Notes From the FieldOyster Reef Ecology | On the ReefWildlife in North Florida- Critters Big and Small Notes From the Field: Hermit Crab/Crown Conch Cage Match by Hanna March 11, 2013 by Hanna March 11, 2013 To get a handle on the oyster mortality problem south of St. Augustine, Hanna Garland staged “cage matches” between the oyster-eating crown conch and one of its predators, the thinstripe hermit crab.