This is like downing a six pack and eating a pound of bacon and a gallon of ice cream every day, then blaming your heart attack on the sugar in your breath mints. See the chart in the first link below for the percentage of greenhouse gases contributed by different sectors of human activity. Next the chart in the second link on the number of (US) households actually keeping fish and extrapolate this to some sort of estimate for a world average-- in a few countries higher, possibly, in most undoubtedly lower than the US. Then, for that small percentage of households, guestimate an average percentage of total household energy use for fish vs. lights, appliances, heat and air conditioning, television (and computer, hair dryers, power tools, charging devices, etc.), charging an electric car if there is one, and whatever else you have...
Sources of Greenhouse Gas Emissions | US EPA
Pet Ownership Statistics [2022]: U.S Pet Population (spots.com)
Sources of Greenhouse Gas Emissions | US EPA
Pet Ownership Statistics [2022]: U.S Pet Population (spots.com)
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