Abstract

1. 1. The plasma biliverdm concentrations of American eels, Anguilla rostrata, acclimated to fresh and brackish water were determined. 2. 2. The brackish water-acclimated group exhibited significantly higher biliverdin concentrations than did their freshwater counterparts. 3. 3. Hemoglobin concentrations, hematocrits and erythrocyte counts were greater for the freshwater-acclimated group. 4. 4. These data suggest that plasma biliverdin concentrations in eels may result from hemoglobin turnover which is environmentally dependent. Possible reasons for the retention of this biliprotein in the brackish water animals are discussed.

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