That is when trout are likely to feed on zooplankton exclusively.
(That; is; when trout are likely to feed on zooplankton exclusively) (trout; are; likely to feed on zooplankton exclusively) (trout; to feed; T:exclusively)
That trout trout
is are to feed
when trout are likely to feed on zooplankton exclusively
likely to feed on zooplankton exclusively
T:exclusively