Yes.
No they do not. The water lice are parasites and will drink the blood of the goldfish.
yes, but it may kill the goldfish
it was blood
Yes, goldfish do have red blood. Like most vertebrates, their blood contains hemoglobin, which is a protein that binds to oxygen and gives blood its red color. The presence of hemoglobin allows goldfish to efficiently transport oxygen throughout their bodies, which is essential for their survival in aquatic environments.
Guppies and Goldfish should never ever ever be together.... EVER.
They must be warm blood then if the question gives us only one option...
Goldfish gills have thin, feathery structures called filaments that are covered in tiny blood vessels. As water passes over the gills, oxygen from the water diffuses into the blood vessels and carbon dioxide from the fish's blood diffuses out into the water. This process allows the goldfish to extract oxygen from the water for respiration.
Goldfish's live food range from blood-worms to brine shrimp. You can also feed them a small variety of grains and vegetables.
Blood comes out of your fish, that's how you can tell if something is bleeding.
Yes, I have a cousin that does and his goldfish are fine.
Pellets and flakes... but they ABSOLUTELY LOVE freeze dried blood worms
Good parents are omnivores. They eat commercial Cichlid food, goldfish food, blood worms... And just about everything else!