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Discover reports on the decline of a fish called menhaden, one of the most important links in the food chain. Menhaden are used as high protein feed for chicken, cattle and hogs. Many larger fish consumed by humans feed on menhaden. The decline in their numbers is cause for alarm. Not only is the food chain suffering, but the algae and detritus which menhaden feed on now clogs inland waters. "Since market forces are unlikely to curtain the menhaden fishery, governments may have to take action," Discover reports.

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