“…Li et al (2006) found that increasing stocking density induced the expression of stress related protein HSP70 in rainbow trout. Aksakal, Ekinci, Erdogan, Beydemir, Alm, & Ceyhun (2011) found increasing stocking density elevated mRNA levels of HSP70 in rainbow trout. HSP70 mRNA level in liver of tilapia increased obviously after 48h acute crowding stress (Qiang, Yang, He, Wang, Xu, & Zhu, 2014).…”