Factors influencing the dynamics of a collapsed blue swimmer crab (Portunus armatus) population and its lack of recovery

Marks, Rachel; Hesp, S. Alex; Denham, Ainslie; Loneragan, N.R.; Johnston, Danielle; Hall, Norman G.

doi:10.1016/j.fishres.2021.106035

Fisheries Research

2021

DOI: 10.1016/j.fishres.2021.106035

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Factors influencing the dynamics of a collapsed blue swimmer crab (Portunus armatus) population and its lack of recovery

Rachel Marks

S. Alex Hesp

Ainslie Denham

et al.

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Cited by 7 publications

References 85 publications

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Abundance and Distribution of Blue Swimmer Crab in Response to Environmental Variation Across Two Contrasting Estuaries

Hanamseth,

Schilling,

Johnson

et al. 2024

Estuaries and Coasts

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Portunid crabs are an iconic, high value species in NSW, but catches are highly variable in space and time. Substantial variation in biomass is observed in both exploited and unfished populations, and environmental effects on distribution and abundance are an important factor contributing to this variability. Predicting and responding to this variability is a challenge for management and sustainability of exploited populations. We examine spatial and temporal variation in Blue Swimmer Crab (Portunus armatus) populations, over a 2.5 year trapping survey in two temperate estuaries that differ in tidal flow and riverine input. Specifically, monthly catch rates and distribution throughout the estuary are examined alongside variation in temperature and conductivity. In Wallis Lake, the shallower estuary with a restricted entrance, both water temperature and conductivity impacted abundance and distribution of crabs but there was no evidence that pulses of freshwater flow had a major impact. For a 10 °C increase in temperature the population on average shifted ~ 700 m closer to the ocean. Males were consistently located slightly further into the estuary compared to females, but there was no convincing evidence of estuarine egression in response to lower salinity. In Port Stephens, the deeper, tidal estuary, water temperature and conductivity also impacted abundance, but while males were more dispersed than females, the distribution of crabs within the estuary did not appear to be influenced by temperature, conductivity or flow. These results highlight the links between nuanced environmental relationships and estuarine geomorphology for Blue Swimmer Crab.

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Abundance and Distribution of Blue Swimmer Crab in Response to Environmental Variation Across Two Contrasting Estuaries

Hanamseth,

Schilling,

Johnson

et al. 2024

Estuaries and Coasts

View full text Add to dashboard Cite

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Data intermediate assessment: Examining the suitability of a novel depletion model for use in a spiny lobster fishery

de Lestang,

How

2023

Fisheries Research

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Density-dependence inside a marine protected area increases natural mortality and stunts the growth of a spiny lobster

Tuffley,

de Lestang

2024

Fisheries Research

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Factors influencing the dynamics of a collapsed blue swimmer crab (Portunus armatus) population and its lack of recovery

Cited by 7 publications

References 85 publications

Abundance and Distribution of Blue Swimmer Crab in Response to Environmental Variation Across Two Contrasting Estuaries

Abundance and Distribution of Blue Swimmer Crab in Response to Environmental Variation Across Two Contrasting Estuaries

Data intermediate assessment: Examining the suitability of a novel depletion model for use in a spiny lobster fishery

Density-dependence inside a marine protected area increases natural mortality and stunts the growth of a spiny lobster

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