The Signal Goby: A Master Mimic with a Sketchy Captive Survival Record

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Signal goby (Signigobius biocellatus)

The signal goby (Signigobius biocellatus), aka the twin-spot, two-spot, or crab-eye goby, is an appealing little sand sifter with fascinating behavior that, unfortunately, often adapts very poorly to aquarium life. Nonetheless, specimens still appear in the aquarium trade, so it’s worth discussing the species here—if only to understand why it’s probably best to pass it by if you should happen to come across one at your LFS.

Physical traits: S. biocellatus has a torpedo-like body shape, high-set, bulbous eyes, a comically frowning mouth, and two prominent dorsal fins. In coloration, it’s grayish overall with orange-brown mottling. Each dorsal fin features a large, distinct eyespot, and the pelvic and anal fins are black with blue dots. The maximum size of this goby is around 4 inches.

A crabby mimic: When you view this fish in profile as it hovers just above the substrate, the twin eyespots create the impression that you’re looking at a crab scuttling sideways along the ocean floor, which might give would-be predators pause. MORE

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Saltwater Smarts is a unique online resource created by long-time aquarists Chris Aldrich and Jeff Kurtz to inspire and entertain a new generation of marine aquarium hobbyists while helping them acquire the reliable, authoritative knowledge base they need to succeed with a saltwater system. By clarifying key concepts, techniques, and terminology, as well as sharing expert insights from fellow enthusiasts and industry professionals, Chris and Jeff hope to promote a more accessible, sustainable, and enjoyable marine aquarium hobby. Read more about our mission and the contributors who are part of our team.

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