Feeder fish

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Feeder fish is the common name for certain types of inexpensive fish commonly fed as live prey to captive animals, such as sharks, turtles and some other predatory fishes that inhabit fresh, brackish or salt water, such as oscars, Gar, and Rays.

Advantages of using feeder fish[edit]

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 and guppies. Typically, these species are tolerant of overcrowding and have a high fecundity and rapid growth rate. 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.

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. Other animal keepers believe that feeder fish are particularly nutritious[citation needed], 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. Some animal keepers enjoy watching the hunting and eating techniques involved when predation occurs.

Disadvantages of using feeder fish[edit]

Some aquarists view the use of feeder fish as cruel and unnecessary,[citation needed] 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". Most predatory species that eat live fish can also be weaned onto dead alternatives. Some of the species used as feeder fish (goldfish and rosy red minnows) contain high quantities of thiaminase, an enzyme that destroys thiamine (vitamin B1) and when fed in large quantities can cause nutritional imbalances. 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.[1][2] A disadvantage of using feeder fish, particularly goldfish, is that they do not accurately simulate what a tropical fish might eat in the wild.[citation needed]

Species use[edit]

Several fast-growing and hardy species are commonly sold and used as feeder fish. Depending on the locality, feeder fish may include: 

Opinions within the hobby[edit]

Although the use of feeder fish is fairly common in the United States, in the United Kingdom it is much less commonplace, with aquarists and hobby magazines in Britain generally rejecting the use of feeder fish as being unnecessary and likely to cause health problems.[2][3]

See also[edit]


  1. ^ Neale Monks. "Feeder Fish Mini-FAQ". Retrieved 2006-11-30.
  2. ^ a b Matt Clarke. "Stuff you need to know about feeding". Archived from the original on March 30, 2006. Retrieved 2006-11-30.
  3. ^ Matt Clarke. "Boy gets patent for live fish feeder". Archived from the original on 2015-01-22. Retrieved 2006-11-30.

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