Abstract
AbstractIn an experimental Fundulus grundis hatch and growout system at the Cedar Bayou Mariculture Laboratory, egg‐to‐harvested‐fry survival rate of F. grundis was inversely related to percentage of Cyprinodon variegatus fry present (P < 0.05). Competition for food and space was noted in growout ponds, and high mortalities of F. grundis fry and adults occurred in mixed holding containers as a result of the agonistic behavior of C. variegutus. The hardiness and aggressiveness of the sheepshead minnow, its ability to enter water supplies as small prolarvae, its early sexual maturity, and rapid increase in ponds make it a significant pest in mariculture.Control measures for C. variegutus include screening incoming water; hand‐sorting contaminated broodstock and fry; and draining, drying, and refilling infested ponds to allow drought‐resistant eggs to hatch, then draining and drying again.
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