I was appalled at some of the stories the old fishermen told, shoveling "Ping pongs" over the side by the ton. A ping pong is a small haddock; too small to be marketable.
In those days they could use any kind of nets they wanted to, and the undersize fish could not escape through a one inch opening.
In 1950 an international treaty was signed that no longer allowed boats to take Haddock and Cod with a net that had openings of less than 4 inches. That allowed the pin pongs to escape and not be brought to the surface where they would die anyway from the difference in pressure.

Commercial fishermen are some of the greediest people in the world. Each one of them wants to be the guy who caught the last fish.