Presence of fish and crayfish in the eight streams at each sampling time, compared with historical presences.

Compiled from Raadik (1996) and Jackson and Davies (1983) as well as author's unpublished data from 2006–2007. Bold indicates species found upstream of weirs; underlined indicates rare or encountered infrequently (i.e. very patchily distributed, in one place in channel: not given for historical occurrences); # denotes almost all animals caught electrofishing the unregulated streams in 2007 were these species.