Eclosión de ovas y sobrevivencia de alevines de trucha arcoíris (Oncorhynchus mykiss), en un sistema cerrado de recirculación de agua.

Abstract

Abstract: The study focused on determining the optimal stocking density of rainbow trout eggs in the water recirculation system at the UTPL Agricultural Station, with the objective of improving the hatching and survival percentages of Oncorynchus mykiss fry. The investigation was carried out in the Cajanuma sector of the city of Loja. 18,000 eggs acquired in Papallacta were used, distributed in troughs with different densities of eggs per square centimeter: 173 (3000 eggs), 230 (4000 eggs), 288 (5000 eggs, control group) and 345 (6000 eggs). At the conclusion of hatching, it was found that the trough with a density of 345 eggs/cm2 of rainbow trout showed lower mortality (5.35%) and a high hatching rate (94.65%). It was confirmed that lower densities result in higher mortality; The trough with 173 eggs/cm2 had a hatching rate of 82.27% and a total mortality of 17.73% during the hatching phase. In the fry phase, a decrease in mortality was observed, with a total of 16,418 fry and only 1.08% of dead fry (178)