ANSWERS: 5
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If the water is treated like an aquarium, then yes a fish can live in a swimming pool. In Niagara Falls Ontario, there is a park devoted to displaying fish in swimming pool sized aquaria and many city Zoo's will feature a dolphin pond of some sort. If the question is, "can I drop my fish into the deep end of the family pool this afternoon and have him live there." then the answer is no. The water conditions that we typically use to maintain a clean swimming pool are toxic. People have a tendency to add way too much chlorine.
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We use chlorine in swimming pools to prevent unwanted bacteria and plants from growning. The chlorine combines with hydrogen to form a weak concentration of hydrochloric acid. Fish don't like hydrochloric acid. It kills them. Even our tapwater we drink has small concentrations of chlorine and other gases that will kill fish. That is why when tapwater is used to fill a fish tank, one must treat the water with a couple drops of solution that will remove the chlorine from the water.
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I have a salt water pool with a PH of 7.6. During the summer holidays my family and I thought it would be entertaining to introduce a fish or two for the kids to chase etc. After consulting my local aquarium shop, I purchased 25 "Mollies" (a common eurohaline species). I introduced them to my pool that afternoon! And believe it or not they survived until autumn! So yes, fish can survive in a pool providing you talk to a local aquarium store and buy the right species.
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Only the floating plastic type.
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Not in chlorinated opools. Maybe in saltwater ones, with pond weed to protect them from predators.
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