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Fish raised as feeders do not get the same degree of care as non-feeders. Fishless cycling avoids this potential problem. Fishless cycling also allows the aquarium to be completely stocked from the moment it is cycled if the aquarium can handle a high enough concentration of ammonia. This means that for large aquariums, where fish must be added ...
Therefore, new tanks have to mature before stocking them with fish. There are three basic approaches to this: the fishless cycle, the silent cycle, and slow growth. Tanks undergoing a "fishless cycle" have no fish. Instead, the keeper adds ammonia to feed the bacteria. During this process, ammonia, nitrite, and nitrate levels measure progress.
Cycling refers to establishing bacterial colonies that regulate the nitrogen cycle, the conversion of ammonia to nitrite and finally to nitrate. There are two means of cycling a tank: Fish-in cycling whereby the fish produce waste and are the key ammonia source for the cycle, and fishless cycling whereby liquid ammonia solution or decaying fish ...
Recirculating aquaculture systems (RAS) are used in home aquaria and for fish production where water exchange is limited and the use of biofiltration is required to reduce ammonia toxicity. [1] Other types of filtration and environmental control are often also necessary to maintain clean water and provide a suitable habitat for fish. [ 2 ]
Commercial application started in 1988 at a farm in Tahiti (French Polynesia) using 1000m 2 concrete tanks with limited water exchange achieving a record of 20–25 tons/ha/year in 2 crops. [5] A farm located in Belize , Central America also produced around 11-26 tons/ha/cycle using 1.6 ha poly-lined ponds.
The maximum load of organisms that can be cultured in a raceway system depends on the species, and particularly on the size of the species. For trout, stocking rates of 30 to 50 kg/m 3 are normal at the end of a rearing cycle, while for marine species, such as sea bass and sea bream, the achievable load is lower, between 15 and 20 kg/m 3.
Ammonia solution, also known as ammonia water, ammonium hydroxide, ammoniacal liquor, ammonia liquor, aqua ammonia, aqueous ammonia, or (inaccurately) ammonia, is a solution of ammonia in water. It can be denoted by the symbols NH 3 (aq). Although the name ammonium hydroxide suggests a salt with the composition [NH + 4][OH −
Accumulation of toxic ammonia from decomposing wastes is the largest cause of fish mortality in new, poorly maintained, or overloaded aquariums. [7] In the artificial environment of the aquarium, the nitrogen cycle effectively ends with the production of nitrates.