirera Do, et al Escritor GL; Samonto GPB, et al; Mwaluma J and Bensam P [1,23,[29][30][31][32][33]. In the present study, a significant higher net benefit was obtained from treatment T1 than those from the treatment T3 and T2.…”

Section: Discussionsupporting

confidence: 90%

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Culture of Soft Shell Mangrove Crab, Scylla Spp. Production in the Southwest Region of Bangladesh

Chakraborty¹

2019

IJOAC

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The experiment was conducted for a rearing for a period of 150 days from mid-September to mid-February 2017 in three earthen ponds with an installing of 9880 cages per hectare with an average depth of 1.0 meter. The experiment was designed at the ponds of Kaligonj Chingri Farm as a treatment T1, Allarchar chingri farm as a treatment T2 and Shamnagar private crab farm as a treatment T3. Before stocking crabs were categorized at five size groups. At stocking, all crabs were with an initial mean carapace width and weight of individual was recorded in three treatments. The average final weight of crab was recorded to be 180.56±4.08, 175.80±7.11 and 178.62±6.42 g in treatment T1, T2 and T3, respectively. The increase in weight of mud crab was the highest in T1 followed by T3 and T2. About five group of different crab weight was stocked in the cages of three treatments. Best SGR (1.67±0.01) and FCR (2.00±0.08) were recorded in treatment T1. The highest survival rate was also observed in T1 and the lowest survival rate was in T2. There was a significant variation (P<0.05) in the survival rate of crabs among three treatments. The net production of crab was at 5082.51, 4689.63 and 4923.48 kg/ha in treatment T1, T2 and T3, respectively. Highest production of soft shell crab was recorded in treatment T1. But no significant (P<0.05) different was recorded in treatment T1 and T3. But a significant (P>0.05) different was found between treatment T2 and treatment T1 and T3. Majority of the crabs about 60-70% molted during night than day time. As the crabs were increased in size, molt duration became longer from 17.0 to 26 days. Overall, highest growth, survival, production and net benefit of soft shell crab recorded at treatment T1. Therefore, treatment T1 and treatment T3 appeared to be most suitable for soft shell crab culture for availability of saline water and trash fish in this area.

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Section: Discussionsupporting

confidence: 90%

“…The mangrove crab is omnivorous and feeds on raw crushed fish, crustaceans, bivalves, molluscs, penaeids and detrital matter. The application of trash fish as feed, the presence of naturally occurring food and muddy nature favored the growth of mud crab [30,31]. Growth of crab depended on the quality of food available.…”

Section: Discussionmentioning

confidence: 99%

Culture of Soft Shell Mangrove Crab, Scylla Spp. Production in the Southwest Region of Bangladesh

Chakraborty¹

2019

IJOAC

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“…In east Africa, this stage was predominantly found on upper intertidal flats landward from the mangrove belt at night moving to subtidal habitats during the day (Mirera, 2014). The very first juvenile stage (3-4 mm CW) was found on upper subtidal mud areas seaward to the mangrove fringe in Australia, which might indicate a settlement in subtidal areas and post-settlement relocation toward the mangrove habitat (Alberts-Hubatsch et al, 2014). In general, these ontogenetic shifts in habitat use, i.e., occupying different microhabitats within the adult habitat, can be seen as a mechanism to avoid interspecific predation and cannibalism by larger conspecifics (AlbertsHubatsch et al, 2014).…”

Section: Juvenile Mud Crabsmentioning

confidence: 96%

“…Juveniles (3-99 mm CW) are resident in the upper intertidal and remain there during low tide (Hill et al, 1982;Alberts-Hubatsch et al, 2014;Mirera, 2014, see Appendix Table 2). Heasman (1980) found crabs hiding under stones (tiles) in the upper intertidal zone in Moreton Bay, south-east Queensland.…”

Section: Juvenile Mud Crabsmentioning

confidence: 99%

“…2 III.) were found in upper intertidal areas between pneumatophores of Avicennia marina near the mangrove fringe at low tide, where they bury in the soft mud (Alberts-Hubatsch et al, 2014). In east Africa, this stage was predominantly found on upper intertidal flats landward from the mangrove belt at night moving to subtidal habitats during the day (Mirera, 2014).…”

Section: Juvenile Mud Crabsmentioning

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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Patterns in abundance, size and space‐use of Giant Mud Crab (Scylla serrata) in a temperate marine protected area

Hewitt,

Johnson,

Erskine

et al. 2024

Aquatic Conservation

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Marine Protected Areas limit fishing to protect a broad range of species and enhance biodiversity. Consequently, closures may not benefit species equally and species‐specific assessments are required to determine the impact of closures. Relative abundance and size of Giant Mud Crab (Scylla serrata) was compared across no‐take and fished zones in Port Stephens‐Great Lakes Marine Park, on the temperate east coast of Australia (32.45°S). In addition, passive acoustic telemetry was used to estimate daily space‐use areas. Similar abundances were observed between no‐take and fished zones; however certain no‐take sites had higher abundances than others. In addition, crabs were 9.9 mm larger in no‐take zones on average. Daily crab space‐use varied widely (~4 to 1000 m2), and generally increased with water temperature and conductivity. These patterns indicate that recruitment processes interact with marine park protection to shape crab abundances across estuaries. However no‐take zoning appears to primarily limit fishing mortality on legal size crabs (i.e., carapace length >85 mm) resulting in larger crabs within no‐take zones. This may mean no‐take zones enhance reproductive output of crab populations since larger individuals are likely to be more fecund.

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Microhabitat use of early benthic stage mud crabs, Scylla serrata (Forskål, 1775), in eastern Australia

Cited by 18 publications

References 43 publications

Culture of Soft Shell Mangrove Crab, Scylla Spp. Production in the Southwest Region of Bangladesh

Culture of Soft Shell Mangrove Crab, Scylla Spp. Production in the Southwest Region of Bangladesh

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

Patterns in abundance, size and space‐use of Giant Mud Crab (Scylla serrata) in a temperate marine protected area

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