Feeding preferences of Scomber japonicus in the Canary Islands area
Analysis of the stomach contents of 721 specimens of Scomber japonicus shows a feeding preference 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 i...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 1995 |
| País: | España |
| Repositorio: | accedaCRIS portal de investigación de la Universidad de las Palmas de Gran Canaria |
| OAI Identifier: | oai:accedacris.ulpgc.es:10553/1270 |
| Acceso en línea: | http://hdl.handle.net/10553/1270 |
| Access Level: | acceso abierto |
| Palabra clave: | 3105 Peces y fauna silvestre Caballa Peces Canarias Alimentación Vertical-Distribution Hyperbenthic Mysids Selection Crustacea Behavior Mackerel Ecology Scomber Japonicus Feeding Trophic Preferences Canary Islands |
| Sumario: | Analysis of the stomach contents of 721 specimens of Scomber japonicus shows a feeding preference 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 purse seiners use light to lure mackerel at night. This would explain the differences in the abundance of mysids between the stomach contents of club mackerel and data from sampling programs of zooplankton in the area. There are some aspects, however, that still remain unsolved. |
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