Abstract

To identify a simple tool for quick evaluation of quality of endangered Caspian brown trout, Salmo trutta caspius
eggs, the changes of pH (both in ovarian fluid and fertilization water), turbidity (both in ovarian fluid and
fertilization water), fertilization and eyeing rates were investigated in ovarian fluid samples containing perfect
eggs as well as different concentrations of broken eggs. The pH of ovarian fluid and water as well as fertilization
and eyeing rates decreased significantly (P<0.05) with increasing of broken eggs in ovarian fluid. In contrast, the
turbidity of ovarian fluid and water as well as mortality rate of eggs increased significantly (P<0.05) with
increasing of broken eggs in ovarian fluid. Also, significant correlations (P<0.01) were found between measured
parameters as follow: pH of ovarian fluid vs. pH of water and fertilization and eyeing rates; turbidity of ovarian
fluid vs. turbidity of water; turbidity of ovarian fluid and water vs. fertilization and eyeing rates. Our results
conclude that pH and turbidity of ovarian fluid and water effectively influence on efficiency of artificial
propagation. Therefore, these could be used as two simple tools for quick evaluation of quality of Caspian brown
trout eggs during artificial reproduction in the hatchery.

This work is licensed under a Creative Commons Attribution 4.0 License.