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BiologyGregarious but occurs in more restricted schools of about a dozen individuals. May occur singly or as a couple (Ref. 35237). Mainly found in freshwater (Ref. 9589) and brackish estuaries near river mouths (Ref. 5217). Occasionally marketed in the aquarium trade (Ref. 9589). Used in eye research because of its divided cornea which projects two images on the retina (Ref. 35237).