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Pastimes : I Love to Fish

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From: Snowshoe	4/28/2011 4:25:17 PM
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Fish Can Detect Marine ‘Dead Zones’ newswise.com Otoliths are small, calcified structures that form part of a fish’s hearing and balance system. They grow by depositing increments every day, creating a chronological record of fish age and growth. The trace elements and isotopes taken up by otoliths also reflect conditions in the fish’s environment. Otoliths, therefore, create a sort of life story for each individual fish, telling the tale of how it lived its life, how long it was exposed to hypoxia (or not), how long it resided as a juvenile in a nursery habitat, and when and where it migrated to offshore, deeper waters.

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