Can dolphins live in fresh water?
105990
Dolphins do live in freshwater, but you can't take a dolphin that lives in salt water and put them in a freshwater environment. \n\nHere are some dolphins that live in freshwater.\nBoto http://en.wikipedia.org/wiki/Boto\nChinese River Dolphin http://en.wikipedia.org/wiki/Chinese_River_Dolphin\nGanges and Indus River Dolphin http://en.wikipedia.org/wiki/Ganges_and_Indus_River_Dolphin\n\n\nPlaces like SeaWorld have salt water tanks--
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A dolphin reproduces by laying belly to belly. The female is on top and the male swims beneath her. She will usually mate with several males in one season. This is thought to believed to be a strategy to help protect her young. Male dolphins sometimes get aggressive towards calves and may even kill them if they are not their own. By mating with several males, the female as well as the male(s) have no idea who the father is, and is less likely to attack a baby.
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They are mammals, so they have lungs and can not absorb enough oxygen to survive.  Dolphins evolve from a land animal that return to the sea.  There is a belief that dolphins can absorb oxygen from the sea, but because they are warm blooded, they require large amount of oxygen, which sea water can't provide. Many warm blooded animals evolve to become sea creature, because of the abundents of food.  Warm blooded animals are smarter and in some ways faster than cold water animals, gave an incentive for some species to become sea creatures.  Warm blooded animals though require large quantity of oxygen to run its supercharged matabolism, which why fish never evolve into being warm blooded.
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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.
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Fresh water creates a hypotonic environment for aquatic organisms. This is problematic for some organisms, whose cell walls will burst if excess water is not excreted. Some protists accomplish this using contractile vacuoles,[2] while freshwater fishes excrete excess water via the kidney.[3] Although most aquatic organisms have a limited ability to regulate their osmotic balance and therefore can only live within a narrow range of salinity, some fishes have the ability to migrate between fresh water and sea water.\n\nAs with many aquatic animals, most fishes release their nitrogenous wastes as ammonia. Some of the wastes diffuse through the gills into the surrounding water. Others are removed by the kidneys, excretory organs that filter wastes from the blood. Kidneys help fishes control the amount of ammonia in their bodies. Saltwater fish tend to lose water because of osmosis. In saltwater fish, the kidneys concentrate wastes and return as much water as possible back to the body. The reverse happens in freshwater fish, they tend to gain water continuously. The kidneys of freshwater fish are specially adapted to pump out large amounts of dilute urine. Some fishes have specially adapted kidneys that change their function, allowing them to move from freshwater to saltwater
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Dolphins swim in front of boats. Not for play, but it is due to the Water around the bow of the boat creates a low pressure system. So, the dolphins get pushed by the boat and do not have to swim as hard to cover vast distance. \n\nAs for fish swimming under whales, it is the same reason. The huge whale disturbs the rigidity of the water making for easier swimming. That is of course if you are talking about fish right up against the whale. \n\nOtherwise, A fish following a whale is just following. Doubtful, it is looking for a scrap as many fish do not comsume kreel. As whales do.\n\nAnimals much like humans are Lazy when it comes to spending energy. Geese and ducks fly in Vee formations for the same reasons. Disturbance of the air.
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alligators have a frog rounded shaped mouth and live in fresh water most of the time. Have been seen in salt water.\nCroc's have a long snout.  And Usually reside in salt water.
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A dolphin has a three chambered stomach, similar to an ungulate (cow or deer), pointing further to its evolution from a terrestrial ancestor. Since dolphins do not chew their food, the mastication of their meal is taken care of in their first or fore stomach. The majority of digestion is processed in the main stomach or second chamber. The last section of their stomach, the pyloric stomach, takes care of the remainder of their digestion prior to the contents emptying into the intestinal region.
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Land animals can walk on land and breath oxygen. With the exseption of dolphins and whales the others cant breath oxengen.
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It all depends on the species. Most dolphins have between 100 and 160 teeth, although they can have as many as 250 or as few as 14!
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How long do dolphins actually live? \n\nIt depends on which species you are talking about. Bottlenose dolphins may live for 50 years, but most only live for 25 years.
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You want to check out Key West or Key Largo...\nand here you can swim with the dolphins\nhttp://www.dolphinworld.org/fl-swims.htm\n\nGood luck
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It is actually easier for fish to live in salt water than fresh water because the ionic balance of the water is closer to that of their own blood. Fresh water fish constantly have to pump out the excess water they accumulate due to osmosis. Marine mammals (seals, whales etc) maintain their ionic balance in water by having protective compounds in their skin which acts as a waterproof barrier.
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marine fish live in a salt water environment, and fresh water fishes live in a non-salt water environment. Except for a few small cases, the two cannot live in the other's environment due to the way they are used to living.\n\nIt is the same idea as to why we can't drink salt water. We would be considered "fresh water" while other animals can drink salt water, so they would be considered "marine".
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the first response is mostly correct, fish have air bladders and most benthic fish (bottom dwelling) rarely leave the tremendous depths that they live in.  think about a whale which breathes air as we do, they can dive to well beyond the crushing depths of submarines, yet they have no problems with going up and down the water column all the time. they physics behind this are simply, they are adapted to their environment, whcih is the case of whales is both the surface and the lower levels of the ocean. \n\nwhales are a fascinating case, they are able to collect the dangerous by-products of deep diving in their bodies, either through air bladders and special ability to remove toxic gasses from their blood, but they are essentially mammals like humans; obviously you know they breathe the same air we do.  interesting question.  please read more about the ocean if you are interested click the link
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Adults range in length from 2 to 4m (6 to 13 feet) and in weight from 150 to 650kg (330 to 1430 pounds) with males being slightly longer and considerably heavier than females on average. The size of the dolphin appears to vary considerably with habitat. Most research in this area has been restricted to the North Atlantic Ocean, where researchers (Hersh and Duffield, 1990) have identified two ecotypes. Those dolphins in warmer, shallower waters tend to have a smaller body than their cousins in cooler pelagic waters. For example a survey of animals in the Moray Firth in Scotland, the world's northernmost resident population, recorded an average adult length of just under 4m (13 feet). This compares with a 2.5m (8 feet) average in a population off Florida. Those in colder waters also have a fattier composition and blood more suited to deep-diving.
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You'll have to go scuba diving. They live in the sandy bottom of the ocean just outside of the surf zone, well below the low tide level. Depending on how big the surf is in the area, they are likely to be in ten to thirty feet of water along sandy beaches and will be partially or shallowly buried in the sandy ocean bottom. I've seen them here many times when beach diving. \n\nYou can occasionally see an unfortunate sand dollar that has washed up on the beach that is still alive. If it is sort of furry, it may still be living. When they die they loose the outer velvety spines and become the smooth 'dollars' we are used to finding. \n\nHere is a website that explains a lot about sand dollars:\nhttp://www.wildsingapore.com/chekjawa/text/s620.htm