Suggestions (if salmon carcass placement is to continue):

Concentrate the available carcasses (resources) in a few streams and use the others for controls.
Measure productivity of supplemented and un-supplemented streams for several generations, then switch treatments for half of the control streams. The response should distinguish between whether the carcass placement functions as aquaculture or restoration.

If you are going to put carcasses in the rivers, please learn something from it!

Concentrate the available carcasses (resources) in a few streams and use the others for controls.