British Wildlife 15.2 December 2003

Sunbleak and Topmouth Gudgeon – two new additions to Britain’s freshwater fishes

Throughout the world, it is commonly accepted that the introduction of new species to a stable ecosystem can upset the environment and the species already present. Aquatic ecosystems are no exception and, with a dramatic increase in world travel and trading over the last century, are increasingly at risk from biological invasion. 

Through a naturalist’s eyes
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