Histological and computed tomographic evaluation of a parasitic conjoined twin in hybrid catfish ( I ctalurus punctatus [ R afinesque] X I ctalurus furcatus [ L esueur])

Abstract

There is growing use of hybrid catfish ( I ctalurus punctatus ♀ X Ictalurus furcatus ♂) in commercial aquaculture to utilize hybrid vigour to improve production A conjoined twin specimen found during the course of production studies by the U nited S tates D epartment of A griculture C atfish G enetic R esearch U nit ( USDA ‐ CGRU ) was submitted to the A quatic R esearch and D iagnostic L aboratory ( ARDL ). After preliminary inspection, it was transported to M ississippi S tate U niversity, C ollege of V eterinary M edicine for further evaluation. The specimen was examined using both computed radiography and computed tomography antemortem. Following humane euthanasia, the specimen was examined both grossly and histologically. Tissues from both fish were also submitted for genetic analysis to determine whether twins were derived from the same egg. This report records the presentation and examination of a pair of conjoined hybrid catfish ( I . punctatus X I ctalurus furcatus ).

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