Sight, believe it or not their eyes are actually quite super.
a goldfish uses his/her fins for direction when it swims.
Since animals are eukaryotes, and a goldfish is an animal, you can assume that a goldfish would be eukaryotic rather than prokaryotic.
Since an oranda is a type of goldfish, they will be fine together
Since this is a simple question, no. Hell no.
When young, they are prey to larger fish, birds, turtles and otters and mink. Adults are preyed on by birds, otters and man for the most part.
They all originate from the same roots, but since goldfish that live outside are more used to the cold and other changes, I would say that goldfish that live outside are stronger and more likely to survive.
Goldfish do not get pregnant as they are egg bearing fish rather than live birthing
The average number of eggs layed by goldfish during spawning season is about 5,000. Since goldfish are domestic animals it is entirely up to the goldfish to decide how many of those eggs/fry grow into adult goldfish. Most professional goldfish breeds will choose about 50-100 of the best looking fry to grow into adult fish.
Some common breeds of goldfish are: the Black Moor goldfish, the Ryunkin goldfish, the comet goldfish, the common goldfish, the Calico Fantail goldfish, the telescope eye goldfish, the bubble eye goldfish, the pearl scale goldfish and the Oranda goldfish.
Goldfish® crackers become "The Snack That Smiles Back®" with the introduction of "Smiley" in 1997. This marks the first-ever alteration to our icon product since it launched in 1962.
This is really no different than an American goldfish, or even a Canadian goldfish since in most cases, they are basically the same fish type.It is totally dependant on the care provided to the fish, but the average age is about 9 years old.
They could be seeing themselves in the reflection of the glass of your tank, but since goldfish do not have the capacity to recognize themselves in a reflection they think it is another goldfish and attempt to swim towards it. It has nothing to do with having a short memory span as the previous answer said, because goldfish actually have a long-term memory span of about three months.