The Israeli Journal of Aquaculture - Bamidgeh 52(3), 2000, 111-117

NEPHROCALCINOSIS IN INTENSIVELY REARED
RAINBOW TROUT (ONCORHYNCHUS MYKISS)

Aydin Fikri ¹ , Tunca Recai ² , Yavuzcan Yíldiz Hijran ¹ , Kul Oguz ²

1 Department of Fisheries and Aquaculture, Faculty of Agriculture, University of Ankara, 06110 Ankara, Turkey
2 Department of Pathology, Faculty of Veterinary Medicine, University of Ankara, 06110 Ankara, Turkey

(Received 18.6.00, Accepted 18.10.00)

Abstract

Intensively cultured rainbow trout (Oncorhynchus mykiss) in Central Anatolia, Turkey, developed nephrocalcinosis. Macroscopically examined kidneys were swollen. Ureters dilated two or three-fold had a sinuous appearance and were filled with a caseous material. Histopathologically examined kidneys had renal calcifications generally located at the collective tubules and in the lumens of ureters. Fish with a few renal lesions had stomach lesions. No skeletal muscle calcifications were observed. In all cases, varying degrees of fatty degeneration in hepatocytes were noted. The calcifying material in the ureters, when chemically analyzed, was found to consist of ammonium urate and calcium phosphate. The development of nephrocalcinosis is probably related to elevated CO2 concentrations and the hardness of water.

home