Tench is one of the most valuable species in freshwater aquaculture. However, slow growth rate does not allow obtaining marketable products of this species on a significant scale, since it is currently used mainly as an additional object of aquaculture. The study on artificial reproduction consisted of two experiments and, respectively, was conducted during 2021 and 2022 in the incubation workshop of the Karpatskyi Vodohrai Fish Farm, located in the city of Pustomyty, Lviv Oblast. The objects of the study were mature age-4-7 brood tench and the sexual products obtained from them. In the first series of experiments, 2 females and 10 males were used in each experiment; in the second experiment, 5 females and 15 males, respectively. Common carp pituitary gland and a Hungarian synthetic analogue Ovopel were used as a hormonal stimulator during the spawning campaign in the first year of the study, while Prissian carp pituitary gland and Ovopel were used in the following year. The average individual body weight of females used in the study ranged 1.4 to 1.8 kg. At the same time, females produced more than 200 g of eggs that varied from 12.1% to 14.9% of the female's body weight. In both experiments where the synthetic analogue was used as a stimulating drug, this value was higher by 2.8% and 2.1%, respectively. On average, 1 g contained 365.8 eggs, ranging 330-395 eggs. Accordingly, the industrial fecundity in the first experiment was in the range of 60.0-89.4 thousand eggs, with the average value 81.7 thousand eggs in Test I and 66.5 thousand eggs in Test II. In the second experiment, the variation range was 55.4-117.3 thousand eggs, with the average of 79.5 thousand eggs in Test I and 75.0 thousand eggs in Test II. On average, 48.6 thousand eggs were produced per 1 kg of the female's body weight in the first experiment and 51.6 thousand eggs in the second. The average weight of the males used in the experiments ranged from 728.0 g to 1,008.0 g. At the same time, the average ejaculate volume was 0.59 mm³ in the first experiment and 0.78 mm³ in the second. According to this parameter, the superiority of the males stimulated with the synthetic hormone was 11.1% in the first experiment and 7.4% in the second. The males stimulated with the common carp hormone had 3.8% higher rate of duration of active movement, while the males stimulated with the pituitary gland of the Prussian carp were, on the contrary, inferior by 12.2%. Fertilization rates in both experiments were higher in the experiments where the broodstocks were stimulated with the naturally occurring hormone. The superiority was 1.5% in the first experiment and 3.3%in the second. However, according to the survival rate, larvae obtained from the females stimulated with the artificial hormone had 10.9% higher rate in the first year of study and 2.3% lower in the second year. Therefore, the research results confirm the perspective of using preparations of natural and synthetic origin for the artificial reproduction of tench and contribute to obtaining viable fish seeds that can be used in the future to obtain marketable products or to release fish to natural water bodies so as to support natural populations for commercial, sport or recreational fishing. [ABSTRACT FROM AUTHOR] more...