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(marine biology) An underwater anoxic event, especially one that causes a crash in fish populations / Used other than figuratively or idiomatically: see fish, kill.

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fish kill

After the prolonged algal bloom, scientists documented a severe fish kill along the estuary that wiped out large schools of bottom-dwelling species.

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After the prolonged algal bloom, scientists documented a severe fish kill along the estuary that wiped out large schools of bottom-dwelling species.

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