Nocturnal feeding patterns of Mysis relicta in Lake Michigan, based on gut content fluorescence1

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Abstract
Fluorometric measurements of the gut contents of Mysis relicta were used to determine the relative amount of pheopigment per animal at 0.5, 3.5, and 6.5 h after sunset. Mysid guts always contained significantly greater relative amounts of pheopigments at 3.5 than at 0.5 h after sunset; changes between 3.5 and 6.5 h after sunset were less consistent. This is taken to indicate that mysids filter feed on phytoplankton throughout their summer diel vertical migrations in Lake Michigan.

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