Final answer:
The maximum depth that cold water fish will occupy at Erie 42 depends on temperature and oxygen levels. Cold water fish prefer temperatures between 4°C and 10°C and can be found in the thermocline region during summer, which often ranges from 10 to 20 meters deep.
Step-by-step explanation:
The maximum depth that cold water fish will occupy at Erie 42 can depend on several factors including the temperature, oxygen levels, and the specific species of fish. Typically, cold water fish thrive in temperatures ranging from 4°C to 10°C (39°F to 50°F), and they usually prefer the colder, well-oxygenated layers of water. The thermal stratification of a lake can cause these colder layers to be found at different depths, depending on the time of year and the physical characteristics of the lake.
Without specific data about temperature profiles or the species of fish in question, it's difficult to provide an exact maximum depth. However, as a general rule, during the summer months, when lakes are stratified, cold water fish can be found in the thermocline region, which is the layer of water in a lake that transitions between warmer water at the surface and colder deep water. The depth of the thermocline can vary but often ranges from 10 to 20 meters (33 to 66 feet) in temperate lakes. During other seasons when mixing occurs, fish may occupy different depths.