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image of Journal of Crustacean Biology

ABSTRACT Collections with opening-closing midwater trawls to a depth of 2,400 m and with bottom trawls were used to describe the vertical distributions of pelagic crustaceans from the surface to the sea floor at 3,000 m off Oregon. Twenty-nine species of decapod shrimps, representing 14 genera, were captured. The number of species and individuals decreased with increased depth. Sergestes similis predominated in catches in the upper mesopelagic and epipelagic waters and comprised 74 percent of the individuals in the entire water column. Only four species exhibited definite diel vertical migrations (S. similis, Bentheogennema burkenroadi, Gennadas propinquus and Pasiphaea chacei). Most species, especially carids, were nonmigratory. Some depth stratification by size and sex was noted. The size of eggs brooded by female carids showed no consistent trend to increase with increasing depth for closely related species. Within the carids and penaeids, meso- to bathypelagic species have decreased egg number compared to epipelagic species; nevertheless within the carids, the number of eggs brooded per female was always highest for the deepest living species within a genus, which were also the largest sized species. Reproductive effort showed some trends with depth, but may also be influenced by other variables, such as available food resources.

Affiliations: 1: School of Oceanography, Oregon State University, Corvallis, Oregon 97331


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