Banded Trochus Snail (Trochus maculatus): Breeding Notes

Trochus maculatus is a top snail that grazes algae. Trochids are broadcast spawners with separate sexes and short-lived planktonic veligers, so home reef breeding is impractical despite simple hatchery culture.

Overview

Trochus maculatus is a pyramidal-shelled top snail of the family Trochidae that grazes algae and cyanobacteria from rock and glass. Trochus snails are valued algae grazers and, unlike many reef snails, can right themselves when flipped.

Sexing

Trochus snails have separate sexes that cannot be distinguished externally; in hatcheries sex is identified only when animals release eggs or sperm during induced spawning.

Conditioning

In hatchery work on commercial trochus, mature adults spawn readily on a monthly lunar cycle, and large adults are highly fecund, releasing on the order of 0.5–1 million eggs; specialised equipment is not required to induce spawning.

Spawning & Eggs/Larvae

Fertilization is external. Eggs hatch into trochophore larvae that become non-feeding (lecithotrophic) veligers; in trochus the planktonic phase is short, with hatchery settlement reached within roughly three to five days. No trochoidean veligers are known to feed.

Common Challenges

Even with a short larval phase, water movement, filtration and predation remove the planktonic veligers in a typical reef tank, so self-sustaining populations are not realistic without a dedicated rearing setup.