When a brown bear eats a salmon, does the bear gain all of the energy contained in the body of the fish? Why?

Question

Explain why or why not

Answer 1

This has to do with the ecological pyramid and the 10% rule. Only 10% of the energy contained in the biomass of one trophic level is passed on to the next level. Where does the other 90% go? The fish used some of the energy. Some of the energy is locked up in parts that are not digestible. ....

Answer 2

the plant that the fish eats, get all its energy for the sun 90% of that energy is USED up by growing etc. the 10% left is given to the fish 90% of that energy is used for movement survival and growing the approximate 10% of the energy is passed to the bear. so all of the remaining energy is passed on.

Answer 3

No the bear only gains about 30% of the energy. The rest is lost as heat, etc.

Answer 4

For the second answer that principle is known as entropy in which nearly 75% of the energy in chemical reactions is lost as heat. This would apply to the chemical digestion portion of the bear's digestive process.