Sound one of the largest and deepest Bays in GB
9207 ha, 112 m maximum depth, 41 m mean
Shallow channel joining to GB (12 m)
No commercial fishing
isolation of Parry Sound from Georgian Bay, combined with few local streams
being suitable for sea lamprey reproduction, likely reduced the effect of sea
lamprey predation on these lake trout and saved them from extirpation.
1958 lamprey parasitism was 45 time higher than that observed in 1988 to
lake trout are able to survive lamprey attacks better than small fish.
The absence of a commercial fishery
prevented the combined effects of sea lamprey parasitism on smaller lake trout
and exploitation of larger/older fish which led to the extirpation of other
stocks in the Great Lakes.
This lack of commercial fishing allowed the larger Parry Sound
lake trout to survive until sea lamprey control was initiated in the early
lamprey and a continuing sport fishery appears to have prevented
rehabilitation, however, and kept the population numbers depressed.