“…Due to problems of using fishmeal (high price, variable quality, availability, etc. ), most studies have focused on alternative sources of fishmeal including land plant sources and algae (Bilgüven & Barış, ; Collins et al, ; Teimouri, Amirkolaie, & Yeganeh, ; Trejo‐Escamilla, Galaviz, Flores‐Ibarra, González, & Lopez, ; Xie, Liu, Zeng, Niu, & Tian, ). According to amino acid profile of PHs derived from fish species such as that of rainbow trout's viscera (Taheri, Anvar, Ahari, & Fogliano, ), fishmeal and soybean meal (Halver, ), as well as due to the needs of such fishes as rainbow trout (Webster & Lim, ), most studies have also been carried out to apply PHs as an alternative to fishmeal.…”