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Native to North America, largemouth bass  Micropterus salmoides  (Lacepède, 1802) were introduced in South Africa in 1928. Florida bass  Micropterus floridanus  (Lesueur, 1822) were introduced to enhance existing largemouth bass fisheries in 1980. While largemouth bass and Florida bass readily hybridise and produce offspring that are difficult to identify morphologically, confirmation of hybridisation requires genetic analysis. This study sought to understand: (1) the extent to which Florida bass spread within a catchment once introduced; and (2) whether a subset of samples taken from within a catchment accurately characterises hybridisation throughout the catchment. Samples were collected from the Breede River and Kowie River catchments and screened using 38 species-diagnostic single nucleotide polymorphisms to assess hybridisation. Collections from the mainstem of both rivers represented hybrid swarms, and neither pure largemouth bass nor Florida bass were observed. The absence of genetic differentiation among sampling sites suggests that hybridisation will occur throughout systems where both species are present. Hybridisation levels in dams located off the mainstem rivers were significantly variable and represented potential sources for Florida bass alleles observed within rivers. This finding, in conjunction with our limited knowledge of the distributions of the two species, suggests that applying independent management strategies to control and monitor the spread of both species may prove difficult.

The extent of hybridisation between largemouth bass and Florida bass across two river systems in South Africa