What is the comparison of a fish body plan to that of a submarine?
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Both are hydrodynamic, that is, with the fusiform shape that is best to "pierce" the water when moving forward. In addition, such a shape maintains a laminar water flow around them (as opposed to turbulent). A laminar flow ensures support of the body (as opposed to sinking).\nMovement in water differs from terrestrial movement because the body may move in 3 dimensions; therefore, fish fins (comparable to the "flaps" of submarines... well I know nothing about submarine architecture so I guess that's not their name) counteract pitch (up/down tilt), yaw (left/right) and roll (rotation around the greater body axis).
1059653
You think submarines run on seawater, yet call those that might actually know what they're talking about and disagree with you government loving idiots?\n\nSubmarines are powered by nuclear reactors using either enriched uranium or plutonium as fuel.  They don't use seawater to cool the reaction, since it would corrode the plumbing.  About all they do with seawater is distill it for drinking, and separate the oxygen out using electrolysis, since they have a great deal of extra electric power available.\n\nThey have made cars that run on hydrogen, which can be separated from water, but the power requirements for the electrolysis still make this very inefficient overall.\n\nEdit:\n\nAnd to all those thinking about cars running on steam, this is not "running on water".  Some fuel has to be consumed to heat the water to create steam; you're not saving anything.  All the old steam locomotives carried a huge hopper of wood or coal behind them to burn.
763223
I guess to be "eel-like" having no legs, being aquatic and posses functional or vestigial or reduced fins. Lamprey move by moving their bodies back and forth, to create propulsin, this is undulatory. Sinusoidal movement is what snakes use, it is side to side "S" movements, where as eels and lamprey use more of an up and down movement, like a mountain chain (several mountains side by side) they say the undulating mountains.\n\nhope this helps!
683367
skin and organs which are adapted to face damn high pressure\nsome bacteria to produce artificial light\nuses fluorescent tentacles to lure prey.\n\nThe deep sea is also an extremely hostile environment, with pressures between 20 and 1,000 atmospheres (between 2 and 100 megapascals), temperatures between 3 and 10 degrees Celsius, and a lack of carbon dioxide.\n\nIt has also been found that the deeper a fish lives, the more jelly-like its flesh and the more minimal its bone structure. This makes them slower and less agile than surface fish.
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OMG!!!  We would all be forced to live in the mountains because everywhere else would be underwater. Thank you Sponge Bob for keeping us high and dry.\n\nActually no difference. They are saturated in water that would have been there anyway. And the solid parts are made from the minerals and organic compounds which already existed in the ocean. I believe that any calculation or measurement for ocean depth/volume would be the same with and without sponges.
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I don't think Finding Nemo set out to portray ocean life accurately. It's a fantastical story. As far as fish communication, I'm sure it exists, but not in the form of "talking." Fish communicate through body gestures most likely, and possibly some other means such as body secretions or even sound production. \n\nWhatever the means, though, fish communication is almost certainly centered around extremely basic topics such as keeping a school together or coordinated hunting in the case of larger fish like sharks.
809981
I was thinking this question only yesterday! How strange! I'd like to know the answer to this one too. I thought Tuna were smaller than Dolphins, so they can't escape through holes in the net.
114606
Yes. They need a coating on their scales to protect them against the change in water condition. Some sharks can do this as well as some salmon...but in a tank....there is no way for them to live on.
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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".
951347
Super-silent obviously is good for submarines.  High-tech is irrelevant.  The question is how efficient, reliable and cost-effective it is.  The chance the US navy has overlooked such a technology is about 1 in a gazillion.
1015804
The best comparison is found at the J.D.Power site, \nbut I think Sea Ray is the best!!!
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Some fish are warm blooded such as tuna and the great white shark.\n\nHow Hot Tuna (and Some Sharks) Stay Warm\nScientists now have direct evidence that the north Pacific salmon shark maintains its red muscle (RM) at 68-86 degrees Fahrenheit (F), much warmer than the 47 F water in which it lives. The elevated muscle temperature presumably helps the salmon shark survive the cold waters of the north Pacific and take advantage of the abundant food supply there. The heat also appears to factor into the fish's impressive swimming ability.\n\n\nLamnid sharks maintain an elevated temperature in the red muscle concentrated in their mid-region near the backbone. This specialized anatomy allows the predators to swim fast and continuously, which in turn, allows heat to be retained in the core of the fish leading to local warm-bloodedness. In most other fish, the red muscle is located close to the skin, yielding a fully cold-blooded body and only short bursts of rapid, powerful swimming. (Credit: Zina Deretsky, National Science Foundation)\n\nDuring what some would say was a better-than-average day at work, Robert Shadwick of the Scripps Institution of Oceanography and his colleagues went salmon shark fishing in the Gulf of Alaska. After catching specimens over 7-feet long and weighing more than 300 pounds, the researchers measured temperatures throughout the sharks' bodies and tested the mechanical power of RM samples.\n\nTheir results, published in the Oct. 27 issue of the journal Nature, showed that at 50 F, RM produced only 25-50 percent of the power it produced at 79 F. The researchers concluded that RM temperatures below 68 F could permanently impair muscle function.\n\nNational Science Foundation (NSF) program manager, Ione Hunt von Herbing said, "Knowing specific details about the anatomy and physiology of salmon sharks provides key insight into their ability to produce such power and speed during swimming. The knowledge could translate into better designs for underwater vehicles."\n\nThe study was funded by NSF's integrative organismal biology program.\n\nSalmon sharks are lamnids, a group of sharks that also includes the mako and great white. Numerous studies have shown that lamnid sharks and tunas share many anatomical and physiological specializations that endow them with their impressive swimming power and speed. In contrast to other fish where the RM is near the skin, the RM of these sharks and tunas is near the backbone. Even though the ancestors of bony tuna and cartilaginous sharks diverged more than 400 million years ago, selection pressure for high-performance swimming in each group seems to have occurred independently about 50 million years ago.\n\nThroughout its life, a salmon shark never stops swimming because it will sink. The body heat generated from continuous swimming elevates the RM temperature, which in turn, warms the surrounding white muscle and allows the shark to survive the frigid waters of the north Pacific. If a shark stops swimming, it could die from cold exposure.
