Typically red lines are blood streaks (normally first spotted in the fins) caused by stress.
Check your water quality for ammonia, nitrites, and nitrates, they should be 0, 0, and less than 10 respectively; if they are not, do an immediate 75% water change in your tank making sure that the new water is the same temperature as the old water, and that you add in the recommended dosage of water conditioner per the directions on the bottle.
In addition, add in the dosage of Aquarium salt per the directions on the packaging for reducing stress.
Black dots on a goldfish are a symptom of a disease called ick.
it has finrot. change the water or buy medicine.
If your goldfish has red patches, is losing its tail and has a fin clamped shut, this could mean that it is sick. You should take it to a vet if possible.
if your goldfish lives in you then yes
All goldfish are freshwater.
IF you mean literally a goldfish, no. Just no. Otherwise provide information on what you mean by a "goldfish".
No, goldfish should only live with goldfish with a few small exceptions that do not include red ear sliders.
what does breed mean what does breed mean jasmine
Nothing. A goldfish is a goldfish, not a gold fish.
it was blood
yes
It is most likely that the food you are feeding it with, has red dye in it.
Un poisson rouge is 'a / one goldfish' in English.