If I'm right, the phrasing in the question is slightly misleading, so I can only assume that your intent is to ask why not all the energy in minnows gets passed onto the pike that eat them. If this is the case (edit this and remove if wrong), the answer you is looking for is:
Not all of the energy is passed on from the minnows to the pike that eat them as the minnows have to use most of their energy, around 90-95%, just living and finding food. This is the same further the down in the food chain. So this way, the trout eating the minnows do not get all the energy.
Like all animals, minnows get their energy from the food they eat.
Insects and very small fish, like minnows.
Pike are the eating machines of fresh water. They will strike at almost anything that moves in or on the surface of water. Minnows, worms, mice, insects and lures of every sort.
no, sharks do not eat minnows. dolphins do, though.
frogs can eat minnows
Yes, raccoons will eat minnows as well as larger fish.
It depends. Some will and some won't. Crappies are know to eat minnows.
Flounders eat minnows.
no
algae
no
An African clawed frog would probably eat the minnows.