if the goldfish's mouth couldn't open then it wouldn't be able to eat and it would end up dying.
It'll eventually die, that's for sure.
he wouldn't be able to eat
A goldfish left in the dark would gradually, over time, turn completely white. This is because the color pigmentation cells responsible for the fish's bright color, cannot work without sunlight. It would, however, take a very long time for a goldfish to lose 100% of its color because they have so many color pigmentation cells in their scales.
Axolotls will eat anything meatwise they can grab so a goldfish would be fair game.
No. Generally, fish cannot breed across different species. Also, guppies cannot tolerate water temperature changes that goldfish can, so they would not last long in the same tank.
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Goldfish have pharyngeal teeth which are near the back of the throat, so they may chew their food in some way, but not the same way that humans or animals with normal teeth would
It would die because of lack of oxygen, and lack of food.
You would have your mouth burned, or would be tortured.
Sperm would come out of your mouth
Jordan, why would you do that. /).-
The dragon goby is semi-aggressive, but mainly feeds by sifting organisms out of the mud. In general, like most fish, they will eat anything that fits in its mouth. A fancy goldfish can reach 10"-12" and a dragon goby can reach 24". It would seem that once the goldfish reached a large enough size, it would be safe. I would not put a 2" goldfish with a 24" goby.