Fish can't survive without water !
No parrot fish have a backbone and are a verterbrate. Invertabrates have no back bone or bones at all. That is how they are different from verterbrates.
Lamprey are the only species of fish that do not have a jaw, or fixed appendages, unlike other fish. They suck nutrients and organs from other organisms.
No, they are invertebrates (Echinoderms). Echinoderms have no backbones, like the Brittle Star and Sea Urchin.
All fish have backbones, all animals with backbones are vertebrates.
Colorations coupled with size and shapes and with the natural resistant to anemones make them unique.
no they don't they have caralige (they same stguff in your ears and nose) this is what makes them different from other fish
fish can be different
their blood type
they can live in different types of waters
Sharks have no swim bladder for buoyancy. Instead, an oily liver aids in bouyancy.
If you are at the point to where your other fish's life is in danger, consider moving them to different tanks.
it all depends on the species of fish. most fish don't give birth through sexual interaction. the females lay their eggs on a safe place, to keep them safe from other predators, and the male squirts a cloud of sperm on the eggs, and fertilizes them. than the eggs hatch on their own. for other fish, hte DNA coding that makes them the species that they are, cannot be crossed with another fish species. they are too different. if that wasa to occur and was successful, than the fish would either A- kill their child after birthing it, if the fish lives, or B- die during the birthing proccess because the fish has inherited a different form of getting out of the mother than the other fish species. why would you want to know that anyway???