Mystery snail vs channelled apple snail
Both are Pomacea, both are sold as apple snails, and one of them will strip a planted tank. Which is which?
Short answer
Pomacea bridgesii largely leaves healthy plants alone; P. canaliculata eats them, which is why it is one of the most damaging aquatic invasive species in the world. Both are caught by the same EU plant-health measure, because that instrument is drawn at genus level.
Side by side
| Dimension | Mystery snail | Channelled apple snail | Favours |
|---|---|---|---|
| Eats living plants | Largely not | Yes, readily | Mystery snail |
| Shell suture | Shallow, rounded | Deep, squared 'channel' | — |
| Adult size | 4–6 cm | 4–8 cm | — |
| Egg clutch | Pink, above the waterline | Pink, above the waterline | Neither |
| EU position | Caught by the genus-level Pomacea plant health measure | Caught by the same measure | Neither |
| Agricultural pest status | Not significant | Major rice pest across South-East Asia | Mystery snail |
Which to choose
Mystery snail
Choose the mystery snail if you want a large snail in a planted tank and your jurisdiction permits Pomacea at all.
Channelled apple snail
There is no aquarium reason to choose the channelled apple snail over the mystery snail. It is documented here because it is confused with one, not because it is recommended.
One caveat
The EU restriction on these animals is a plant health measure under Commission Implementing Regulation (EU) 2024/2013, not an entry on the invasive alien species Union list — a distinction AquariumHQ got wrong in Mega Sprint 2 and has corrected twice since. AquariumHQ has not read the operative text, so what follows for a snail already in a private aquarium is not stated. Check with the national plant health authority before acquiring, selling or moving either species.