In the other case, trials on time-restricted feeding are
scarce or rare. Alanärä (1992) working with cage-reared
rainbow trout concluded that two feeding periods per
day, each of about 2 h, are sufficient for optimal growth.
In whitefish, Koskela et al. (1997) found that growth
among the fish and the length of the feeding period had
no significant effect upon feed conversion.