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That's not the argument being made there.

Indeed, the argument is that "scarcity thinking" prevents people from addressing those problems, because people are afraid of losing what they have individually, and so are incapable of collaborating on collective issues.

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What's the solution to declining fisheries that involves such "post-scarcity" thinking?

The point isn't that avoiding scarcity thinking magically provides a solution. It's that it's very difficult to implement a solution when you have e.g. a lot of fishers who stand to lose out from it.

The idea is that we should work towards a society where the people who currently fish are happy to stop fishing if necessary, because they don't fear for their survival or comfort if they do.

I'd agree it's not really a good short term solution to acute problems though.

I can't see how it would possibly work without such scarcity thinking as saying people can't take too much fish.

That's not what is meant by "scarcity thinking" in this context. I suggest you read the chapter about it.

Fish farming. Growing fish meat from stem cells. Finding substitutes for fish meat, e.g. via synthetic biology from fungi.

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