ISOLATION OF OLIVE ROCKFISH, SEBASTESSERRANOIDES, POPULATIONSOFF SOUTHERNCALIFORNIA

Movements of the olive rockfish, Sebastes serronoides, off Santa Barbara, California, were investi­ gated, using mechanical and parasite tags. The movements were restricted over shallow reefs though somewhat less so around deeper oil platforms. Highly restricted movements may cause greater vulnerability ofpopulations to overfishing-oomparisons ofolive rockfish size frequencies between two reefs indicated that fishing pressure had reduced olive rockfish populations to almost all prereproduc­ tive individuals on the more heavily fished site. Rockfishes, genus Sebastes (Family Scor­ paenidae), form a most diverse fish group along the California coast. Some 57 species are found in these waters (Miller and Lea 1972), inhabiting virtually every marine habitat from estuarine (oc­ casionally) and intertidal waters to depths ofmore than 610 m (Miller and Lea). Rockfish are very important to both sport and commercial fishing industries; in California waters in 1974, rockfish ranked third in the commercial fishery (poundage landed) and first in the sport fishery (numbers landed) (McAllister 1976).

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