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Behavioral and clinical pathology changes in koi carp (Cyprinus carpio) subjected to anesthesia and surgery with and without intra-operative analgesics.

Fish surgery is becoming increasingly common in laboratory and clinical settings. Behavioral and physiologic consequences of surgical procedures may affect experimental results, so these effects should be defined and, if possible, ameliorated. We document behavioral and clinical pathology changes in koi carp (Cyprinus carpio) undergoing surgery with tricaine methanesulphonate (MS-222) anesthesia, with and without intraoperative administration of the opiate butorphanol (0.4 mg/kg intramuscularly) or the nonsteroidal antiinflammatory analgesic ketoprofen (2 mg/kg intramuscularly). For all fish combined, surgery resulted in reduced activity, lower position in the water column, and decreased feeding intensity at multiple time points after surgery. The butorphanol-treated group was the only one not to experience significant (P < 0.05) alterations from presurgical behaviors. Clinical pathology changes at 48 h after anesthesia and surgery included decreased hematocrit, total solids, phosphorus, total protein, albumin, globulin, potassium, and chloride and increased plasma glucose, aspartate aminotransferase, creatine kinase, and bicarbonate. The only clinical pathology difference between treatment groups was a lower increase in creatine kinase in the ketoprofen-treated group. No adverse effects of butorphanol or ketoprofen at these doses were identified. These results suggest a mild behavioral sparing effect of butorphanol and reduced muscle damage from the antiinflammatory activity of ketoprofen.