This species inhabits shallow (about 20 cm depth), fast-flowing waters with a substrate composed of sand and gravel. They sometimes dwell along the muddy riverbanks, hiding under woody debris .
Dorsal soft rays (total): 5; Anal soft rays: 6 - 8. : elongated.
Behavioural data for Ernstichthys Casalinuovoi is currently being reviewed.
Diet information for Ernstichthys Casalinuovoi is currently being compiled.
Reproduction data for Ernstichthys Casalinuovoi is currently being compiled.
Freshwater; demersal. Subtropical South America: Argentina.
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