TEMPORAL CHANGES IN PELAGIC BIOMASS OF PLEURONCODES PLANIPES STIMPSON (DECAPODA ANOMURA, GALATHEIDAE) OFF BAJA CALIFORNIA, MEXICO BY MAURICE BLACKBURN Institute of Marine Resources, University of California, La Jolla, California, U.S.A. Adults of the galatheid Pleuroncodes planipeJ Stimpson are very abundant off the west coast of Baja California, Mexico (Boyd, unpublished; Longhurst, 1967; Blackburn, 1969). They occur in the water column and on the bottom; the largest are exclusively benthic (Boyd, 1967). Vernacular names include "red crab" and "langostilla". Blackburn & Thorne (1974) reported preliminary studies of pelagic nekton of a small area off Baja California from April 11 to April 30, 1973. Pleuroncodes planipe.r comprised 90% or more by weight of each of their samples, which were obtained with a micronekton net. The remainders were fish, mostly anchovy (Engrauli.r mordax Girard). A cooperating Soviet research vessel obtained very similar results with a commercial-sized pelagic trawl. It was concluded that the pelagic nekton was almost entirely Pleuroncode.r. Its biomass in several net hauls was compared with simultaneous acoustic measurements of nekton in the water column. A significant linear regression was found, and was then used to estimate biomass from acoustic data alone. Temporal changes in the biomass were discussed
Crustaceana – Brill
Published: Jan 1, 1977
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