Selective Feeding by Atlantic Herring (Clupea harengus) Larvae on Zooplankton in Natural Assemblages

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Abstract
The hypothesis that larval herring C. harengus select food by type as well as size was tested in laboratory experiments. Herring larvae were reared at 7-9.degree. C on wild zooplankton. The percentage of herring larvae with food at day''s end increased from 4% (4 days)-68% (9 days) and averaged 83% for larvae 25-74 days old. Larval herring selected particles according to type as well as size; this selectivity varied with larval age and hence size. Copepod nauplii and copepodites were preferred by larvae of all sizes. Among copepodites, Pseudocalanus sp. and Oithona sp. were preferred by smaller and larger larvae, respectively, while Acartia sp. was rarely ingested, even when of acceptable size. Mollusk veligers comprised a significant portion of the diet of young (4-24 days) larvae but were actively rejected by older larvae even when perceived and of acceptable size. Particles smaller than the largest acceptable size were consistently preferred, atypical of predation by vertebrates. Larval herring select prey according to type as well as size and that this behavior is acquired through experience.