Does a summer smallmouth have to move deep?
A thermocline is a temperature gradient, not an oxygen measurement or a barrier every bass refuses to cross. Deep water can retain oxygen in some lakes and lose it in others. Vegetation also consumes oxygen at night; dense or dying weeds are not automatically the best habitat. Combine fish and forage observations with local profiles where available. Compare current, healthy weed edges and adjacent depths rather than assigning all fish to one side of the thermocline.
The full story
This answer is one piece of a longer lesson — setups, diagrams and the reasoning behind it.
Same topic, other species
- Why are summer crappie pinned to one exact depth band? — Crappie
- How does the thermocline affect where largemouth hold in summer? — Largemouth Bass
- Why do muskie suspend over open basins in summer? — Muskellunge (Muskie)
- Is there enough oxygen in the deep basin under the ice? — Yellow Perch
- Why can't big pike just go deep in summer where the water is cold? — Northern Pike
- Why do trout lakes need to be deep or spring-fed? — Trout (Rainbow · Brook · Lake)
- How does the thermocline decide where summer walleye live? — Walleye