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Hormonal treatments can advance spawning by two to three weeks. [5] Manipulating photoperiod can alter spawning time by over four months and is cheap and straightforward to achieve. [5] Broodstock managers can use or select for traits such as fast growth rates or disease resistance over generations to produce more desirable fish. [15]
Several koi swim around in a pond in Japan. (video) A school of koi containing multiple different varieties Koi (鯉, Japanese:, literally "carp"), or more specifically nishikigoi (錦鯉, Japanese: [ɲiɕi̥kiꜜɡoi], literally "brocaded carp"), are colored varieties of carp (Cyprinus sp.) that are kept for decorative purposes in outdoor koi ponds or water gardens.
It lives an entirely aquatic lifestyle in parts of North America in lakes, rivers, and ponds. It goes through paedomorphosis and retains its external gills . [ 4 ] Because skin and lung respiration alone is not sufficient for gas exchange, the common mudpuppy must rely on external gills as its primary means of gas exchange. [ 5 ]
Outdoor ponds tend to become miniature aquatic ecosystems, attracting various animals and plants (see water gardens for more information). In hot climates, it is important that pond temperatures do not rise to dangerously high levels that will kill the fish. [1] In the winter, fish may become sluggish and stop feeding. This does not mean they ...
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Sewage treatment plants mix these organisms as activated sludge or circulate water past organisms living on trickling filters or rotating biological contactors. [5] Aquatic vegetation may provide similar surface habitat for purifying bacteria, protozoa, and rotifers in a pond or marsh setting; although water circulation is often less effective.
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