Quick answer
Search the Upper Lake edges with net mode equipped
Stay in the shallow lake and scan plant clusters, rock faces, and floor edges. Snails are much smaller and slower than fish, so they are easy to pass while moving at full speed.
Equip the Jungle Gun's net mode before the search. If the request asks for three and your route produces fewer, leave the area and repeat the shallow sweep on another cycle.
How to collect a snail
Aim net mode directly at the snail from short range. A lethal mode can destroy or reduce the quality of a tiny target, while the net secures it cleanly for the request or bestiary.
FAQ
Snail Locations questions
Are snails found in the deep lake?
The request route is a shallow-water search. Complete the Upper Lake edges before looking anywhere deeper.
What weapon catches snails?
Use the Jungle Gun's net mode at close range.