Abstract
Comparisons of abundance, population size structure, and sex ratio were made for blue cod Parapercis colias (Pinguipedidae) sampled by pots and SCUBA diver counts in the Marlborough Sounds, New Zealand. Pilot studies determined appropriate transect dimensions, and found no difference between morning and afternoon pot sets, or between slack and running tides. The relationship between pot catch and density of blue cod in diver counts was positive, but weak. Pots consistently caught larger fish than those recorded by divers. The sex ratios estimated by pots and divers spearing blue cod nearby were similar. Pots undersample small individuals relative to diver counts. The practical advantages of pots may outweigh those limitations as a technique for assessing the fishery.
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