Strongylura marina
Silvery surface-dwellers logged off Florida and Rio de Janeiro year-round, comfortable from 13 to 28 C. Here's how to spot them.
Long, slender, pencil-like body up to about 78 cm, with an elongated beak-like jaw lined with fine teeth. Colouring is silvery on the flanks with a darker greenish-blue stripe running down the back, which helps it blend in when viewed from below against the surface glare. Look for it hovering just under the surface film or cruising in loose groups rather than down on the reef itself.
Divers typically spot these skimming just beneath the surface, often alone or in small loose groups, patrolling the top metre or so of water rather than mixing in with the reef community below. They tend to be flighty around bubbles and swimmers, darting off quickly rather than lingering, which is part of why most logs mark them as uncommon or rare rather than a guaranteed sighting.
Needlefish are ambush feeders that slash sideways through schools of small baitfish with their needle-like jaws, and they're known for occasionally leaping and skittering across the surface when startled, sometimes by boat engines or bright dive lights at night.
Sightings show no clear seasonal pattern, and with a wide observed temperature range of 13.3 to 28.0 C this fish turns up across most of the year in both regions. Treat it as a year-round encounter rather than something tied to a specific month.
Reef neighbours a diver could mistake it for. Use the identification notes above to tell them apart.
Most reliably logged in Florida, particularly around shallow coastal and inshore dive sites in the United States, with a smaller cluster in Texas and the US Northeast. Rio de Janeiro in Brazil is the other strong hotspot, making it a species you're as likely to run into on Brazilian coastal dives as on Florida ones.
Mapping where Atlantic Needlefish is logged…
Florida in the United States is the strongest spot, with additional sightings in Texas and the US Northeast. Rio de Janeiro in Brazil is the other major region where divers regularly log this species.
There's no strong seasonal pattern in the sightings data, and the species tolerates a wide temperature range from 13.3 to 28.0 C, so it's seen across the year in both Florida and Rio de Janeiro.
Look for a long, slim, silvery body with an elongated toothy beak, cruising just under the surface rather than near the reef. A dark stripe along the back and a habit of skimming the surface film are the giveaways.
They typically reach around 78 cm in length, giving them a distinctive pencil-thin, elongated profile in the water.
They are not considered dangerous to divers and typically dart away from bubbles and swimmers rather than approach. Any risk with needlefish generally involves surface skittering near boats or bright lights at night, not underwater encounters.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Ocean Sunfish
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