The Retroculus septentrionalis lives in the benthopelagic, freshwater environment.
Retroculus septentrionalis juvenile in the aquarium of Fabien NANEIX . Photo by Fabien Naneix. Retroculus septentrionalis Gosse, 1971 - Curator: Lee Newman. Last updated on 07-Nov-2009. More
Retroculus septentrionalis: Dorsal fin XIV-XV.10-11. A. III.6-7. Scales in a lateral row 34-37. Gill rakers 13-15. Caudal fin with distinct vertical stripes. More
I was suprised to find Retroculus septentrionalis in such slow water habitats. With its spear-like teeth, it's easy to see why Hydrolycus cf. armatus is a top predator. More
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