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Systematics of the North American menhadens: molecular evolutionary reconstructions in the genus Brevoortia (Clupeiformes: Clupeidae).
A major downfall of these studies has been a paucity of adequate gene loci developed for the genus Brevoortia, and this has ultimately resulted in limited resolution in addressing population structure and hybridization among Brevoortia congeners in the Gulf of Mexico (Anderson, 2007; Anderson and Karel, 2007; Anderson and McDonald, 2007).
Primer pairs were designed around microsatellite regions initially isolated from another clupeid, American shad (Alosa sapidissima Wilson, 1811); these primers have subsequently been evaluated for examinations of the genus Brevoortia (Anderson and McDonald, 2007).
None of the individuals examined had the enlarged and fringed median scales preceding the dorsal fin, which are an adult characteristic of the genus Brevoortia. Ventral scutes also began forming around 15 mm, and the full complement of 27-31 scutes (McEachran and Fechhelm, 1998) was found by 19 mm.