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The common octopus fishery in South Portugal: a new shelter-pot
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Orientador(es)
Resumo(s)
The octopus is one of the most important marine resources in
Portugal, especially in the South, the Algarve region. The fishing
gears mostly used are the “alcatruz” and the “covo”. The
“alcatruz” is a shelter-pot traditionally made of clay, with an
amphora shape, but recently plastic cylindrical pots were introduced
and became more popular. “Covos” are baited metal
cage-traps covered by a plastic net.
Although very popular among fishermen, the traditional “alcatruz”
made of clay has been replaced by cylindrical plastic
pots with great success, due to its resistance to brake. In an
attempt to continue using the traditional amphora-shape, a
new type of plastic pot was built in association with fishermen.
To study the behaviour of the common octopus (Octopus vulgaris)
towards the traditional amphora clay shelter-pot, the
cylindrical plastic shelter-pot and the new amphora plastic
shelter-pot, several experiments were performed in controlled
tanks. Three main questions were attempted to answer concerning
the preferences of the common octopus towards the
pots: 1) What kind of material: plastic or clay (traditional); 2)
What shape: cylindrical or amphora (traditional); 3) What colour:
white, black or red brick (traditional). The results showed
no particular preference towards the material of the fishing gear; a strong preference for the traditional amphora shape;
and a strong preference for the black colour.
Descrição
Palavras-chave
Octopus fishery Octopus shelter-pots Octopus fishing gear Octopus behaviour
Contexto Educativo
Citação
Borges, Teresa C.; Calixto, Patricia; Sendão, João. The common octopus fishery in South Portugal: a new shelter-pot, Mediterránea. Serie de Estudios Biológicos, ESP, Especial, 130-154, 2015.