Shoaling behaviour of the two-spotted goby

P. A. Svensson, I. Barber*, E. Forsgren

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

64 Citations (SciVal)


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. (C) 2000 The Fisheries Society of the British Isles.

Original languageEnglish
Pages (from-to)1477-1487
Number of pages11
JournalJournal of Fish Biology
Issue number6
Publication statusPublished - 30 Jun 2000
Externally publishedYes


  • Confusion effect
  • Dilution effect
  • Gobiusculus flavescens
  • Group living
  • Gullmarsfjord
  • Oddity
  • Schooling
  • Size assortment


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