Life in the oceans will not die out. The water will have a green tinge. Little known among the populace, but well known among scientists, is that the ocean is one of
the largest producers of the atmospheric oxygen. After the cataclysms, the atmosphere oxygen will be rebuilt from the oceans. The oceans will appear greenish to
many, and for good reason. All the fires will have placed a tremendous amount of carbon dioxide into the air, the stuff of which vegetative grown is made of. With
little vegetation on land, the ocean kelp will absorb and utilize this. The oceans will be lush.
Even those far inland should plan to take advantage of the lushness of the oceans, the fish and kelp, to support humans survivors. This will not be so dependent upon the air clearning, as the oceans move this food about, fish about, so fishing anywhere will be more abundant, compared to land life, in the Aftertime. Life in large lakes, as well as oceans, will fare far better than land based life after the shift. This is in part due to the way sunlight enters water, and the susceptibility of land based vegetation to mold and bugs and physical assult and the like. Seaweed will not find more assults than before, but will find more nutrients. Where the sunlight may be less, they can parlay any growth upwards, using all sunlight, where land based vegetation finds itself decimated periodically, having to start over, etc. Thus, ocean fishing will be best, due to the broad space it covers and the shared nutrient and fishlife resulting, but land lakes will likewise likely do better than the shores!