fish that live at the bottom of the ocean, where it is very dark,have developed adaptations for finding prey,avoiding hunters, and attracting mates.
199367
Good question!\n\nOne of the coolest adaptations that deep sea organisms have is called bioluminescence.  This allows the organisms to actually produce their own light!  Many of these organisms use the light to attract mates.  Predatorial fish take advatange of this fact, and can lure in unsuspecting prey by simply producing light (in other words, they pretend to be a potential mate).\n\nThe depths of the ocean can be extremely cold, and food can be quite hard to find.  So these organisms have a tendency to gravitate towards sources of food (such as decaying matter) and sources of heat (watervents).  By simply 'coming together' to look for food and heat, they make it much easier to find a potential mate.
653270
fish will only grow as big as comfortable for the space they live in, if they are in a very small pond they'll stay small for years but, the minute they are in a big body of water they will get huge fast.
368143
Some do, most don't. The Nurse shark is an example of a shark species that sleeps. It has it's nap in daytime. You can find them under rock overhangs or in small caves. I've crept up to 10 footers having a doze. They wake at night and hunt the reef.\n Most other species, however , have to move to survive, so sleep is not an option.
51970
most likely fish, or another animal that lives in water, perhaps an early reptile
602863
Sensory and nervous system\nFishes have well-developed nervous systems that organize around a central brain, that is divided into different parts. The most anterior, or front, end of the brain are the olfactory bulbs, which are involved in the fish's sense of smell. Unlike most vertebrates, the cerebrum of the fish primarily processes the sense of smell rather than being responsible for all voluntary actions. The optic lobes process information from the eyes. The cerebellum coordinates body movements while the medulla oblongata controls the functions of internal organs. Most fishes possess highly developed sense organs. Nearly all daylight fish have well-developed eyes that have color vision that is at least good as a human's. Many fish also have specialized cells known as chemoreceptors that are responsible for extraordinary senses of taste and smell. Although they have ears in their heads, many fish may not hear sounds very well. However, most fishes have sensitive receptors that form the lateral line system. The lateral line system allows for many fish to detect gentle currents and vibrations, as well as to sense the motion of other nearby fish and prey. Some fishes, such as catfish and sharks, have organs that detect low levels electric current. Other fishes, like the electric eel, can produce their own electricity.
26450
you have to know that submarine is just found in last 50 years, i guess. But the creatures in the deep ocean are actually involved to live or do activity in that kind of enviroment in few thousand years, even million years.\n\nFor example, if you bring those creatures upto few ft. deep water that could actually kill them in that pressure, even sunlight. On the other hand, just as you said, we can't go that deep because we are not belong to live in that kind of enviroment.\n\nAnd something about Oxygen, I don't sure there would have it or not, but i am sure one thing that some plants in deep ocean consume the heat and minaral near underwater volcano or "hotspring"( I don't know how to call them). So I think the fishes may consume other elements than oxygen.
282938
they are starting to pick up out there i would wait a month and it should be hitting.If your interested in other species as well ,the white sea bass are biting when the weather is good and you can fish around the kelp areas for calico's and yellows .you can check witht e boats that go out of santa barbara area the usually have a fishing report daily that will que you in as when to head out there.\ngood luck
215561
you can go and live by the beach and have a pool at your house and you can go deep sea fishin(i did that once)if you use chuncks of dead fish it works as bait(i leave by the beach in the Philipines, its really hot here and the fish r big, but i never go fishing cuz im not patient enough, but i have a deep pool in my yard too)and if you hava a house by the beach you can also go scuba divin.
361625
Animals that live really deep, like squid, whales, octopus, and some deep-water strange fish (Anglerfish, etc.)
662644
You have had a couple of low pressure systems go through your area recently, dropping a lot of rain and messing with the water Ph and the barometric pressure. Fish are sensitive to that; give it some time and once high pressure and slightly warmer temps hit, they should start biting again.
464287
The colouration may not make as much sense on land, when they are waddling about, but in the sea as they 'fly' through the water in search of fish and squid and other yummies, it is actually a highly effective form of camouflage.\n\nCalled counter-shading, it makes them pale from below, blending into the brighter background of the surface, and dark from above, blending into the stygian blackness of the abyssal depths.\n\nA lesser form of counter-shading is common in many terrestrial critters as well, where belly fur is often paler than the pelage on the dorsal surface.  Dogs, kitties, even squirrels and bunnies often show this same pattern.\n\nIn the watery environs of a pelagic predator, it is even more effective due to the greater degree of contrast in the environment, and the lack of effective cover in which to hide.  \n\nCounter-shading can be seen in critters like sharks, dolphins, swordfish,  and tuna.\n\nHere's a picture of a tuna showing counter-shading http://www.panamafishingandcatching.com/tuna/preultimo-tuna-tunalarge.jpg\n\nAnd one of a shark http://na.nefsc.noaa.gov/sharks/img/27.jpg\n\nProbably the best examples of counter-shading would be the orca (aka killer whale), and the manta ray.  Like penguins, they are very distinctly black on the back and white underneath.\n\nManta ray http://www.no-pest.com/MantaRay.jpg\n\nOrca http://orca-voyance.auraciel.com/orque2a.jpg
304367
they live in different environments
195684
buy blue crab cut it up put blue crab on hook cast off a dock  they love being in dark water  the dock makes a shadow across the water leaving every thing underneath it dark
231172
Starfish live on the bottom, in shallow and deep water.\n\nGiant tube worms have been found at great depths on the bottom.  Also crabs.\n\nSome jellyfish also live very deep where there is no light.
562950
They swim while hunting, so they need them to go fast enough to catch fish
261227
In order to withstand pressure, their cells must counterbalance the extreme pressure outside. Also, animals at such depths are generally colourless and are blind. They navigate by sound.
485358
Yes.  Blind cave fish (info link below) have evolved that way from living in the dark.\nAs far as humans are concerned it would take quite some time for that to happen I would think.\n\nhttp://www.bio.brandeis.edu/~sekuler/senpro/topic_1_stuff/sensory_deprivation.html  is a link to an article about sensory deprivation.