A removal experiment with Octopus dofleini (Wulker)

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Abstract
All O. dofleini martini were removed from a study area in Clayoquot Sound, British Columbia, [Canada], during a 6 wk period and they and their dens were measured. There was an exponential relation between octopus size and the size of den it occupied. In addition, small octopus were found in newly dug dens, while large ones occupied natural dens. Some dens were recolonized by animals of similar size but many remained empty and new dens were often dug in areas where dens already existed. Immigration of octopuses into the control area at the same time suggests that the observed recruitment was not brought about by the harvest. Females were more numerous than males, especially in the smallest sizes. The feasibility of a size-selective trap fishery is indicated.

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