How do a grow a set of gills?
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Cut a pair of gills off a fish and get an insane surgeon (or maybe an insane  sturgeon, LOL ) to graft them into your trachea.
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Fry and fingerlings are not raised on artificial ponds, they are raised on tanks, pools or man made habitat.\n\nControling the water pH, air and salinity. You will need some equipment to do this, try starting with small handheld before investing on larger-expensive equipments.\n\nAeration is important, making sure that there is enough oxygen in the water. Water source being pump into tank at regular rate to avoid build up of unwanted gas, yes fish inhale oxygen and expel gas.\n\nFeeds are also important, you can either buy, or make, making feeds, you will need knowhow.\n\nFinally, there is a ratio on how many fry/fingerling to a certain size of tanks.
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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.
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Well they have to have a base to grow from.
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It depends on what sort of microorganisms you wish to grow.  If you'd like protists, just go to any local pond, take a sample of the water and you'll have an instant microcosm.  If you're specifically interested in bacteria or fungi- all you really need to do is leave out some moist, fatty nutrient-rich substance (like milk) and soon enough mold spores (mold is a fungus, by the way) in the air will settle and grow, as will bacteria.  (It's important to note that there is no such thing as "spontaneous generation" - These microorganisms will grow from air-borne spores or spores that are already present in the container / within the substance you grow them.  They don't just simply generate from nothing.)
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People with gills look like fish.
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water... it's the nutrients, minerals etc. IN the water that makes it grow
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The gill works by providing a surface where the water (which has dissolved oxygen) comes into contact with the blood of the fish. The blood circulation within the gill is arranged in such a way that it flows in opposite direction to the flow of water (=countercurrent arrangement). Because oxygen will tend to flow (diffuse) from the site of highest concentration to the place of lowest concentration, this arrangement ensures that oxygen will always flow from the water into the blood.\nOxygen is not as abundant in water as it is in the air, so for aquatic animals, oxygen concentration is a major limiting factor. The best way to ensure that enough water is "scanned" for oxygen at the gills is providing a really large surface area for gas exchange. Thus, each gill is formed by filaments. Each filament has secondary lamellae that rise perpendicularly to the surface of the filament. The total surface area is extremely large with respect to the volume of the gills. \nGas exchange occurs at the secondary lamellae, and it's here where you can see the countercurrent circulation. \nSee picture here:\nhttp://www.fishdoc.co.uk/images/Gill_-_gross_view.jpg\n\nThe water is passing between the gill arches, toward the medial part of the gill, and the blood is circulating in the exact opposite direction. Thus, the water always encounters blood that has less oxygen, and diffusion of O2 continues toward the blood. See this diagram for an easy visualization:\nhttp://www.marinebiology.org/images/countercurrent.GIF\n\nI hope this helps.
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Put a fish in the water and see if it dies, if it doesnt then there is oxygen in the water. If it does then shame you have to buy another fish!!!
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You have to hold your breath and keep your eyes open or wear goggles.\nPut your head down into the water and put your feet up in the air out of the water. It is easy if you can swim under water. Learn that first.
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http://ndsuext.nodak.edu/extpubs/alt-ag/tilapia.htm\n\nYou will probably need a net.  They eat moss.
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It is growing fish in artificial environments, for release into the natural environment. Trout hatcheries for example.
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With a water softener.\n\nhttp://en.wikipedia.org/wiki/Water_softener
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You can check out this site, it explains a step by step technique:\n\nhttp://www.pall.com/biosepra/34696_7290.asp
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Stamina comes with practice. If you have a difficult time continuously swimming long distances, break your workout down and do a pyramid or ladder set. Pyramid sets you gradually increase the distance of each set and finish with your longest distanced set. For example, 5 sets of 100, 200, 300, 400 and 500. Ladder sets you increase your distance, then decrease and finish with a short distance. For example, 5 sets of 200, 300, 400, 300 and 200.Increase your distances or the number of sets as you get used accustomed to the sets. Set a goal of how many yards you will like to accomplish in your workout. If you workout for an hour, try to complete 3000 yards, then increase to 3200 and so on.
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Swim under the water.  That builds up more endurance.  Go side to side in the pool.  You can probably go one way without taking a breath.  You definitely need goggles for this. Underwater is often the fastest way because there is less turbulence.
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It is a little hard to explain. It can be a difficult task. You basically have to skin them. What we normally do is to take a small axe and chop down the back bone and cut the top fins off then take a sharp knife from that point down the sides right under the scales skinning it around the sides. I hope that this helps you, I know it is a little vague. Usually the bigger the fish the easier it is. Happy eating, Gar Fish is a very tasty fish when cooked right.