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Crosson Lake Crayfish


This piece consists of a glass jar containing crayfish preserved in liquid. The jar is approximately three-quarters full of amber-colored liquid, which contains approximately 18 complete crayfish specimens. The jar is labelled with masking tape and has a plastic screw-top lid.

Accession Number: 2016.zoo.55

Alternative Name:

Primary Materials:

Glass, plastic, crayfish, unidentified liquid


On the masking tape label: “Crosson Lake July-Aug ’79”
On the bottom of the glass jar: “11 8 438”

Dimensions (cm): Length = 9.5, Width = 9.5, Height = 17


This is a biological sample (a wet specimen) taken to study the crayfish population in a freshwater lake.


Good. The liquid in the jar appears to have evaporated somewhat, as there is residue on the glass approximately one centimetre above the current level of liquid. The crayfish are generally well-preserved, though some of hem are slightly damaged. The lid of the jar is dusty, with some sticky residue.

Associated Instruments:


Date of Manufacture: July-August 1979


This was collected from the laboratory of Dr. Harold Harvey, rm 419 in the Ramsay Wright Zoological Laboratories building at U of T, in November of 2016.

Additional Information and References:

Crosson Lake is a lake near Bracebridge, Ontario in Bigwind Lake Provincial Park.

Historical Notes:

Dr. Harold Harvey is a biologist specializing in several aspects of the biology of freshwater fishes. He has studied the effects of acid-stressed lakes on benthic ecosystems. He was a major scientific expert during a period in which policy makers sought to curb the effects of sulphur dioxide emissions in the Great Lakes Region.


  • Donated to UTSIC