Do fish realize that coral is made of dead fish?
913382
Coral is actually a living organism, but when it dies it turns white. And i dont think fish have the brain capacity to 'realise' anything....lol
334962
Depends on the lighting. Some fish are blind in underground caves and do not see at all. The majority are very aware of their surroundings both with sight and chemical/electrical sensitivity. Sound has an effect with communication. Sight is but one mode of sight seeing. Deep sea creatures are capable of producing artificial light but I do not feel that there is nothing artificial about it. Seeing well is a matter of survival.
145599
That depends entirely on the fish species and its age and lifestage.\n\nAs others have pointed out many fish like trout or eels will move from fresh water to salt as a normal part of their life cycle. Many other fish trevel between fresh and salt water at will.\n\nHowever if you take a purely freshwater fish, one that has evolved to live exclusively in fresh water, and you drop it into salt water it will  shrivel up and die.\n\nFish don't have waterproof skins. When you place a freshwater fish in salt water osmosis will draw water out of its body far faster than it can be replaced. The fish will become dehydrated and basically die of thirst.
172533
Yes. Some populatons live mainly on fish, others live almost exclusivly by killing and eating seals, penguins, other species of dolphins and the calves of true whales.
359291
Not most fish, all fish.
576560
Hollow-bodied animals are the second simplest invertabrates. Some examples are jellyfish, hydra, coral, and sea anemones. Hallow-bodied animals are invertabrates with one opening and a hollow center.Hollow-bodied animals are like sponges in some ways. Hollow-bodied animals live in water, and some of them look like plants.Some hydra, sea anemones, and most coral attach themselves to rocks or the ocean floor.Some, like jellyfish swim or float in the water. Hollow-bodied animals can regenerate or regrow missing body parts.Hollow-bodied animals are more complex than sponges because they have a mouth and tentacles that help get their food into their mouth. Tentacles also can protect from predetors because they sting. Coral unlike hydra and sea anemones lives in colonies or large groups. Coral may look like tree branches and can be used in many different ways like for decorating.
114370
I would say no, since dogfish are a marine (salt water) 'fish' & catfish are fresh water fish
459069
Think of an ant on top of mount everest,thats relationship between a fish and the ocean.There are over a a trillion fish in the ocean.
351257
Probably a mutualism in which coral provides structure, support, and security, while the algae provide energy for the coral.
415873
Clown fishes are indeed Actinopterygii, or fishes with skeletal bones.  (In ichthyology, that is the biology of fishes, the plural fishES is actually alright to use when you speak of more than one species.  If you are talking about more than one individuals of one species, you use fish.)  To be exact, they are a member of the largest group of bony fishes, the teleosts.  \n\nBut from a biologist's point of view "fish" is not really a true biological category - or as we say in biology, no real monophyletic group.  It's one of those names under which all animals are subsumed that have a certain shape, that have fins, and that have gills.  But the chondrichthyes (the cartilageous fishes) are very different from the teleosts; it is almost as if you compared a mammal like a mouse, with gecko.  Most ichthyologists (or fish biologists) would therefore say that clown fishes are really teleosts.\n\nThe interesting thing about the different species of clown fish is that they change their sex throughout their life.  For example, the blackfinned clownfish (Amphiprion percula) is protandrous, which means they start out their lives as males and then later in life turn into females.  What determines the exact timepoint of this change is actually social behavior.  Normal Amphiprion percula live in symbiosis with an anemone (meaning the clownfish protects the anemone against certain predators, while the anemone offers protection to the clownfish between its tentacles).  Usually there is one female with a harem of a few males in the anemone.  When the female dies the male of the highest rank begins to change into a female.  This change is controled by hormones, and the hormone levels change in response to the altered social condition (i.e., the female being gone).  There are other hermaphrodite species, like the blue-headed wrass, that start out as females and then turn into males, a strategy called protogynous.  \n\nWell, that bit on hermaphrodism was more than you asked about.  But it's a cool bit, and so I thought I'd throw it in here.  Hope you liked it...
947329
They don't...their shells grow with them.  Only hermit crabs get brand new shells.  Everything else either molts or has a shell that grows with the body.
397464
Hermatypic corals (the ones that form coral reefs) have symbiotic zooxanthellae (unicellular algae) within their tissues; the algae receive protection and housing from the polyps, and enable them to produce their calcareous exoskeleton.\nThere are sea anemones that attach to the dorsum of crabs, marine snails, etc. Thus the anemone "travels free" and the other animal is protected. \nMany species of small fishes and crustaceans shelter beneath the umbella of some jellyfish (read example at the link).
302119
Guam has a problem of starfish eating away the coral. At least that is what I heard when I as there back in 1971
1167920
There are a whole lot of apples and oranges mixing up here.\n\nThe Great Barrier Reef off Queensland is an ecosystem made up of many thousands of species of organisms. As an ecosystem, it's been accreting more or less continuously for a long time (since probably the Cretaceous Period). But during that long time the species of reef builders (corals and algae) have changed.\n\nThe modern stromatolite example is from Shark Bay, Western Australia. These stromatolites look very much like Precambrian ones. They are made of/by blue-green algae (cyanobacteria). So while the stromatolites could be considered an example of a type of ecosystem that hasn't changed for 600+ million years, the individual algal organisms themselves only live for a few days or weeks.\n\nSo the Bristlecone Pine is the oldest living single organism.
483612
No, it's Coral.  Just like the addy says it is.\n\n   Someone is pulling you leg if they told you it was.\n\n    Bob J.
350661
i think its because they feed on small fish that are visible from over the sea, or maybe they love what the humidity does to their hair/ feathers\naksugar06 what the hell are you talking about
1072244
It's an interesting question.  The reason that clown fish are not eaten by their host anemone is that the fish rubs its body along a gland of the anemone that excretes a protective film.  The anemone uses the same film on its tentacles to recognize itself and not accidentally attack itself.  Now, when a clown fish has been attacked, it is most likely bleeding and presents non-protected parts of its body to the anemone.  I wouldn't be surprised if the fish were eaten...