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Speaker 1: All across the state. Dog walkers and joggers.

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Speaker 2: Are reporting dead fish washing up at Cranberry bogs, ponds

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Speaker 2: and small lakes, So what's going on here.

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Speaker 3: Fishkills are when there's a mass die off in a

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Speaker 3: water body, could be a lake or a pond, rarely

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Speaker 3: a stream or a river, and they're caused by multiple

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Speaker 3: factors and they can occur year round.

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Speaker 2: Jason Stillarski and aquatic biologists with Mass Wildlife says winter

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Speaker 2: fish kills are a part of the natural ecosystem when

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Speaker 2: not enough plants produce less than suitable oxygen for fish

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Speaker 2: to breathe through their gills.

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Speaker 3: And lakes and ponds, fish gets stressed at five parts

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Speaker 3: milligrams per liter below that, and then anoxy occurs below that,

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Speaker 3: which means there's zero oxygen or less than one milligram

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Speaker 3: per leader, and at that point fish die.

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Speaker 2: If you happen upon a pile of fish on the shoreline,

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Speaker 2: the state still urges you to call it in so

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Speaker 2: an expert can come check it out. In Westboro, Jay

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Speaker 2: Will at WBZ, Boston's news radio