No crayfish were captured in 11% of the quadrats sampled in
both years, but single crayfish were missed in
two quadrats sampled in 2005, resulting in
crayfish being absent from only 9% of all
quadrats. There was no apparent pattern in the
size of virile crayfish exposed on the substrate
and the sizes of crayfish missed appeared to be
in proportion to the size structure of captured
virile crayfish.