Abstract

ABSTRACT Bioenergetic measurements of egg production, somatic energy storage, excretion, assimilation, and respiration of the crab Chionoecetes bairdi were made. Crabs growing from 10-mm carapace width to maturity were used, so that an energy budget could be calculated. Juvenile crabs allocated about 60% of assimilated energy to respiration, 30% to somatic energy storage, 10% to exuviae, and less than 1% to ammonia production. For mature males, energy allocation was similar to that of juveniles in that respiration required the most energy, but less energy was allocated to growth. Maturing primiparous females stored less energy somatically than similarsized males. Primiparous females allocated 11% of their energy to their first egg clutch. The egg clutches of nonmolting multiparous females contained about twice as much energy as the egg clutches of primiparous females. The bioenergetic measurements were used to provide a preliminary minimum estimate of prey consumption for Tanner crabs.

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