112480
Hello, Every subamarine contains ballast tanks that when the needs to sink  it takes in water, due to the pressure and weight the submarine sinks and goes underwater and is propelled through propellars. When it needs to rise to suface, it lets the water out slowly and air comes and fills its ballest tanks and the submarine comes to surface. \n\nThats' it works, more info, check the web
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Submarines (especially nuclear) are the best combat machines ever developed by man.  A nuclear submarine can carry enough fire power to turn the entire world into a burnt piece of charcoal and can stay submerged as long as their is food to eat.  Their virtually undetectable if you handle them right and can turn the tide in almost any battle.  There are a few disadvantages though but their mostly contained to the crews themselves.  The biggest is the threat of death from another submarine (torpedo's, nuclear weapons, etc) that would kill the entire crew instantaneously.  Also, in nuclear subs you also have to worry about reactor problems, because if you're reactor starts leaking there's nowhere to run.
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Unlike marine mammals such as whales and dolphins with lungs that store oxygen from the surface air, fishes have gills. Gills are a series of membranes located on each side of the fish that function as respiratory organs. As water passes over this system of extremely fine gill membranes, the fishes absorb the oxygen from the water. The gills contain a network of fine blood vessels (capillaries) that take up the oxygen and diffuse it through the membranes. When fishes are taken out of water, they suffocate, because their gills collapse and they are unable to absorb oxygen.In many ways, the interior of the fish resembles that of many other animals. The digestive, circulatory, and nervous systems are very similar to those of other vertebrates. However, what really makes a fish different from other animals is its respiratory system. \n\n\n\nA fish’s respiratory system is determined primarily by the fact that it spends its entire life in water. Unlike the marine mammals such as whales, a fish has evolved in such a way as to not require frequent trips to the surface to breathe air. Fish have developed gills, on which they rely for the oxygen necessary for a fish’s limited metabolism. \n\nMany animals have gills at some stage of their life (even humans have them at an early stage of their development in the womb), but fish retained these gills and they are still a functional part of their anatomy. Fish use their gills to extract oxygen from their watery environment. The process starts with the fish’s mouth, which is how the fish takes in water. When a fish opens and closes its mouth, it is actually pumping water back through the gills and is thus breathing. Most fish have an effective pumping system that involves the mouth and the outer cover of the gills, called the operculum. When the fish’s mouth opens, the operculum closes, drawing water into the fish’s mouth. When the fish closes its mouth, the operculum opens, allowing fresh water to cross the gills. Other fish have a less effective pumping system, requiring them to swim constantly to keep fresh, oxygenated water flowing over the gills. These types of fish, such as tuna, generally swim with their mouths partly open. Incidentally, while many fish have nostrils, the nostrils are used only for a sense of smell, and play no part in respiration. \n\nOnce through the mouth, the water continues past structures called gill rakers. The gill rakers are essentially a filter system for the gills, straining the water to sift out floating food particles or foreign material. After passing through the gill rakers, the water continues through the gill arches and actually passes over the gills, which are suspended between the mouth cavity and the operculum. Each gill is made of two rows of gill filaments, which are extremely thin membranes sticking out into the water flow. Each of the gill filaments is composed of rows upon rows of lamellae, which are thin, disc-like membranes loaded with a capillary network. The water flows across the lamellae, and oxygen and carbon dioxide are exchanged directly across the capillary membrane. The capillaries are situated to take best advantage of the water flow; fish can actually extract up to 85% of available oxygen out of the water. Since water contains only 2-5% of the available oxygen that air at sea level does, such a high efficiency is extremely important. \n\nFrom the gills, the deoxygenated water passes out the operculum, and the oxygenated blood joins the circulatory system. Despite the efficiency, some fish require more oxygen than others. This helps to explain why some fish thrive in specific habitats. For example, trout prefer northern streams because the cool water of the streams tends to retain dissolved oxygen, and the active trout need the extra oxygen. Carp, on the other hand, are sluggish and do not need as much oxygen, which is why carp can thrive in warm, relatively stagnant ponds, such as ornamental ponds. Goldfish, unlike most f
187882
It is the science of planning to build, building, testing and managing underwater, semi-submerged or floating structures (buildings, pipelines, oil rigs, drilling, cable laying, etc.) on or in the ocean.\n\nIf this is the best answer, please rate this the best answer. Thanks.
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Fish eats seaweads and some fish eats fish.  What kind of proof u need just dive and u will see the proof