As bottom fish, their favorite food is snails, but they likewise eat other shelled animals. Their thick, hard teeth allow them to squash the skeletons of shelled animals. These teeth are at the rear of their mouths, and also permit them to operate like a nutcracker by crushing the coverings of snails, thus the label, "shellcracker". They could also open up tiny clams. They will certainly likewise consume larvae, fish eggs, and crayfish. Due to its specific food particular niche, Redear sunfish can live in lakes without contending for the same meals of fish that choose area feeding. And also because snails can spread disease, as well as since snails are just one of Redear's favorite foods, these fish are utilized in lake administration tasks to manage snails.
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Redear sunfish generate from spring to very early fall. The males build nests in silt, sand, or soft mud. These nests are built with each other in colonies in safeguarded, superficial areas near the shore. The women transfer the eggs which hatch out within 2 to four days. These eggs are guarded by the men for numerous days. The youthful live on zooplankton.