Histology of cultured channel catfish, Ictalurus punctatus (Rafinesque) |
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| Authors: | R. W. Soderberg M. V. McGee C. E. Boyd |
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| Affiliation: | Department of Fisheries and Allied Aquacultures, Auburn University Agriculture Experiment Station, Auburn, Alabama 36849, U.S.A. |
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| Abstract: | Dissolved oxygen and un-ionized ammonia concentrations were monitored in 12 0.04 ha earthen ponds stocked with 10 000 channel catfish, Ictalurus punctatus ,/ha. Gill, liver and trunk kidney tissue samples were removed periodically for histological examination. Total ammonia and dissolved oxygen levels were in the ranges reported for catfish culture at this level of intensity. Average un-ionized ammonia nitrogen concentrations ranged from 20 to 67 μgh−1 and average daily maxima ranged from 63 to 183 μgh−1. Gill lesions characteristic of un-ionized ammonia exposure were common in fish from all ponds. |
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