Feeding preferences of Scomber japonicus in the Canary Islands area
Castro, J.J.; Santana Del Pino, A. (1994). Feeding preferences of Scomber japonicus in the Canary Islands area. Sci. Mar. (Barc.) 59(3-4): 325-333
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358; e-ISSN 1886-8134, meer
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| Trefwoorden |
Aquatic organisms > Food organisms
Behaviour > Feeding behaviour
Diets
Food preferences
Interspecific relationships > Predation
Stomach content
Temporal variations > Periodic variations > Seasonal variations
Scomber japonicus Houttuyn, 1782 [WoRMS]; Scombridae Rafinesque, 1815 [WoRMS]
Marien/Kust |
| Auteurs | | Top |
- Castro, J.J.
- Santana Del Pino, A.
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| Abstract |
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 photoactic 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 chub mackerel and data from sampling programs of zooplankton in the area. There are some aspects, however, that still remain unsolved. |
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