Redear sunfish generate from springtime to very early autumn. The men build nests in silt, sand, or soft mud. These nests are constructed together in nests in shielded, superficial areas near the coast. The girls transfer the eggs which hatch within two to four days. These eggs are safeguarded by the males for several days. The young feed on zooplankton.
As bottom fish, their favored meals is snails, however they additionally eat various other shelled creatures. Their thick, difficult teeth permit them to squash the skeletons of shelled pets. These teeth go to the rear of their mouths, and also enable them to operate like a nutcracker by crushing the shells of snails, hence the nickname, "shellcracker". They can also open up small clams. They will certainly likewise consume larvae, fish eggs, and crayfish. Since of its specialized food niche, Redear sunfish could reside in lakes without competing for the very same meals of fish that like area eating. And also considering that snails could spread out condition, as well as since snails are among Redear's favorite foods, these fish are used in lake administration tasks to manage snails.