I do think we are over fishing the resources. The Somolia pirates started out to defend their waters from foriegn fishing boats. Japan raided the Gulf of Baja. The other aspect is enviromental. To much polution going into the water. PBS did a documentary on the Chesepeke bay. A lot of nitrogens going into the water. A lot of political clout from chicken producers that shirk their responsibilities. We also see this in the Geat Lakes and Gulf of Mexico. THere is a lot of fertilizer run off, especially from cornfields. There is some progress being made.
I can remember in the late 80's that a farmer near the Letort in Carlise PA hauled out a container or pig fertilizer. The wagon got stuck in the mud. So the farmer dumped the fertilizer. Then the farmer went back and filled up again, to get stuck again and dump the fertilizer. This killed off a lot of trout in the Letort. If you look at the satistics 60% of water polution is agracultural based. Also, there is a growing concern about hormone levels in the water supply. The estrogen from birth control pills might be affecting the gender basis in the fish population.
Tom