Abstract
Equal total volumes (10 mm 3) of eight species of 14C labelled algae were fed to the bay scallop Argopecten irradians concentricus (Say) to measure food utilization. Each alga was fed at a suspension density of 2 mm 3 l to five scallops in individual containers. Suspension density was maintained by an automatic turbidimetric feeding device. Assimilation efficiencies for Chlorella autotrophica var. atypica Shihara et Krauss (17.4%), Pavlova lutheri (Droop) Green (78.1 %), and Thalassiosira pseudonana (Hustedt) Hasle et Heimdal (89.9%) were statistically different from other algal food sources tested (mean 83.6%). Qualitative utilization of algae was investigated by measuring 14C distribution in scallop tissues and respired 14CO 2, Correlations were found between the distribution of assimilated label and levels of 14C in various biochemical fractions of algae. Correlations provided some insight on possible utilization of particular nutrients; some of the dietary lipids appeared to be stored in the digestive gland, and polysaccharides appeared to be used as a respiratory substrate.
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