Why do carp breathe at the surface of the water?
541290
Carp can change its gill structure by having a lack of protruding lamellae (primary site for gas exchange) for survival in anoxic (without or limited oxigen) water. Therefore, they can breath air and forget about its oxigen consumption for around a month if they want.
894876
So they can breath. Their lungs aren't nearly as efficient as ours so they still require to breath through their skin, this can only be done on moist surfaces (this is also why our lungs are moist).
878508
Guppies don't really hear... And if they did, it wouldn't be by their gills. They use their gills to breathe. Instead, they follow vibrations. I'm not quite sure how, but I think they have a sense organ that detects vibrations in the water.
1035087
Oxygen is carried in the blood.  The oxygen transfers from the atmosphere to your blood through an exchange in your lungs...\n\nA fish's gills accomplish the same thing, but they get the oxygen from the water.
562934
It is a myth that sharks have to constantly swim or else drown.  As so often with exotic animals, apex predators in particular, we find such stories to be passed on through generations, and even tons of excellent studies on the animals cannot change commonly held opinion.  What is the basis for this wrongly held believe?\n\nMost "fishes" breath by producing a conintuous water flow over their gills making use of what is called the buccal/opercular pump.  You surely have observed fish in an aquarium before, and have noticed how they rhythmically open and close their mouths.  What you may or may not have seen was that in the same rhythm, only slightly delayed, a bone on the side of the head opened and closed.  What you saw was the buccal/opercular pump at action.  The bone on the side of the head was the operculum.  It covers the gill openings with the gills.  When the fish opens its mouth (i.e., the buccal cavity), the operculum is closed.  The fish fills its mouth with water rich in oxygen, opens the operculum and at the same time closes its mouth.  As an effect, the water is being pressed out through the gill openings and over the gills.  Next, the operculum is closed while at the same time the mouth opens and the cycle is repeated.  By this form of active breathing the animal can indeed achieve a constant flow of water over its gills. \n\nSharks, like all other elasmobranchs (i.e., sharks, skates, and rays) do not have operculi.  Instead, their gill slits are visible at the side of their heads.  Early biologists thought that sharks therefor could not be stationary at the sea bottom, since without an operculum they could not achieve water to flow over their gills and would certainly - believe it or not - drown.  Not quite so.\n\nIt is true, sharks usually breath "inactively", that is they achieve a constant water flow over the gills by swimming with their mouth slightly open.  But quite frequently, sharks can be found stationary on the bottom, where they breath actively.  Like teleost they achieve this feat by opening and closing their mouths.  The lack of operculu certainly makes this form of breathing less sufficient, but the gill openings are constructed like window blinds that are partially closed (or opened, in case you are an optimist...).  In other words, water can be pushed through in one direction, opening the gill slits, but if it were sucked the other way the individual skin flaps collapse on top of one another and close the openings.  It is not the most efficient form of breathing, but it works.  \n\nAt times, you will find animals that hover on the sea floor positioned in a moderate water current so that by simply opening their mouths the current constantly moves water over their gills.  But even without this current, sharks can do quite well breathing actively on the floor.\n\nI suggest, you take your son to an aquarium and check out some of the sharks on display.  I am sure their will be one or two specimens hanging out happily on the floor demonstrating what I just described.\n\nHope this helps.
124723
Carp are fish. They move forwards by swimming.\nCarpenters are tradespeple. They usually move forwards in pick -up trucks.
881373
The swim bladder controls the buoyancy of the animal. Normally the amount of gases in the swim bladder keeps the fish neutrally buoyant, and they can regulate these gases to go up or down in the water column.\nThis saves energy because the fish doesn't have to swim actively to stay in one place; even though their tissues are denser than water, they won't sink because the less dense gases compensate for this.
