Yes. I fished with a net and I know what it's like. As I said earlier, when the mackerel is too big for the nets, it drowns. It suffocates. Then it falls to the bottom and isn't counted. These are also mackerel with gonads and eggs, so they are fish that spawn.
Everyone can fish with a line. If given a long enough period, fishers from almost everywhere will be able to catch mackerel, especially if they wait until September or October, when the mackerel is fattier and better suited for human consumption and bait.
In my opinion, commercial fishers should have a weekly quota and be able to sell mackerel to the coastal community, because we were born eating mackerel. It's the same thing for herring and cod.