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Catch rate and emergence of male and female spanner crabs (Ranina ranina) in Australia

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Abstract

Catches of the spanner crab, Ranina ranina (Linnaeus, 1788), in southern Queensland, Australia in 1982 and 1983 showed a seasonal cycle, with peak catches from August to September. In most catches, males outnumbered females. Catches of both male and female spanner crabs declined in November and December, when a high proportion of females caught were ovigerous. Fish, echinoderms and polychaetes were the main food items. Closed-circuit time-lapse video recording was used to study the emergence behaviour of R. ranina in a 6 m-diameter tank. Spanner crabs in this tank were buried most of the time, emerging on average for only 1.7 h d-1. They emerged mainly between 16.00 and 24.00 hrs and, less often, between 01.00 and 15.00 hrs. Males remained emerged significantly longer than females. The duration of emergence of the females peaked before the spawning season, becoming shorter during the period when they were ovigerous. Temperature and emergence were negatively correlated. It is concluded that reproductive behaviour has a strong influence on catch composition of spanner crabs.

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Communicated by J. Mauchline, Oban

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Skinner, D.G., Hill, B.J. Catch rate and emergence of male and female spanner crabs (Ranina ranina) in Australia. Marine Biology 91, 461–465 (1986). https://doi.org/10.1007/BF00392596

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  • DOI: https://doi.org/10.1007/BF00392596

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