Depending on the locality, feeder fish may include: Several fast-growing and hardy species are commonly sold and used as feeder fish. A disadvantage of using feeder fish, particularly goldfish, is that they do not accurately simulate what a tropical fish might eat in the wild. When bred and held in an overcrowded or otherwise sub-optimal environment, they may also carry bacterial infections and parasites, which can be passed along to fish that consume them. Some of the species used as feeder fish ( goldfish and rosy red minnows) contain high quantities of thiaminase, an enzyme that destroys thiamine (vitamin B 1) and when fed in large quantities can cause nutritional imbalances. Most predatory species that eat live fish can also be weaned onto dead alternatives. ![]() Some aquarists view the use of feeder fish as cruel and unnecessary, often arguing that once the feeder fish is introduced into a small tank, it has no chance to escape, and such a situation cannot be considered "natural". Some animal keepers enjoy watching the hunting and eating techniques involved when predation occurs.ĭisadvantages of using feeder fish Other animal keepers believe that feeder fish are particularly nutritious, being what one would expect their pets would eat in the wild some others view feeder fish as a stimulating treat that encourages predatory animals to exercise their natural hunting behaviours. In some cases, species of predatory animals, typically large fish such as catfish and cichlids, but sometimes also animals such as freshwater turtles, are provided with feeder fish, because they accept them more readily than alternatives. This makes it easy for fish farmers, retailers, and hobbyists to maintain large populations of these fish that can be sold at a much more affordable price than the more ornamental fish that require better conditions. Typically, these species are tolerant of overcrowding and have a high fecundity and rapid growth rate. ![]() The species of fish usually sold as feeder fish are invariably some of the easiest fish for fishkeepers to rear and breed, such as common goldfish, guppies and fathead minnow.
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