Queen Conch

Encountering a queen conch on a dive offers a relaxed, fascinating macroscopic observation opportunity. Divers can spot them resting on shallow sandy plains, seagrass beds, and coral rubble. Because conches possess surprisingly keen eyesight, approach them slowly and deliberately. When unthreatened, a conch will extend its long eyestalks from beneath its shell lip to observe surrounding divers, providing fantastic photography opportunities.

Divers must maintain proper neutral buoyancy and avoid touching or turning over conches. Lifting a conch causes immense stress and forces the animal to retract its soft body and proboscis inside its shell for protection. Look closely around the shell opening and mantle cavity without disturbing the snail; you may spot tiny commensal organisms, such as porcelain crabs or the small conchfish (*Astrapogon stellatus*), seeking shelter inside.

Remember that queen conches are heavily protected throughout much of their range due to historic overharvesting. Strict regulations govern them: for example, recreational and commercial harvest is prohibited in Florida, and the species is listed under CITES Appendix II and ESA Threatened status. Never handle or collect wild conch shells.

The best time to observe active queen conch populations coincides with their extended spawning season, which typically spans 4 to 9 months between March and October. Spawning activity reaches its peak during the warmest summer months from July to September, when sea surface temperatures rise to between 28°C and 30°C (82°F to 86°F).

During this peak reproductive window, adult queen conches migrate from shallower algal flats and grass beds towards deeper sandy areas near reef tracts. Here, adults form large spawning aggregations to facilitate internal fertilization. Observing these aggregations provides divers with a unique chance to witness adult conches interacting, courting, and laying sticky, crescent-shaped egg masses packed with hundreds of thousands of eggs.

Outside the primary summer spawning months, conches remain present year-round throughout their Caribbean and tropical Atlantic range. However, during cooler periods, individuals are more dispersed across shallow seagrass nurseries and sandy flats, where juveniles spend much of their time partially buried in the sediment to avoid detection.

Queen conches inhabit warm, shallow marine environments throughout the Caribbean Sea, the Florida Keys (extending north to St. Lucie Inlet), Bermuda, the Gulf of Mexico, and northern South America. Their specific habitat preferences vary significantly based on their developmental stage and age.

Juvenile conches reside primarily in shallow seagrass meadows—often at depths under 6 metres (20 feet)—where dense grass shoots (such as *Thalassia testudinum*) provide ample cover and food. Young juveniles spend their first year buried beneath the substrate to hide from predators. As conches mature into sub-adults and adults, they transition away from dense grass into open sandy algal flats, gravel, coral rubble, beach rock, and smooth hard coral patches.

Adult conches are most frequently encountered on broad sandy plains adjacent to coral reefs down to deeper benthic zones. These open sandy expanses allow adults to move freely, feed on benthic algae, and gather in large numbers along deep reef banks during their annual reproductive cycles.

Queen conches are herbivorous benthic grazers that feed continuously on plant matter and micro-organisms present on the seafloor. Using a muscular, tube-like mouth called a proboscis, the conch browses across substrate surfaces, scraping up food using specialized mouthparts.

Adult conches primarily consume various types of filamentous and epiphytic algae, green seaweeds (such as *Batophora oerstedi*), plant material growing within seagrass beds, and organic detritus. They also scrape diatomaceous films and microalgae off seagrass blades (*Thalassia testudinum*), coral rubble, and sand grains.

Juvenile conches have a similar herbivorous diet, feeding on diatoms, epiphytic microalgae, and organic detritus buried within sediments. During their early free-floating larval stage (veligers), which lasts 2 to 8 weeks before settling on the sea floor, conches feed exclusively on microscopic phytoplankton suspended in the water column. Grazing occurs throughout the day as conches slowly move across sandy flats and grass beds.