Scientia Marina, Vol 70, No 1 (2006)

Growth of common octopus (Octopus vulgaris) in cages suspended from rafts


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

Albert Chapela
ECOBIOMAR. Instituto de Investigaciones Marinas (CSIC), Vigo, Spain

Ángel F. González
ECOBIOMAR. Instituto de Investigaciones Marinas (CSIC), Vigo, Spain

Earl G. Dawe
Science Branch, Department of Fisheries and Oceans. Canada, United States

Francisco J. Rocha
ECOBIOMAR. Instituto de Investigaciones Marinas (CSIC), Vigo, Spain

Ángel Guerra
ECOBIOMAR. Instituto de Investigaciones Marinas (CSIC), Vigo, 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.

Keywords


Octopus vulgaris; growth; ongrowing; NW Spain

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