Yep. Water Dog is right.

Where and when we catch fish may change year to year, but - it doesn't change, long term, as much as we may think.

The Lake ecology remains much the same. The Lake bottom doesn't change much (except when the zebra mussels showed up - now their shells are piled up). The rocky reefs and shoals are still there. The mud and silt and clay and sand bottoms are still there. The Lake wind driven waves and return currents remain the same. However, as changes are always happening, little shifts occur. Invasive species, such as the spiny water flea, change the way the ecosystem works. Prey species change in numbers and distribution. Predator fish then change their habits. It's a dynamic system, and we humans have changed it. More watershed runoff nutrients. Drained marshes. Commercial fishing back "in the day." Even the number of boats running around. It all comes down to making adjustments. The walleye and yellow perch and smallmouth bass, etc., are all still out there. We have to adjust, as they have.