Growth of common octopus (<em>Octopus vulgaris</em>) in   cages suspended from rafts

Albert Chapela; Ángel F. González; Earl G. Dawe; Francisco J. Rocha; Ángel Guerra

doi:10.3989/scimar.2006.70n1121

Authors

Albert Chapela ECOBIOMAR. Instituto de Investigaciones Marinas (CSIC), Vigo
Ángel F. González ECOBIOMAR. Instituto de Investigaciones Marinas (CSIC), Vigo
Earl G. Dawe Science Branch, Department of Fisheries and Oceans. Canada
Francisco J. Rocha ECOBIOMAR. Instituto de Investigaciones Marinas (CSIC), Vigo
Ángel Guerra ECOBIOMAR. Instituto de Investigaciones Marinas (CSIC), Vigo

DOI:

https://doi.org/10.3989/scimar.2006.70n1121

Keywords:

Octopus vulgaris, growth, ongrowing, NW Spain

Abstract

Two ongrowing experiments were conducted using a raft deployed for rearing mussels during summer and winter in the Ria of Vigo, Galicia, NW Spain. Two 3 m x 1.5 m x 6 m galvanized iron ongrowing cages were suspended from this platform, each equipped with dens constructed from PVC pipe. Small common octopus (Octopus vulgaris) were captured by the small-scale creel fishery in the ria and placed in one of two sex-specific experimental cages. Specimens were fed a standard diet (fish, decapod crustacean and mussels) at a daily feeding rate of 5% of the total weight of the animals in each cage. Due to the very high mortality as a result of decreased salinity in the winter experiment and spawning during the summer experiment, only data from the first 75 days of each experiment were compared. Growth rates were significantly higher in summer than in winter for both sexes, which was probably due to higher ambient culture temperatures during summer. Mortality was also higher during summer than winter. It was concluded that culture of common octopus on mussel rafts may be viable, especially if problems related to salinity, the acquisition of specimens from the wild and losses due to spawning can be reduced.

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