alpheus ochrostriatus
Look for this striped snapping shrimp in warm water off Tufi, Papua New Guinea, an uncommon but distinctive find on muck and reef dives.
A small, slender shrimp marked with fine longitudinal stripes running down a pale body, which is the main giveaway against similarly patterned reef shrimp. Like other snapping shrimp, it carries one noticeably oversized, club-like claw used to produce a sharp snapping sound, held close to the body when at rest. It moves in short bursts near the sand or rubble rather than swimming freely, usually staying close to a burrow entrance.
Divers typically find it stationed near a burrow opening in sand or rubble, staying close to cover rather than roaming the reef. It reacts to a close approach by retreating into its burrow, and its presence is often given away by the sharp snapping sound before the shrimp itself is spotted. Best looked for with a slow, patient scan of the substrate rather than a swim-past.
Snapping shrimp like this one produce their signature click by snapping a specialised claw shut fast enough to create a cavitation bubble, a sound loud enough to stun small prey and be picked up on underwater recordings.
Sightings sit in warm water between roughly 25.5 and 31.5 C, and there is not enough seasonal data to point to a particular month, so treat it as a year-round possibility on Tufi's reefs.
Reef neighbours a diver could mistake it for. Use the identification notes above to tell them apart.
Logged sightings so far come from Tufi, in Papua New Guinea, making it the only confirmed region for this species in diver records. It is worth watching for on muck-style and reef sites around Tufi rather than open water.
Mapping where Fine-striped Snapping Shrimp is logged…
Confirmed sightings come from Tufi, Papua New Guinea, where it turns up on reef and muck-style dive sites. It has not yet been logged elsewhere in diver records.
There is no clear seasonal pattern in the data, and it is found in consistently warm water between about 25.5 and 31.5 C, so it is a year-round possibility around Tufi.
Look for a slender shrimp with fine stripes along the body and one oversized snapping claw. It stays close to a burrow in sand or rubble rather than swimming in open water.
They snap an enlarged claw shut fast enough to create a collapsing bubble, producing a loud click used to stun prey or defend territory. It is one of the loudest sounds made by any marine animal relative to body size.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
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