882542
Breathing, the process whereby an organism (living thing) obtains oxygen from its surroundings, to take part in internal chemical reactions which break down food to release energy. Breathing also usually gives out waste carbon dioxide as an unwanted by-product of these reactions. Breathing is one aspect of respiration, which is a term that includes both physically obtaining oxygen, and also using it in chemical pathways inside cells to release energy—the process of cellular respiration\n\nMany aquatic animals obtain oxygen dissolved in the water by muscle-powered movements, such as when the forward motion of a fish or the pumping actions of its mouth and throat force a flow of water over its gills ( See also Fish). This is underwater breathing. Tiny organisms “breathe” by the process of passive seepage or diffusion of oxygen through their body surfaces. Plants also obtain oxygen by diffusion from the air or water around them, usually into the leaves.
189813
Yes gasses in the air (oxygen, nitrogen, CO2, etc.) dissolve in the water (hence the fish and algae breath). Also many pollutants also dissolve in water (much easier than the gasses). If they are present in the air they will dissolve in the water, either by transfer (just the pollutants, not the gasses) or with the gasses.
1013531
They will do it by passing the water over their gills. Fish gills are full of blood vessels containing carbon dioxide. Through the process of osmosis, the small oxygen atom that makes up the water molecule is absorbed into the bloodstream and exchanged to carbon dioxide.
191368
1) diffusion of gases in excretory system\n2) their gills pump H20 over one side and splits it up so oxygen flows over teh other to extract 02\n3) C02 diffuses out of cells
1156564
Well, you can answer that on several levels.  As several people mentioned they don't have sweat glands in their skin.  But, at risk of sounding like a four year old, why?!\nThink about why you sweat.  The water contained in the sweat sits on the suface of your skin.  Due to wind and solar heating, that water evaporates.  That evaporation takes energy - specifically, heat energy.  Removing that heat energy makes you cooler.\nIf a fish sweated, the sweat would just go into the surrounding water and not do anything to help the fish.\n\nAn even better question might be:  are most fish cold-blooded because their ancestors were, or because it simply isn't worth the energy to become warm-blooded if you live in a liquid?\n\nSee...ask a silly question...get a long-winded answer...
520263
Well, their respitory system like their circulatory system allowed fish to live in the water for their entier lives. Most animals would die under the extreme water pressure and lack of breathable oxygen, but fish were able to adapt to live in the water.
865523
All fish swim with their mouths open at least a little. This is a big part of how water gets to their gills so they can take in oxygen and get rid of carbon dioxide.
423162
Rupali there are multitude of animals having gills to respire.Gills as a respiratory organs-Arthropods-Prawns,Shrimp,Mosquito at larval stage. All amphibians and Fish -some stage of life.All mammals on some stage of life.As in humans embryo.Practically all animals have gills as respiratory organs from non chordates Arthropod to Mammals.
264442
Hi,\nI dont think so... Ducks are amphibians (I think). That means they can live both on land and water. But they are primarily land creatures. I mean they cant go swimming forever can they?\nDucks can be found on small lakes too. Not neccessarily marshes.\nNo, I dont think all rivers have marshes. There is a river here in our town. It doesnt have marshes...
859454
Water is a much more stable environment than living up in the wind and snow on land.\n\nIn freshwater systems, the water beneath the ice on lakes and rivers doesn't drop below about 4 C (around 40 F).  If it gets colder than that, the water freezes, and floats up to the surface to become part of the ice cover.\n\nSo the cold-blooded fish living in the water get their metabolism lowered by the cold temperatures, but they can still survive - even eating and swimming about (just ask any ice-fisherman).\n\nIf a lake or river freezes right to the bottom though, the fish don't survive.  They get frozen, and new fish either have to repopulate the area the next summer, or the water body remains fish free.\n\nThere are some fish (especially in Arctic waters) that produce anti-freeze like compounds in their blood to keep them from freezing solid.  In salt water, the water temperatures can drop below the freezing point of the blood in a bony fish.  Without these compounds, the fish would indeed freeze.  \n\nIn particularly cold waters, the fish hover almost motionless, their metabolisms so low that they are almost dormant.  Any sudden sharp jostle or even brushing against an icy outcrop can provide a nucleation site for ice crystals to form, and the fish can freeze solid in an instant.  I've seen videos of this happening, and its kind of freaky.