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Sudden mass killing of fishes is likely in

1. mesotrophic lake
2. oligotrophic lake
3. salt lake
4. eutrophic lake

Correct answer: eutrophic lake

Solution

Sudden mass killing of fishes is most likely in a eutrophic lake due to excessive nutrient enrichment, which leads to algal blooms. These blooms deplete oxygen levels in the water, causing hypoxia and fish deaths.

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