here's the deal,
foam, bubbles, and other surface disturbance are the coverage fish like
next,
wade pools are the funnel for food
finally,
fish have thrive in current and ue less energy at capturing their food

think of a sail boat on the lake
wth the wind, you go super fast
against the wind, you tack by using sail and rudder
no wind, you are stuck being still

next fish you catch, count how many sails, rudders, trim plates they have...or imagine the fins working seperately to optimise the current and add the ever canging shape of the body to adjust for resistence
Truly, if you snorkled under the fall at a wade pool, you will realize the magnificent creation of our creator and begin to think; is man at the top of the food chain ?