Evaluation of Blue Tilapia (Oreochromis aureus) for Duckweed (Lemna minor) Control in South Carolina's Private Waters
نویسندگان
چکیده
We evaluated the consumption of duckweed (Lemna minor, Linnaeus) by juvenile Blue Tilapia (Oreochromis aureus, Steindachner) through 48 hour indoor tank feeding trials. Feeding trials consisted of 5 tanks (4 treatment, 1 control). Tanks were stocked with 25 g of fresh duckweed at the initiation of each feeding trial. Designated treatment tanks were also stocked with 1 tilapia per tank. At the end of each 48 hour feeding trial remaining duckweed was collected, hand pressed, towel dried, and weighed. Feeding trials were replicated 5 times. Duckweed biomass in control tanks remained constant throughout trials (α = 0.05: p = 1.000). Biomass decreased in tanks stocked with tilapia (α = 0.05: p < 0.0001). Mean change in duckweed biomass for tanks stocked with tilapia was -8.15 g (SD = 1.69 g). Observed feeding rates in this study indicate juvenile Blue Tilapia consumed approximately 36 – 86% of their body weight in duckweed every 24 hours (m = 58%, SD = 12.19%). Introduction Aquatic plants frequently create problems for farming operations utilizing pond water for irrigation. Free floating aquatic plants commonly clog irrigation pumps, plumbing, and emitters. Disruption of normal water flow in irrigation systems can be time
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