Fish Used for Entertainment


Fish are held captive in aquariums and as pets. Globally, there are more than two million public aquariums and homes that hold fish captive. In the US, between 10 to 13% of households keep fish as pets, with an average of 8 to 9 fish per household. The majority of captive fish are in the US, followed by Europe and Japan. There are more than 1,800 species of fish in the aquarium trade (about half are saltwater species, the other half are freshwater species). The majority of fishes kept as pets are freshwater fish.

fish are captured from the wild

There are only a few saltwater species that successfully breed in captivity on a commercial scale, so the vast majority of saltwater fish are taken from the wild. Fish are mostly taken from reefs in the Coral Triangle Region (the waters off Indonesia, Malaysia, Papua New Guinea, the Philippines, Solomon Islands and Timor-Leste). Twenty to 24 million fish are captured from the oceans every year to be sold in the aquarium trade.

capture is cruel

Sodium cyanide, a highly toxic compound that stuns fish by suffocating them, is widely used in their capture. After being squirted with cyanide, fish suffer “severe gasping, followed by loss of balance and a complete loss of all respiratory activity.” There is a 75% mortality rate for fish who are sprayed. 50% of fish in the surrounding area, but not sprayed directly, are also killed by it. Eleven million wild-caught fish are imported every year to the US, and six to ten million of those fish are caught using cyanide.

In just Philippines alone, five metric tons of cyanide are used to capture fish every year. Cyanide use also kills the coral reef. For each live fish caught with cyanide, it destroys about a square yard of coral. Even in low doses, cyanide can bleach coral. The ecosystem collapses without coral, as it provides animals with food, shelter, and breeding grounds.

Fish are also caught using nets, which scare and injure them, as well as damage the coral reef. Many fish who are captured are raised from deep water too quickly. These fish suffer decompression injuries, such as parts of their gut being forced out through their mouths and anuses, their swim bladders bursting, and their eyes bulging out. Some collectors bring fish to the surface immediately and pierce the fish’s inflated swim bladder with a needle to keep it from bursting.

In the US, the Lacey Act bans the importation of wild animals caught in violation of another country’s law. (The Philippines, Sri Lanka, and Indonesia ban the use of cyanide to catch fish). But currently, US agencies do not test imported fish for traces of cyanide.

suffering during transport

Transport is very stressful to fish. The major cause of death when transporting fish is stress-induced deaths. After collection, fish are put in plastic containers or bags with very little water. Fish barely have room to move. Aggressive fish may be placed in bags which they cannot see through. Before being shipped to a wholesale facility, fish are usually starved for 24 to 48 hours to prevent the small amount of water from being contaminated with the fishes’ excrement. Fishes’ dorsal spines, which can pierce the plastic bag, are often cut off.

The transport process can be days long, even though studies suggest that travel time should be kept under 40 hours. When fish get to their destination, they are taken out of the bags and quarantined.  When fish are moved around at the wholesale facility, they are taken out of water, which is very stressful to fish as they cannot breathe as well in air as in water. They are moved using nets and other implements which cause them injury. Water temperature, quality, and oxygen levels may not be similar to their natural habitat.

breeding in captivity

The majority of freshwater fish in the aquarium trade, like goldfish, guppies, angelfish, and koi, can be bred in captivity. Many times during their lives, like when their eggs are taken, they are moved into a different tank, or moved to be sold, they are netted, taken out of water, and handled roughly. One facility alone sells two million captive bred fish every year. It is estimated that more than 250 million goldfish are bred every year.

Koi, CC Bernard Spragg NZ

Wild Animals Deserve Freedom

Fish are held captive in conditions that cannot adequately mimic their natural habitat. There are millions to billions of animals held captive in aquariums in the US that live in inadequate environments that do not meet their needs. Many tanks don’t regulate water temperature as needed or provide environmental enrichment. Fish suffer from disease outbreaks. Tanks that are too small (or contain too many animals) lead to lack of oxygen and developmental deformities in fish.

millions of fish die to stock aquariums

Small fishes can live in captivity for three to five years, and medium to large fishes can live more than ten years. 80% of all wild-caught fish die before they are sold. Those that survive long enough to be bought by hobbyists or people who consider fish to be pets are extremely likely to be dead in under a year. It is estimated that 98% of all wild-caught fish die within a year. Many die within days of being purchased.


Revealing the appetite of the marine aquarium fish trade: the volume and biodiversity of fish imported into the United States by A. Rhyne et al. in PLoS One Vol. 7(5) (2012).

From ocean to aquarium: the global trade in marine ornamental species by Colette Wabnitz et al., UNEP World Conservation Monitoring Centre (2003).

Effects of cyanide exposure on Dascyllus aruanus, a tropical marine fish species: lethality, anaesthesia and physiological effects by M. Hanawa et al. in Aquarium Sciences & Conservation Vol. 2(1) (1998).

Proceedings of the International Cyanide Detection Testing Workshop edited by Andrew Bruckner & Glynnis Roberts in Orlando, FL (2008).

The Horrific Way Fish Are Caught for Your Aquarium—With Cyanide by Rachael Bale, National Geographic (2016).

People Are Killing Millions Of Fish Each Year Just To Stock Aquariums by Elizabeth Alberts, The Dodo (2017).

How It’s Made – Aquarium Fish by How Its Made (2016).

Saving Nemo: transforming the marine aquarium Industry by World Wildlife Fund.