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Size structure and feeding dynamics in estuarine clupeoid fish schools: field evidence for the school trap hypothesis
Maes, J.; Ollevier, F.P. (2002). Size structure and feeding dynamics in estuarine clupeoid fish schools: field evidence for the school trap hypothesis, in: (2002). VLIZ Coll. Rep. 32(2002). VLIZ Collected Reprints: Marine and Coastal Research in Flanders, 32: pp. chapter 31
In: (2002). VLIZ Coll. Rep. 32(2002). VLIZ Collected Reprints: Marine and Coastal Research in Flanders, 32. Flanders Marine Institute (VLIZ): Oostende, more
In: VLIZ Collected Reprints: Marine and Coastal Research in Flanders. Vlaams Instituut voor de Zee: Oostende. ISSN 1376-3822, more

Also published as
  • Maes, J.; Ollevier, F.P. (2002). Size structure and feeding dynamics in estuarine clupeoid fish schools: field evidence for the school trap hypothesis. Aquat. Living Resour. 15(4): 211-216. dx.doi.org/10.1016/S0990-7440(02)01181-6, more

Available in Authors 
    VLIZ: Open Repository 98722 [ OMA ]

Keywords
    Feeding behaviour; Schooling behaviour; Clupea harengus Linnaeus, 1758 [WoRMS]; Clupea harengus Linnaeus, 1758 [WoRMS]; Sprattus sprattus (Linnaeus, 1758) [WoRMS]; Sprattus sprattus (Linnaeus, 1758) [WoRMS]; ANE, Belgium [Marine Regions]; Marine; Brackish water
Author keywords
    schooling behaviour; school trap hypothesis; diet composition; niche overlap; size-assortativeness; Clupea harengus; Sprattus sprattus

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Abstract
    An analysis of 273 samples taken at the filter screens of an estuarine power plant cooling water intake showed that herring and sprat were strongly associated with each other and formed mixed species schools. Herring-dominated schools were typically larger, more frequent and contained larger-sized individuals than schools dominated by sprat. The mean body length of both herring and sprat was biased as a function of their relative importance in the school suggesting that the fish schools were assorted by size. However, switching to a fish school dominated by the other species increased the individual body length variation relative to the group average. Diets of both species overlapped strongly but the feeding rate of sprat was significantly lower than that of herring. Our results suggest that during estuarine residency young sprat suffer the consequences of the school trap, possibly to profit from reduced predation risks in herring schools.

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