Tern, a very interesting bird, and I am sorry that circumstances are not in her favor. Regarding the lack of fish, I hope that this is a temporary phenomenon. Climate change, changing the Gulf Stream, but, fish, they are able to adapt to new conditions. I often read articles that talk about the risks of complete extinction of those or other fish. But, fish, this is not a robot, which is programmed in a narrow range of actions. I devoted many years to aquarism and many times I had to transfer fish from one condition to another habitat. I raised or lowered the temperature of the water. Increased or lowered the acidity of water, and this, in a small, confined space. The ocean is large, there is plenty of dissolved oxygen in it, it takes time for the heated water to be saturated with this oxygen, the fish will acclimatize. It is the reduction of dissolved oxygen, with an increase in the temperature of the water, that leads to the stress of the fish, who are accustomed to a higher oxygen content. Thank you, my Dear friend @Siggjo, for an interesting plot! Good night to you!