Sand Sifting Conch (Strombus maculatus): Breeding Notes

Strombus maculatus is a small reef conch with separate sexes and gelatinous egg strands that hatch into planktonic veligers. Dwarf conchs are a notable exception among reef snails, sometimes producing crawl-away young in mature tanks.

Overview

Strombus maculatus is a small reef-dwelling conch of the family Strombidae that sifts sand for detritus and microalgae and bears the characteristic stalked eyes of the group. Conchs are herbivorous and detritus-feeding sand dwellers.

Sexing

Conchs are gonochoristic (separate sexes) with internal fertilization. External sexing of this small species is not documented in the sources reviewed; sexes are confirmed mainly during pairing and egg-laying.

Spawning & Eggs/Larvae

In Strombidae, females lay long gelatinous egg strands, and after internal fertilization the eggs hatch into pelagic veligers that feed and develop in the plankton before metamorphosing; in the well-studied queen conch metamorphosis occurs roughly 16–40 days after hatching. Because dwarf conchs may settle quickly, mature reef tanks occasionally see surviving benthic juveniles.

Common Challenges

Even in this exceptional group most larvae are lost to filtration and predation, so large-scale captive recruitment remains difficult; a deep, biologically rich sand bed improves the odds of crawl-away survivors.