Why did your goldfish die during a thunder and lighting storm?

Answer 1

because thunder is attrackted to water so the electric shock would of killed the fish.

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I've been doing some research on this, because my goldfish went belly up in recent storm. here's what I found:

"Short-term increases of nitrate may also be formed, in a pond or other body of water, during a thunderstorm because the electrical discharges of nitrogen in the air, created by the rain, rinse into the pond.

During nitrification acid is formed. This lowers the pH value of the water. Since the buffering capacity of the water is lowered the risk of acidification of the pond increases. In the nitrification oxygen is consumed. This has an impact on the oxygen of the water."

Fish need oxygen, so perhaps we could deduce that the impact of this would kill them?

Answer 2

Goldfish can be sensitive to sudden changes in environment and stress, which can be triggered by loud noises and changes in air pressure during a thunder and lightning storm. The stress from the storm may have caused your goldfish to become agitated and unable to cope, leading to its death.