This affected the aquatic plants and fish (only a few fish species remained).

But this is the first evidence that suggests ocean acidification could also affect fish directly.

Reservoirs of disease are clinically affected fish and recovered covert carriers.

This increase in hormones in the water has affected waterways and nearby wild fish.

PCBs in the river sediment also affect fish and wildlife.

These are also quicker acting but can affect predaceous insects, arthropods and even fish.

They can be toxic to other animals, affecting particularly microorganism and fish.

Some of these diseases affect commercially important fish and can therefore indirectly impact human health through their consumption.

In theory, the sludge dumped at the new, 130-mile-square site should quickly become so diluted that the contaminants cannot affect fish.

He has also chaired investigations into diseases affecting farmed fish.