By analysing their stomach contents and faeces, and multiplying the results by the number of grey seals in Norway, researchers estimated that they consume 8,000 tonnes of fish per year. Saithe, cod and wolffish were their favourite foods.
In the North Atlantic there are several hundred thousand baleen whales that migrate long distances, whereas in the North Pacific there are just a few hundred of them. That is the conclusion of a new study.
In much the same way as humans, mackerel need their own personal space too. Crowding the mackerel during the catch process might have significant consequences when those mackerel end up on our dinner plate.
Field experiments show that seismic activity does not harm this important species of zooplankton: not at all when the air guns are over ten metres away, and with a maximum of 30% higher mortality than controls even in close proximity.