(Evaluation of spermatozoa concentrations by spectrophotometric method of rainbow trout, Salmo irideus Gibbons, sêmen.)

Abstract

With the objective to simplify the evaluation of spermatozoa concentration, 116 sperm samples of rainbow trout, Salmo irideus Gibbons, were analyzed by the spectrophotometric method. The percentage of transmittance was related with hemocytometer count of spermatozoa per mm³ (Neubauer Improved). The regression equation and the correlation coefficients were found to be: Y = 33.80 - 0.33 X, r = -0.88* and Y = 36.17-0.35 X, r = -0.89* for wavelengths 410 mµ and 525 mµ respectively, where Y represents the spermatozoa concentration per mm³ and X, the percentage of transmittance. The average values of transmittance were 52.82% and 56.89% for, respectively, the two wavelengths above and the hemocytometer count average was 16.48 X 10⁶ spermatozoa per mm³.