You should be able to buy prducts for any pet shop called something like 'Fungi cure' or 'Multi cure'
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Goldfish do not get pregnant. They are egg layers. Black spots on goldfish have nothing to do with their breeding condition.
If the fish is a Goldfish you check to see if the spots are only on the fishes gills and pectoral fins. If so the white spots are indicating that the fish is in breeding condition. If the white spots are visible on other parts of the fish then your fish probably has Ich/Ick/ Whitespot and you will have to use a commercially available cure normally available at the pet shop.
Strangely, scientists have proved that it does cure spots!
The black spots on a roosters comb could be several things. The black spots could be mite bites or just scabs from being pecked by other roosters. One treatment that can be used is the Vaseline treatment.
The Betta fish may have a fungus disease if there are small black spots on the back. It could also just be aging spots that some Betta fish get. You can purchase BettaFix at any pet store and add it to water to see if that helps.
It's regalar to have that on a gold fish
It is a form of cancer. It isn't really known how fish get it.
I have sun spots, can others get them if they wear my clothes?
the cheetahs color are brownish with black spots
Look at "why has my fish got white spots?"
One can tell if a fish is a king salmon if the fish is blue-green at at the back and top of the head with silvery dies and white bellies. There are black spots on the upper half of its body with gray/black mouth coloration.