The japanese have been living off the ocean for as long as they have existed, how ever with technilogical advances in the commercial fishing industry, its has become much more efficent, maybe even too efficent. this efficency translates into many more fish and ocean mammals being caught and mother nature can't keep up with the demand, hence the decline of some of the worlds most precious creatures.
And yes dolphin do eat tuna, tuna are not born weighting two hundred pound they start off as fry just like all fish, and have to survive the gauntlet just like all fish even sharks are eaten by other fish when they are small. The basic principle in the ocean is if a fish will fit in another fishes mouth it will be eaten.
As an avid fisherman i have seen first hand the damage the commercial fishing industry has had on the oceans, i've seen the thousand of dead fish floating in the ocean that where too small for them to keep, or as its called in that lexicon "by catch". Every year fishing becomes worse yet quotas go up. If you want to carry that concern to other ocean creatures consider the blight of the Bluefin tuna, the mako shark, and the sword fish , even the marlins, These creatures especially the tuna and sword fish have been over fished for years especially by the japanese, and there numbers are being desimated as we speak. and with this new fad of sushi eating growing every year because celebrities eat it, the presure will only increase, so if you are concerned about the worlds oceans try not to eat wild caught fish that are known to be in low numbers, for as long as we keep eating it the more they will keep catching it.
However the video was very disturbing and not something that i enjoyed watching, perhaps if the animals where not killed in such a horrible way it would not be as bad. I do hope that something is done about it. But I will not sign the petition Jauquin Phoenix is a known PETA spokes person and i would imagine that Peta put the video out there. And I will not in any way, shape, or form support PETA, or anyother group out there like them, because in their eyes we are all guilty of animal cruelity. Whether you like it or not.
P.S. This post is meant in any way to start an arguement, just my opinion and experiences.
Mike