dead snail shells with holes

[Scavenger]

Originally Posted by draco

what should we use for bait in the trap?

Pretty much anything seafood and meaty that isn't going to pollute your water. Ie krill, uncooked shrimp, oyter, clam ect. I'd personally avoid oily meats such as salmon ect. (had my skimmer going nuts)

Do you know how to make a bottle trap??

I wouldn't discount the whelk theory, it just seems strange to me that the shells are in the same area. Sounds to me like a pretator with a burrow and hunting area. Just my one point three cents.