Tarpon Snook Blenny

The Tarpon Snook Blenny, more formally known in the aquarium and scientific literature as the Bluethroat Pikeblenny (Chaenopsis ocellata), belongs to the pikeblenny genus Chaenopsis within the family Chaenopsidae (tube blennies), found throughout the western Atlantic and Caribbean. Its common regional name references the very slender, elongated, torpedo-like body shape it shares with juvenile tarpon and snook, though it is unrelated to either fish taxonomically. Unlike true blennies, pikeblennies live inside empty invertebrate tubes or burrows on sand and seagrass flats rather than on rocky reef surfaces. The species is not considered threatened and is a distinctive, if less commonly noticed, member of the reef and seagrass fish community in its range.

• Body: extremely elongated and slender, eel-like, pale tan to sandy, typically 8-10 cm
• Head: long, pointed snout distinct from the blunter heads of true combtooth blennies
• Fins: tall, banner-like dorsal fin often marked with a dark eyespot near the front
• Display feature: breeding males develop a vivid blue-and-orange throat patch, flared during territorial and courtship displays

The pointed snout, extreme body elongation, and tube-dwelling habit separate this species from stockier reef blennies such as the Redlip Blenny. The bright blue-orange throat display in males is diagnostic when visible and not shared by most other small reef blennies.

This species is found on sandy bottoms, seagrass beds, and sparse rubble flats adjacent to reefs throughout the western Atlantic and Caribbean, typically in shallow water less than 20 meters deep. It depends on abandoned tube-worm burrows or other small holes in the sediment for shelter, rarely straying more than a short distance from its chosen tube. It favors warm, clear coastal waters and is often overlooked due to its habit of retreating fully into its burrow when approached, with usually only the head visible above the sediment.

Tarpon Snook Blennies (Bluethroat Pikeblennies) are solitary, territorial residents of a single tube or burrow, which they rarely leave except to feed or when displaced by a rival. Males perform conspicuous territorial and courtship displays, rising partway out of the burrow and flaring a vivid blue-and-orange throat patch alongside an erect dorsal fin to warn off rivals or attract females. Feeding consists of quick strikes at small planktonic and benthic invertebrates passing near the burrow entrance. After courtship, females deposit eggs inside the male's burrow, where he guards and aerates the clutch until hatching. This sit-and-wait strategy, combined with strong site fidelity, makes the species an example of a niche seagrass and sand-flat micro-predator distinct from the free-ranging blennies of rockier reef zones.