Oh, but it is a problem on land too. For example, the American bison was exploited til near extinction with only a few hundred individuals left in the mid-1880s. http://en.wikipedia.org/wiki/American_Bison The passenger pigeon was not as lucky to escape extinction. http://en.wikipedia.org/wiki/Passenger_Pigeon
Overexploitation in the ocean is currently more of a problem than overexploitation on land in the US, but not necessarily so in other parts of the world. There are many primate species in Africa that are being overhunted, especially to be sold in the bush meat market. It could be argued that we (the US) move to the ocean because we have already overexploited almost everything possible on land.
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