The amount of fish in the sea declines only where there is overfishing.
The top 1% in this country has increased its percentage of the national wealth by a lot in the last 20 years. Most of the increases in productivity have gone into their ample pockets. They are, in your analogy, teeming with fat, large fish. Raising their taxes by 5% on the bracket over $1 million would simply provide the taxes needed to improve the infrastructure and offset the interest on the national debt. This will benefit nearly all of us.
If these uberrich actually were job creators, they have not done their job by creating more jobs. They have failed to prove that their allegations about how useful they are.
Rather than codfish, think of them as stone crabs, haul them in snap off their large claw and throw them back to grow another.