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BiologyThere appears to be two genetically distinct forms (Ref. 27547), an inland form found in sandy and rocky shores of lakes, and a coastal form usually found over sand in quiet runs of small to medium rivers; sometimes in salt water near river mouths (Ref. 2850). The coastal form moves into brackish estuaries to spawn (Ref. 27547). Oviparous with demersal, adhesive eggs and pelagic larvae (Ref. 265). Feed mainly on aquatic insect larvae and bottom invertebrates (Ref. 1998). Too small to be used as food and too difficult to capture in large numbers to be used for anything else (Ref. 27547) but large individuals are reported to be excellent eating as well as good bait fishes (Ref. 2850).