the present research was aimed to study the effects of different sources of carotenoids and their varying concentrations on the reproductive functions of goldfish. the study was carried out in seven treatments with three replicates at the bony fish hatchery complex (rasht, iran) from december 2011 to may 2012. experimental diets containing 50, 100, and 150 mg kg-1 astaxanthin and 50, 100, and 1...
