After the feeding trial, fish from each treatment were collected and
randomly distributed into duplicate 100-L aquaria at a rate of 20 fish
per aquarium, and fish were exposed to 5.0 mg Zn/L; the sublethal concentration
of Zn was 64.0 mg Zn/L according to Abdel-Tawwab et al.
(2013), for 7 days