Characteristics of female rainbow trout eggs with different maturation rates

The biotechnics of trout breeding in recycled water supply installations, based on the constancy of the temperature regime (10-12 °C), led to the appearance of females with double maturation during the year. Bicyclic females are characterized by a shortened period of gametogenesis, which is usually accompanied by a lag in growth and the production of smaller eggs, unlike fish with a single spawn. The weight and size of salmon eggs are one of the main parameters that determine the quality of eggs. This trait is the final criterion in the evaluation and the initial one in the evaluation of offspring, therefore, the characterization of bicyclic females in terms of egg quality is important in breeding work. This served as the basis for studying accelerated trout maturation, the understanding of which can contribute to unlocking the biological potential of a popular aquaculture facility. The paper presents experimental data on the individual assessment of trout producers of the Adler (Adler breeding plant) and Rofor (FSGCR) breeds with different spawning rates in a comparative aspect.