Cobalt Blue Goby Care Guide
Stiphodon semoni · Freshwater Fish
What Cobalt Blue Goby look like
The Cobalt Blue Goby (Stiphodon semoni) is a diminutive, laterally compressed fish, reaching a maximum adult size of approximately 1.5 inches (3.8 cm). Sexual dimorphism is pronounced; males exhibit a striking, vivid cobalt blue coloration that can appear almost luminescent, particularly during breeding displays, while females are characterized by a more subdued olive-brown hue adorned with dark vertical bars. Males also display distinctive red-orange tips on their dorsal fins, enhancing their visual appeal. A notable morphological adaptation is the fusion of the pelvic fins, which forms a specialized suction cup that allows the fish to cling securely to rocky substrates in their natural habitat. This species lacks a swim bladder, which contributes to its benthic lifestyle, and features a well-developed lateral line system for detecting water movements.
Behavior & temperament
Stiphodon semoni is primarily a benthic species, often found clinging to substrates in shallow freshwater streams and rivers. They exhibit a social hierarchy, with males establishing territories and engaging in displays to attract females, particularly during the breeding season. This species is not an obligate schooler; however, they can often be observed in small groups. Breeding behavior involves egg scattering, where females deposit eggs in crevices or on the undersides of rocks, which males then fertilize. The temperament of the Cobalt Blue Goby is generally peaceful, though males can exhibit territorial aggression towards one another during the breeding season.
Diet & feeding
In the wild, the Cobalt Blue Goby primarily feeds on algae and detritus, making it an obligate herbivore. In captivity, they require a diet rich in spirulina and other high-quality herbivorous foods to thrive.
Behind the name
The genus name 'Stiphodon' is derived from the Greek 'stiphē' meaning 'to cling' and 'odon' meaning 'tooth', referring to the fish's ability to adhere to surfaces with its fused pelvic fins. The species name 'semoni' honors the French naturalist, Paul Semon.
Plan your tank
Check the numbers before you buy: tank volume, a stocking plan, cycle progress, water changes, and your ongoing care routine.
Keeping Cobalt Blue Goby?
AquaLens identifies your fish and plants from a photo, tracks water chemistry, and flags health issues early — free on iOS and Android.
