I cange the water in the tank and the fish is jumping out and dieing what can i do?

Answers:
Change no mare then 25% of the water at a time or you can stress the beneficial bacteria population causing a spike in the amount of ammonia, nitrites and nitrates in your tank. You also need to make sure the new water is at a similar temperature of the tank. If the water has been sitting still for a while it will be low in oxygen. Run an air stone in the new water for an hour before adding it to the tank.
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Maybe the water temp is wrong - too hot, too cold? The water that you replace must be within 1 degree of the remaining water in the tank.
Did you treat the water to remove the clorine and chloramine from the water? Did you add anything else you should not have?

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never change more than 25% of the water per week. you have removed all of the beneficial bacteria that makes the water safe (breaks down the toxic ammonia into less toxic substances). always use a water conditioner (dechlorinizer) and add a bacteria culture after the dechlorinizer is used.

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Its the temperature. Use room temp. spring water and then you don't have to treat it. I did this and my fish lived 4 years.

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check your temp and nitrate and nitrite

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You need water to be room temperature before placing the fish. Also, try lowering the water level to make it harder for them to jump out.

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Put a lid on it with a small hole in the middle.

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is it too hot,too cold

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Do you do any kind of water testing to see if all the elements are correct? You can take a water sample to any pet store and they will do it. get a book on how to take care of fish before you buy any more

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maybe they are just shocked and sometimes fishes do jump out if they think your're gonna catch them. only take small amounts of water out at a time, and then catch the fish quickly with a big net. then after, get a lid.

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Are you useing Dechlor/Ammonia binder and are you testing the water? This would be the number one thing to check! If your not useing ammonia binder/dechlor, then get some Prime! City water sources often have Chlorine or Chloranine in them and they are deadly to fish.

Fish often jump if the water is bad. The second cause would be from parasites.