Effect of polyploidization on survival of sea, brook, and rainbow trout hybrids during incubation and early feeding period

Effect of polyploidization on survival of brook trout (Salvelinus fontinalis), sea trout (Salmo trutta morpha trutta) and rainbow trout (Salmo gairdneri) hybrids, including reciprocal crosses, during incubation and larval stages period was tested. The polyploidization induced by the thermal shock (28°C for 10 min., 40 minutes after fertilization) markedly increased hatching and fry survival when compared to the one for diploid hybrids

An influence of males on the viability and fertilization degree of trout eggs

An attempt to estimate the quality of milt obtained from trout males stripped three times was made. The estimation was carried out through examining the spermatozoa motility and verified by analysing the viability and fertilization degree of the experimental roe