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Feeding preferences of Scomber japonicus in the Canary Islands area
J.J. Castro and A. Santana del Pino

Analysis of the stomach contents of 721 specimens of Scomber japonicus shows a feeding reference for three different items; copepods, mysids and fish. This feeding preference is influenced by habitat, seasonal fluctuations of the available food and the behavioural pattern of the prey species. The importance of mysids in the diet of immature and adult fish, in comparison with theirs importance to juveniles, show differences caused by habitat. On the other hand, fish are eaten, almost exclusively, during the first two quarters of the year. Scomber japonicus shows a predation on this item conditioned by the period of maximal abundance of fry in the area. Fish may feed on swarms of mysids taking advantage of their positive phototactic response to weak light sources, just as purseseiners use light to lure mackerel at night. This would explain the differences in the abundance of mysids between the stomach contents of chub mackerel anddata from sampling programs of zooplankton in the area. There are some aspects, however, that still remain unsolved.

Keywords: Scomber japonicus, feeding, trophic preferences, Canary Islands.
Contents of this volume Sci. Mar. 59(3-4) : 325-333 Back PDF
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