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Knowledge of naupliar morphology is very important for studies of stage-dependent bi- ological and ecological phenomena. Larval walleye pollock (Theragra chalcogramma Pallas) in the southeastern Bering Sea are very selective in the species of copepods and developmental stages that they eat. They pre- fer nauplii of Metridia, although these nau- plii are relatively rare (Hillgruber et al., 1995). As part of a study of biological and physical variability that influences recruit- ment of walleye pollock in the southeastern Bering Sea, I describe the naupliar stages of Metridia pacific Brodsky, 1950, and those diagnostic features that facilitate their iden- tification. MATERIALS AND METHODS Adult copepods were sorted from samples collected in the Aleutian Basin of the southeastern Bering Sea and shipped to the Seward Marine Center Laboratory. Females were maintained in separate containers with fresh sea wa- ter in a temperature controlled room at 3°C. The cope- pods were fed ad libitum a mixture of autotrophic fla- gellates (Isochrysis galbana Parke and Tetraselmis sue- cica (Kylin) Butcher) and the diatom Chaetoceros calcitrans (Paulsen) Takano. Artemia sp. reared for 2 weeks with the above flagellates were added to the mix- ture. During the fall of 1995 and the winter of
Journal of Crustacean Biology – Brill
Published: Jan 1, 1997
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