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pygmy smelt
The pygmy smelt (''Osmerus spectrum'') is a North-American freshwater fish in the Osmeridae family. It is found in a number of deep, thermally stratified lakes in eastern Canada and New England (United States).
The pygmy smelt coexists with the rainbow smelt ''Osmerus mordax'', and is distinguished from it by slower growth, earlier maturation, shorter life span, later spawning time, and use of smaller food items.
Genetic data suggest that the pygmy smelt occurrences in each lake have evolved independently from the rainbow smelt lineage, which calls the identity of the pygmy smelt as a species into question.〔Taylor, E.B., Bentzen, P. (1993). Evidence for multiple origins and sympatric divergence of trophic ecotypes of smelt (Osmerus) in northeastern North America. Evolution 47: 813-838.〕 Another, intermediate form of smelt has been identified in Lake Utopia, New Brunswick, which is genetically distinct from local rainbow smelt but is able to hybridize with it.〔Bradbury, I.R., Bradford, R., Bentzen, P. (2011). (Genetic and Phenotypic Diversity and Divergence in Sympatric Lake Utopia Rainbow Smelt (''Osmerus mordax''). ) DFO Can. Sci. Advis. Sec. Res. Doc. 2011/008: vi + 28p.〕
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