Fishermen recently netted 100,000 pounds of nutrient-laden gizzard shad from Lake Apopka in one week. The St. Johns River Water Management District funds the harvest as part of a multifaceted approach to restoring water quality and improving habitat for desirable game fish.
Large numbers of gizzard shad may contribute to nutrient recycling by stirring up bottom sediments during feeding. Removing large numbers of undesirable fish from a waterbody also removes the nutrients in their bodies, which helps improve water quality.
It’s expected that 1 million pounds of undesirable fish, mostly gizzard shad, along with some tilapia, gar and invasive armored catfish, will be harvested during the season, which began in late October and runs through the beginning of 2018. For every 1 million pounds of fish caught, about eight thousand pounds of phosphorus are removed. The district pays $0.58 per pound to harvest, process and transport the inedible fish, which are eventually used as bait for crayfish and crabs. Last season, about 985,000 pounds were removed from Lake Apopka.
The fish harvest had been previously used at Lake Griffin. In combination with other nutrient removal projects and technologies, the work was successful enough that water clarity improved, and submerged aquatic vegetation and game fish returned.