Aspects of the natural history of the swordtail jawfish,Lonchopisthus micrognathus(Poey) (Pisces: Opistognathidae), in south-western Puerto Rico

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Abstract
The burrow-dwelling jawfish, Lonchopisthus micrognathus, occurs at 12–40 m depths on sandy-mud substrates in back reef areas off southwestern Puerto Rico. Its behaviour is remarkably similar to Opistognathus aurifrons. It feeds on suspended material in the water. The burrow has a primary opening with a vertical tube and smaller accessory openings. A crab, Chasmocarcinus cylindricus, occurs with it. Lonchopisthus micrognathus broods its eggs orally and may spawn the year round. Availability of suitable sediment is not limiting distribution of the species.