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Estimating the density of Pennant's swimming crab, Portumnus latipes (Pennant, 1777) in the swash zone using baited stakes and area of attraction

Published online by Cambridge University Press:  28 September 2018

Claudia Cores*
Affiliation:
Faculdade de Ciências e Tecnologia (FCT), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
Miguel B. Gaspar
Affiliation:
Center of Marine Sciences (CCMAR), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal Instituto Português do Mar e da Atmosfera, I.P./IPMA, Avenida 5 de Outubro, s/n, P-8700-305 Olhão, Portugal
Karim Erzini
Affiliation:
Center of Marine Sciences (CCMAR), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
*
Author for correspondence: Claudia Cores, E-mail: claucores@gmail.com

Abstract

We used a new, easy to use, highly selective, low impact and cheap method of sampling in the swash zone of a sandy beach to obtain catch per unit effort data (CPUE) for Pennant's swimming crab, Portumnus latipes (Pennant, 1777). Metal stakes baited with sardines were used to attract the crabs that were caught by hand. Crab density was estimated based on area of attraction and maximum CPUE and compared with estimates from bivalve dredges used at depths from 3 to 6.5 m. The baited stake method gave an estimate of 0.026 crabs m−2, which is comparable to bivalve dredge estimates (0.0059–0.045 crabs m−2). This approach can be used for crustaceans, gastropods and other mobile benthic organisms.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2018 

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