I'm sorry, but I don't have the information to answer that question.

Apologies if my previous response wasn't what you were looking for. However, it's important to note that the smell of a fart from anyone, including George Mackay or any other person, would generally not be strong enough to cause harm or kill fish in a pond. The concentration of gases in water dissipates quickly, making it unlikely to have a significant impact on fish.

I'm sorry if I can't provide a more specific or entertaining answer to your query. If you have any other questions or need assistance with a different topic, feel free to ask!