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Fish and other aquatic biota may be harmed by
pesticide-contaminated water.Pesticide surface runoff into rivers
and streams can be highly lethal to aquatic life, sometimes killing
all the fish in a particular stream.Application of herbicides to
bodies of water can cause fish kills when the dead plants rot and
use up the water's oxygen, suffocating the fish.Some herbicides,
such as copper sulfite, that are applied to water to kill plants
are toxic to fish and other water animals at concentrations similar
to those used to kill the plants. 35] Repeated exposure to
sublethal doses of some pesticides can cause physiological and
behavioral changes in fish that reduce populations, such as
abandonment of nests and broods, decreased immunity to disease, and
increased failure to avoid predators.
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