Article
Occurrence of four-spined Gasterosteus aculeatus in an isolated Croatian river population.
Journal of fish biology - 1 Nov 2009
Zanella L N, Zanella D, Mrakovcić M, Miletić M, Mustafić P, Caleta M
Abstract excerpt
An isolated population of the three-spined stickleback Gasterosteus aculeatus in Croatia was found to have a high incidence of specimens either having a fourth dorsal spine or showing remnants of a fourth spine. Juvenile individuals showed a 9.4% incidence of a fourth spine. The population was ex...
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