Oh yes you can bet it did..... They just rot quickly and fall out. If it were a commercial net it would have a number tag on it (required for them).
I have seen (and found) so many abandoned tribal nets in the Columbia River when I was guiding for 6 years. Sometimes washed into an eddy and those had carcasses in them....
If they "lose" them, they are replaced by the Gov't, and a Yakima friend of mine told me they are supplied with new sets every few years. Not sure if that is still the case, but if you paid for them you surely would not just leave them floating around........

MC