It is getting so bad that fish cans have warning on them not to eat certain types of fish more than once a week.

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The more good worms and less bad ones your fish eats, the more points you get.

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Yet farmed fish still carries a bad rap, both from environmentalists concerned about the pollution caused by on-shore and near-shore farms, and from food snobs who favor the more robust taste of wild caught fish.

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When discharged into waterways, they cause excessive growth of algae, which can smell bad and which robs the water of oxygen that fish need to survive.

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The global figure for stocks of fish that are endangered or in a very bad shape is 20%, according to Frans Muller, chief executive of German supermarket group Metro, which he says is "by far the largest seller of fish in Europe".

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And even though they have some good prospects coming, just the entire tenor, it leaves a bad taste in your mouth, as anyone who has tried to eat an aggressive game fish can tell you.

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