Does homeowners cover loss of fish in stocked pond?

That would be highly unlikely. Unless you specified on your policy you have a stocked pond and want to insure your fish and the pond I doubt they would even underwrite that in an insurance policy.

Best thing to do is to check with your agent about various scenariOS and see what is covered.

For example - floods, hurricanes, tornado's, sink holes are usually not covered unless you request an add on to your current policy. As well as items such as Guns and Jewelry are also not even covered and must be included in a attachment type policy through your home owners insurance.