There is a huge problem. If there is no healthy place for the fish to exist there is no place for them to come back from. One river being polluted can be cured when other waterways exist to restock the river once cleaned up. But what is happening is a holocaust of near 100% efficiency. Before 1492 we had unimaginable fish stocks in the N. Atlantic. Now we have far less than 1% of what we had back then.