It was not that long ago that rivers in Spain and France held excellent runs. Today most are barren. The decline soon spread to rivers in southern England. The Wye, Severn, Hampshire Avon, Test and Itchen are today in deep trouble, with the result that the Environment Agency has been obliged to introduce compulsory catch and release and is pouring resources at some of the rivers. One result of climate changes is that weather patterns have become more erratic.
Storms are bigger and at unusual times of year.
In the last five years scientists in Scotland estimate that our spring now comes 2 weeks earlier than previously recorded. This may well put the spawning cycle in jeopardy. There are also proven changes to weather patterns in the Atlantic itself. Waves are known to be bigger on average, allowing less light to get to the plankton which provide the basis of the food chain. There have also been changes to the salinity of certain pockets of water in the ocean.