Any wild caught salmon or steelhead(a rainbow trout that has been out to sea) you find at your store is going to be from WA unless it says otherwise. Any of those fish shouldn't be used long term or as a main food. Wild WA fish is contaminated with PCB's and to a lesser degree, methyl mercury. It's so bad in CA and other places that the fish are inedible. For an adult human, more than 8oz a month of wild WA salmon is considered unhealthy. Alaskan and farmed salmon is cleaner. Tilapia is cleaner still. Before I knew this, I fed my adult concinnus' on wild coho for a month straight. One developed tremors which subsided after a week or two of no fish. That snake eventually died.

I don't want you to panic though. You can still feed them this stuff, just not a lot over a long term. You can even cook it before you feed it to them and that cuts down on contaminants.

Well here's a suggestion for the babies. Make sure the worm pieces are no bigger than their heads, completely dead, and count them. Perhaps put one piece per snake in there. If any are missing later, you'll know they're eating.

If you get the wrong kind of worms, do you eat those too?