ATTEMPTS OF INDUCTION OF SEX-REVERSAL IN CARP (CYPRINUS CARPIO VAR. KOI) USING TESTOSTERONE UNDECANOAT

sexreversalprotocols to obtain inverted males (XX) and which are the consequencesusing this hormone for koi carp. To induce sex-reversal, we chose to feed a normalmixed-sex progeny of koi carp with food mixed with 30 (V1), 60 (V2) and 90 (V3) mgTU / kg food, starting at the age of 30 days for a period of 60 days. When fishes had3 months old, they were moved into a bigger aquarium and they were fed withouthormones until the age of 6 months when some of fishes were sacrifices to takesamples for histological studies. At this age the main morphometric traits wereregistered. Our results indicated that the mortality percent raise dependent by thequantity of TU from food, with a maximum value in variant V3 (90 mg TU / kg food)where it reached 64% in koi carps until the age of 3 months. Total length was thesingle trait that registered significant differences (p0.01 and p0.05) whencomparisons among control and all the other experimental variants were made. Thissuggests that TU treatment significantly reduced length growing of the carps even itwas administered in dose of 30, 60 or 90 mg / kg food. Supplementation of food withTU modified sex ratio in studied fishes