Which best describes potassium salt of endothall?

The potassium salt of endothall is best described by its low toxicity to fish. This characteristic is essential for its use in aquatic environments where fish populations are present. Pesticides used in aquatic systems must have low toxicity to non-target species, particularly in efforts to manage invasive plants without harming beneficial aquatic life. The low fish toxicity of the potassium salt formulation allows for safer application in water bodies, minimizing the risk of harming fish while still effectively controlling the target aquatic weeds.

In aquatic weed management, the ecological impact is a critical consideration, and the formulation's safety profile plays a vital role in determining its usage. Other formulations might be designed for specific targets, exhibit systemic properties, or function by inhibiting certain enzymes, but the emphasis on low toxicity to fish sets the potassium salt of endothall apart as a suitable option for integrated pest management strategies in aquatic systems.