We have always put the fish guts on shore, away from camp.  We also do this at home at the lake cabin too...they disappear more or less instantly, taken by gulls and eagles, sometimes four legged furry friends too.  
We cut the fish remains into manageable pieces for the birds.  Otherwise they try to pick them up, haul them into the water, and eventually lose them.  Once they sink, the gulls and eagles cannot get them, and then the guts are in the water and not too far from camp...defeating the purpose.
There was a long detailed discussion on this board, about a year ago ?  Thread is probably somewhere.  In it we discussed putting them in deep water...apparently on Trout lakes the Trout will make good use of them.  IC