Sydney Lake is a Large, deep, cold water lake with a littoral
zone covering forty percent of the area and providing habitat
for both cold and warm water fish. Thermal stratification was
evident at the time of the survey. water temperatures ranged
between 70`F. and 45`F. in the upper one hundred feet of water.
The ten degree temperature drop (63`F. to 53`F.) between the
twenty five and thirty five foot depths identified the thermocline, the layer of water in which there was the most
rapid decrease in temperature. The dissolved oxygen content
varied very little to the depth of one hundred and twenty five
feet, and ranged between 9.4 and 10.0 parts per million. A
surface 7.6 pH value showed an alkaline characteristic, in
relation to the hydrogen ion composition in the water. A total
dissolved solids concentration of 16 parts per million was
determined from a surface conductivity reading. Light
penetration in this colorless water was indicated by the
disappearance of a secchi disc, from view, 26.0 feet below the
water surface.
FISH SPECIES PRESENT
Lake trout, yellow pickerel (walleye), northern pike, lake
whitefish, lake herring, burbot (lawyer or ling), white sucker,
red sucker, blacknose shiner,
spottail shiner, bluntnose minnow, fathead minnow, minespine
stickleback, trout perch, and iowa darter.
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