Elacatinus oceanops
A tiny blue-striped goby most commonly logged on Florida reefs, comfortable year-round in 24.5 to 28C water.
Barely 4cm long, this goby is instantly recognisable by the electric-blue stripe running from nose to tail against a jet-black or dark blue body. It sits still on coral heads, rocks, or sponges rather than swimming in open water, and the stripe seems to glow even in low light. There's no dramatic difference between males and females that divers would pick up on underwater.
Look for it parked motionless on a coral head or sponge, often near a cleaning station where it picks parasites off larger fish that stop by. It's not shy but it is small and stationary, so divers tend to spot it only when they slow down and look closely at reef structure rather than mid-water. Most sightings are logged as uncommon, meaning you'll need a careful eye rather than a lucky glance.
Neon gobies run cleaning stations, picking parasites and dead tissue off passing fish, including species many times their own size, in a real mutual grooming relationship seen on the reef.
No clear seasonal pattern shows up in sighting data, and with a comfortable range of 24.5 to 28C, Florida's reefs stay within that window most of the year, so it's a fair bet on any dive.
Reef neighbours a diver could mistake it for. Use the identification notes above to tell them apart.
This one is essentially a Florida speciality among logged dive sites, with sightings concentrated on reefs throughout Florida, USA. If you're diving the Florida Keys or nearby reef systems, keep your eyes on coral heads and ledges at close range rather than scanning open water.
Mapping where Neon Goby is logged…
Florida, USA is by far the strongest region for logged sightings, with reefs there accounting for nearly all recorded encounters. Look for it on coral heads and ledges rather than in open water.
There's no strong seasonal signal in the data, and its temperature niche of 24.5 to 28C matches Florida reef conditions for most of the year, so it's a reasonable year-round sighting.
Look for a tiny, roughly 4cm fish with a bold electric-blue stripe running the length of a dark black or navy body. It stays still on coral or sponge rather than swimming freely, which makes the stripe easy to spot once you know to look close to the reef surface.
They stay small, topping out around 4cm, making them one of the tinier reef fish divers deliberately look for rather than notice by accident.
It runs cleaning stations on the reef, where larger fish line up to have parasites and dead skin picked off by the goby, a real cooperative relationship you can watch play out in real time.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Slender Goby
803 sites
