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Shoaling behaviour of the two-spotted goby
Svensson, P.A.; Barber, I.; Forsgren, E. (2000). Shoaling behaviour of the two-spotted goby. J. Fish Biol. 56(6): 1477-1487. https://hdl.handle.net/10.1111/j.1095-8649.2000.tb02158.x
In: Journal of Fish Biology. Fisheries Society of the British Isles: London,New York,. ISSN 0022-1112; e-ISSN 1095-8649, more
Peer reviewed article  

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Keyword
    Gobiusculus flavescens (Fabricius, 1779) [WoRMS]
Author keywords
    schooling; group living; size assortment; dilution effect; confusion effect; oddity; Gullmarsfjord

Authors  Top 
  • Svensson, P.A.
  • Barber, I.
  • Forsgren, E.

Abstract
    Naturally formed shoals of adult Gobiusculus flavescens in a Swedish fjord ranged in size from a few individuals to several hundred fish and were sorted by body size. Shoal composition was highly dynamic and any particular group was unlikely to remain together for more than a few hours. Shoaling tendency of juveniles in laboratory experiments was high, and consistent preferences were demonstrated for numerically larger shoals. Large test fish preferred to associate with shoals composed of large, over shoals composed of small fish, whereas small test fish associated with both size classes equally. The ecological importance of shoaling in small shallow water fish is discussed, and possible mechanisms for the observed patterns are proposed.

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