Abstract

Abstract Swim-up Florida largemouth bass (Micropterus salmoides floridanus) were held in 1 L of water with the following combinations of zooplankton: 400 mixed cladocerans, 0 Cyclops vernalis; 200 mixed cladocerans, 200 C. vernalis; and 0 cladocerans, 400 C. vernalis. After 24 h, mean survival percentages for Florida largemouth bass were 97, 27, and 7%, respectively. Larval fountain darters (Etheostoma fonticola) were tested similarly; after 24 h, 100% of the fish combined with cladocerans only were alive, but no larvae survived either treatment containing C. vernalis.

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