In Midsummer, You Are Fishing at a Lake

Multiple Choice

In midsummer, you are fishing at a lake. You catch the most fish at the inlet of a stream into the lake, where logs and branches are creating turbulent flow and mixing deep water with the shallow water near the surface of the lake. What is the probable reason the fish are congregating in this area?

A) This area is cooler, which stimulates metabolism.
B) This area has higher oxygen content, aiding gill oxygen uptake.
C) This area is warmer, which stimulates metabolism.
D) This area has a lower oxygen content, which helps to transfer oxygen into the fish's gills.
E) None of the above apply.