Author: Martin & Wainwright, 2013
Comments: Inhabits six hypersaline lakes (Crescent Pond, Osprey Lake, Oyster Lake, Little Lake, Mermaid Pond and Great Lake).  Sympatric with <i>Cyprinodon variegatus</i> in all six lakes and with <i>C. brontotheroides</i> in four of the six lakes (except Great Lake and Mermaid Pond).  These lakes are shallow, rarely exceeding 3 m depth, and densities of <i>Cyprinodon</i>	 are greatest in mats of macroalgae (<i>Batophora</i>, <i>Acetabularia</i> and <i>Cladophora</i>) and wigeongrass (<i>Ruppia maritima</i>) along the littoral margins of each lake.  Feeds on  scales of other fishes.  Spawning occurs in spring and summer seasons, but it seems to be more common in the summer. Breeding territories are guarded by males (Ref. 94405).