I just found this rather interesting article which points out a different reason for the change in fish, water mammal and bird behavior.
"The world's oceans are sacrificing themselves to try to stave off global warming, a major international research programme has discovered.
Their waters have absorbed about half of the carbon dioxide emitted by human activities over the past two centuries, the 15-year study has found.
Without this moderating effect, climate change would have been much more rapid and severe."
"The new study warns of an even more alarming collapse throughout the world's oceans if climate change continues. It is the result of a mammoth
research effort, which has taken and analysed 72,000 samples of seawater from 10,000 different places in the oceans since 1989.
Led by scientists working for the US National Oceanic and Atmospheric Administration in Seattle, it has also involved teams of researchers from
Australia, Canada, Spain, Japan, South Korea and Germany.
It has discovered, for the first time, that the seas and oceans have soaked up almost half of all human emissions of carbon dioxide, the main cause of
global warming, since the start of the Industrial Revolution."
news.independent.co.uk...