Why does the size of a fish change the breathing rate?
148646
I really dunno... but i do know that if an animal is small, it's heart beats very fast and if an animal is big, it's heart beats very slow. not that it's going to die or something...
306007
Fire away, as said before, there are no dumb questions.\n\nFish don't float because they are heavier than water, without the air pockets. They take in water in to go down and discharge water to go up, like a submarine.\n\nIf just sitting there and not going up or down is called neutral buoyancy. Fish then weighs the same as the water.
519170
if there is too much oxygen, that will over excite the fish and they can die. That is the case with everything. even if we are exposed to excess oxygen, we can die
639534
hell no , the exact opposite get the smaller ones out of the pond because they are the ones competing for resources with  the bigger ones so in order to prevent overpopulation kill of the smaller ones not the bigger ones, bigger gills have bigger babies
114432
Ok, I know that the bit about sharks not breathing if they're still is still taught at school, and essentially it has some point. It's true that gill oxygenation is better when the water flow through the branchial area is greater. \nBut sharks DO indeed stop swimming, they can rest near the bottom of the ocean (as if sleeping) and they use the pumping motion of the floor of their mouth (their mostly immobile tongue) to help water move through the gills. \nBut as I've said, immobile sharks lie mostly near the ocean floor. This is because they're rather dense with respect to water (they don't have swimming bladders like bony fishes do), although their enormous, fat-filled liver increases their buoyancy significantly (along with other physiological characteristics). When they swim, sharks can keep themselves in midwater; the movements of the trunk and tail generate the necessary thrust to keep them from falling to the bottom.
29859
The tissues and cells of creatures that inhabit the deep oceans are filled with fluid and thus air space is significantly minimized . Air is subject to compression, whereby a fluid such as water cannot be compressed.\n\nWithout internal compression, the creatures have negated the potential external pressure of the depths.
1032770
Read "aquatic adaptation" from any standard biology book. It will ans both ur qst.
82203
Fish can often be seen gulping air from the surface during heat waves when oxygen in the water is depleted, other fish eat from the surface
1148004
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.
778272
Metabolism does effect the lifespan, But i dont know about the growth\nLike, Males die before to females 'cause the metabolism in males is far far larger than in females\n\nBut when I searched in Google, I found a site\nAnd It contains relationships in BIVALVES, Mytilus (wow!)\n\n\n\nHere is the info....(http://www.springerlink.com)\n\nAbstract  Measurements of ingested ration, assimilated ration and metabolic rate in Mytilus edulis L. of different sizes have been integrated to provide an estimate of energy balance, which in turn describes the physiological state of the animal. These data allow the empirical determination of growth efficiency and ration. Growth efficiency increases hyperbolically with increasing ingested ration to reach a maximum, after which efficiency decreases as ration is further increased. The optimum ration for efficient growth increases with increasing weight of the mussel; maximum growth efficiency decreases with increasing body weight.\n\nCommunicated by J.H.S. Blaxter, Oban\nAccepted: 20 August 1974  \n\nhttp://www.springerlink.com/content/x4n1g0r158005m5n/
56609
They don't swallow the water, per se - they simply swim and let the water flow past their gills.  As the water flows throughout the network in their gills, the oxygen that's dispersed throughout the water enters their bloodstream, thus enabling the fish to breathe underwater!\n\nThis is why when one purchases a fish tank, one has to get an oxygen supplier as well - no fish can survive in just standing water for long!
235068
The first is surface area. The mammalian lung has a huge number pf alveoli compared to lung structures of reptiles and amphibians. The greater the surface area available for gas exchange, the more efficient will be the gas exhange.\n\nThe second requirement for gas exchange is assisted by the mamallian heart of four chambers as opposed to reptilian and many other hearts. There is an enormous amount of the circulatory system that passes directly to the pulmonary arteries and veins. Thus there is sufficient blood circulation in the lung area to remove oxygen and transfer it to the rest of the body.\n\nComparative biology will show far fewer alveoli in non-mammalian hearts (with the exception of birds). The other thing notable from compataive anatomy is that the mamallian heart (and that of birds) is a four chambered pump that does not mix unoxygenated blood with blood that has been oxygentated.\n\nSurface area and increased opportunities for deoxygenated hemoglobin to accept oxygen due to more efficient heart action.
448554
they use gills. the gills are filled with lots of blood vessels.  the fish draws in water from the mouth, which passes by and out the gills. as the water moves by, the blood cells take in oxygen and the waste gases are released.
871829
Well, first they adjust their body to the pressure, by jumping into the water and staying for a period of time.  I believe the suit also has some effect.\n\nThe pressure of water compacts the body in a way, so I would think smaller lungs for breathing, muscle cramps, etc.
853162
this is because gills of fish need a water flow through it so that the exchange of gasoues can occur
377764
They are different in structure and also in the way that gas exchange occurs. \nIn gills, the water flows in a single direction, and the blood flow in the blood vessels occurs in the opposite direction. Thus optimal gas exchange is achieved (there are good illustrations in textbooks to understand this better). However, to take up oxygen effectively, gills need an enormous surface area, because oxygen is relatively scarce in water. Thus, the gill lamellae are subdivided into smaller lamellae, and these in turn into even smaller projections; these extremely thin laminas are supported in water, but collapse onto each other in air, because of  surface tension and gravity. \nLungs can be of 2 types: the basic model comprises paired sacs, with more or less elaborate inner walls for greater surface area, but also with a surfactant substance that decreases surface tension so that these sacs do not collapse. The air goes in and out of the lungs by way of a single duct, thus there isn't a continuous flow of oxygenated air. Less efficient, but air has so much oxygen that it works anyway. The exception are the lungs of birds, in which the blood vessels are at right angles with respect to air flow, and the latter is continuous and unidirectional. \nAll respiratory surfaces need to be moist, and lungs are no exception. However, in this case the moisture is _inside_ the body, and the body surface is still mostly impermeable. \n\nThird choice... that would be perhaps the tracheae of insects. Aquatic arthropods have lungs of different types, and terrestrial chelicerates do have special gills too. But insects have a different system: ducts that pierce the body wall and project inwards, taking oxygenated air directly to the tissues (no participation of the circulatory system).
140188
I bet you could look this up on the web pretty easily. Why didn't you try?\n\nI bet the diffusivity is pretty good, however, because otherwise, how could fish breathe?