Thermal effects in rainbow trout ( Oncorhynchus mykiss ) F1 embryos (farmed female x wild thermal‐resistant male)

CRICHIGNO, SONIA ALEJANDRA; ORELLANA, MABEL; LARRAZA, RODRIGO; MIRENNA, GUILLERMO; CUSSAC, VÍCTOR ENRIQUE

JOURNAL OF FISH BIOLOGY

WILEY-BLACKWELL PUBLISHING, INC

Año: 2021

0022-1112

The aim of this work was to investigate the response of rainbow trout embryos(Oncorhynchus mykiss) (i.e., survival, size at hatching, time to hatching,malformations) to four incubation temperatures (5.8, 8.9, 14.0 and 16.8°C), taking intoaccount the origin of the male parental genome and comparing pure farmed and F1embryos (farmed female x wild thermal-resistant male). Several consequences ofthermal stress were observed: lower ATU at hatching at high temperatures, and lowersurvival, shorter hatched free embryos and less-consumed yolk sac at extremetemperatures. The effect of the thermal-adapted male parental genome was shownonly in the lower percentage of incompletely hatched free embryos in the F1 families. Itappears that to obtain greater modification of thermal performance during earlydevelopment, the adapted genome of the wild thermal-resistant population has to beincluded through maternal inheritance, thus producing a stabilized strain selected fordomesticity, growth, and thermal adaptation.