Biotic, Fish have white spots caused by parasites., Fish are infected by bacteria., Fish have cotton-like growth on their skin caused by fungi., New fish carrying viruses are added to the pond without quarantine., Tiny worms attach to the fish and suck their blood., Abiotic, Fishpond has dirty water., Factory waste enters the pond., Pond has very little oxygen., The water becomes too hot because of very hot weather, Farm chemicals are washed into the pond after heavy rain., Too much fish food is left in the pond, making the water dirty.

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