Abstract
There have been controversies on whether the preadult and adult of sardine are mainly herbivores or carnivores. The results of an extensive work on the stomsch contents of the sardine carried out in the seas east of Hokkaido to off Joban in their feeding period during May-December 1982, showed that the ingested food might fairly reflect the composition of environmental plankton and many sardine took more plants than animals, when compared by volume. The variations in abundance of the three pacific sardines have well matched the long-term climatic trend, probably due to the considerable dependence of fishes on algae that are the biological products closest to solar radiation.
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