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28 June 2011 Pectoral Fin Morphology as a Reliable Field Sexing Characteristic in Populations of the Invasive Oriental Weatherfish (Misgurnus anguillicaudatus)
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Abstract

Invasive Oriental Weatherfish (Misgurnus anguillicaudatus) populations have become established in many countries worldwide. To understand the invasive potential of this non-indigenous species, information about its demography and life history within these novel habitats is needed. Here we present data supporting the use of pectoral fin morphology for determining sex within a population of weatherfish in and around Boise, Idaho, USA. Enlargement of the second pectoral-fin ray and presence of a lamina circularis was seen in males both mature and immature. No such morphology was seen in females. Examination of gonadal tissue confirmed external sex determination in 99% of mature females, 97% of mature males, and 70% of juveniles less than 10 cm total length. This study is the first to verify use of sexually dimorphic fin characteristics as a field diagnostic in an invasive population of Oriental Weatherfish.

2011 by the American Society of Ichthyologists and Herpetologists
Alexander N. Urquhart and Peter Koetsier "Pectoral Fin Morphology as a Reliable Field Sexing Characteristic in Populations of the Invasive Oriental Weatherfish (Misgurnus anguillicaudatus)," Copeia 2011(2), 296-300, (28 June 2011). https://doi.org/10.1643/CI-10-027
Received: 12 February 2010; Accepted: 1 February 2011; Published: 28 June 2011
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