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The growth and population dynamics of Octopus insularis targeted by a pot longline fishery in north-eastern Brazil

Published online by Cambridge University Press:  28 January 2022

B.B. Batista
Affiliation:
Universidade Federal do Oeste do Pará, Instituto de Ciências e Tecnologia das Águas, Santarém, PA, Brazil
H. Matthews-Cascon
Affiliation:
Departamento de Biologia, Universidade Federal do Ceará, Fortaleza, CE, Brazil
R.A. Marinho
Affiliation:
Departamento de Engenharia de Pesca, Universidade Federal do Ceará, Fortaleza, CE, Brazil
E. Kikuchi
Affiliation:
Universidade Federal do Rio Grande, Programa de Pós-Graduação em Oceanografia Biológica, Instituto de Oceanografia, Rio Grande, RS, Brazil
M. Haimovici*
Affiliation:
Universidade Federal do Rio Grande, Instituto de Oceanografia, Rio Grande, RS, Brazil
*
Author for correspondence: M. Haimovici, E-mail: manuelhaimovici@gmail.com

Abstract

The population dynamics of the stout reef octopus, Octopus insularis fished with longlines of pots in mid-shelf waters of north-eastern Brazil was studied based on fishermen's logbooks and onboard monthly fishing trips from September 2009 to August 2010. Specimens marked with oxytetracycline kept in tanks for up to 21 days provided evidence of the daily deposition of growth increments in the lateral wall of the upper beaks. Sampled specimens weighed 50–1280 g and had 43–172 daily growth increments. Compared with congeneric species from higher latitudes, O. insularis grows faster and has a shorter longevity in the north-eastern Brazil tropical environment. Total catches and catch-per-unit effort were substantially higher in the dry season, with less wind and cooler temperatures. The presence of larger specimens was seasonal, correlated with the chlorophyll-a levels recorded six months earlier. The year-round presence of mature females and males, spawned females, and egg masses attached to the pots, were considered evidence of migration of small and young specimens from coastal areas towards the 20–40 m depth range for reproduction. Annual landings attained ~200 tonnes (2005–2010). Although recent landing statistics are missing, fishermen interviewed in 2021 claimed that the fishery was still profitable. It is suggested that, despite the lack of management, the fast growth, year-round reproduction and limited market for this relatively small octopus, prevented the fishery from collapse and reinforces the current view of the high resilience of cephalopod fisheries.

Type
Research Article
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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