To preserve and increase fish stocks, certain fishing rules have been established. Explain why finely-meshed nets and fishing

To preserve and increase fish stocks, certain fishing rules have been established. Explain why finely-meshed nets and fishing techniques such as pickling or killing fish with explosives cannot be used when fishing.

1) When using fine-mesh networks, a lot of not grown fish is caught, which could give large offspring;
2) etching or jamming with explosives – predatory fishing methods in which many fish die uselessly,
3) in addition to fish, other living organisms die.