Fingerling channel catfish Ictalurus punctatus exposed to simulated ultraviolet-B radiation at an average daily dose of 2.9 J/cm2 were quite sensitive to the radiation. After a 24-h exposure, thinning of the most dorsal epidermis frequently was accompanied by edema. Compared with epidermis of unexposed fish, mucous cells in exposed fish were less superficial and club cells were less numerous both dorsally and high on the lateral surface of the body. Sunburn cells with pyknotic nuclei were evident in the epidermis of exposed fish. Among fish exposed for 48 h, focal necrosis and sloughing of the outer epidermal layer were widespread. A methanolextractable skin substance that is associated with resistance to sunburn in other fish species was not detected in channel catfish.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of Aquatic Animal Health|
|State||Published - Jun 1999|
All Science Journal Classification (ASJC) codes
- Aquatic Science