Let's take a look at a leading scientist who does not blame global warming for the decline in fish populations off the east coast. The reduction in fish population is due to overfishing, the destruction of coastal habitat, and pollution.
The Tar Heel of the Week is Doug Rader, the Raleigh-based chief oceans scientist for the Environmental Defense Fund. He is considered one of the top fisheries expert in the U.S, and has been very active in working on cooperative solutions between fisherman, government, and others to preserve the oceans. This week's N&O article about Doug is here -
http://www.newsobserver.com/2015/01/03/4447100_tar-heel-of-the-week-doug-rader.html?sp=/99/100/&rh=1
Also - he has stated that AGW has an insignificant role with the problems we have fishery issues globally. The problems are due primarily to overfishing, the destruction of coastal wetlands, and pollution - as outlined in the article.