Abstract

AbstractEnvironmentally derived “off‐flavors” such as “earthy” and “musty” in cultured channel catfish Ictalurus punctatus are attributed to the presence of certain species of cyanobacteria (blue‐green algae) in ponds. The musty off‐flavor is caused by absorption of the metabolite 2‐methylisoborneol (MIB) into channel catfish flesh. Most channel catfish producers manage off‐flavor episodes by the application of algicides; however, these algicides have high environmental persistence and broad‐spectrum toxicity. Recent research has discovered several natural and natural‐based quinones that are effective and selective in reducing the abundance of the MIB‐producing cyanobacterium Planktothrix perornata. In this study, efficacy testing of one of these quinones, anthraquinone‐59, in a channel catfish pond found that it is effective in reducing the abundance of P. perornata and subsequently lowering the MIB levels in channel catfish.

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