Breeding the Hercules Snail (Brotia herculea)
Brotia herculea is a large gonochoristic, viviparous river snail from Myanmar and Thailand that broods its young. Captive breeding is poorly documented; this guide covers genus biology and flow-rich care.
Overview
Brotia herculea, the giant tower cap snail, is a large freshwater snail from Myanmar and Thailand in the family Pachychilidae, first described by Gould in 1846. It has a large, turreted shell on which axial ribs are highly variable. It is popular in the ornamental aquarium trade and is considered low-risk for invasiveness.
As a member of the genus Brotia it is gonochoristic and viviparous, retaining developing eggs and young in a special brood pouch. The IUCN Red List classifies the species as Least Concern.
Sexing
The separate sexes cannot be reliably distinguished by external features, so keeping a group is necessary to have both a male and a female in the same tank.
Conditioning
Condition adults by recreating their fast-flowing river origin: strong current, high oxygen and dim lighting in hard, alkaline water. The large adults graze biofilm and detritus and need a sizeable, mature tank with ample grazing area.
- Temperature: 22-28 °C (72-82 °F)
- pH: 7.5-8.5 (alkaline)
- GH: 10-20 °dGH
- KH: 6-14 °dKH
- Minimum tank volume: 80 L with strong flow
Breeding Setup
A spacious river-style aquarium with powerful flow, high oxygenation and subdued light best suits this large species. Hard, alkaline, well-oxygenated, high-quality water is the main reproductive requirement, but captive breeding is rarely reported.
Reproduction & Young
Brotia are viviparous: rather than laying eggs they brood their young in a pouch and release them as fully formed miniature snails. Reproductive output in the genus is very low, with brood pouches found to contain only a single juvenile, so any successful births in captivity are gradual and few.
Common Challenges
Detailed breeding accounts for this species are scarce, reflecting both the demanding high-flow husbandry and the genus's minimal single-juvenile output. Soft or unstable water damages the heavy shell. Keep away from loaches and pufferfish.