Fish True or False

Guess whether these statements about fish are true or false.

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Last updated: February 13, 2022

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First submitted	October 16, 2021
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1. The Greenland shark is the only known species of fish capable of living for over 200 years.

Rougheye rockfish, warty oreos and orange roughy are all capable of living for over 200 years.

True

False

2. The giant moray is the heaviest species of eel.

The giant moray can weigh as much as 36 kg, but the European conger has a maximum weight of around 72 kg.

True

False

3. The largest vertebrate animal family is a fish family.

The family Cyprinidae, which includes carps, true minnows and related fishes, contains around 3,000 species (1,270 extant species).

True

False

4. There is a species of fish that creates complex shapes out of sand.

Male white-spotted pufferfish create large, geometric circles on the seabed to attract females.

True

False

5. Mudskippers are the only extant amphibious fish.

Lungfish and bichirs can breathe air and as such can survive outside of water for some time, while some species of eel, catfish and snakehead are capable of travelling on land. The Pacific leaping blenny can survive out of the water on moist surfaces for several hours, and leap between the rocks they live on.

True

False

6. Fish have been found living close to the Chernobyl power plant.

Large wels catfish live in the cooling ponds and channels close to the power plant, where they are at the top of the food chain.

True

False

7. Besides other great whites, the great white shark has no known natural predators.

Killer whales occasionally kill great whites and eat their livers.

True

False

8. Some fish lack haemoglobin.

Adult crocodile icefish, which live in the Southern Ocean around Antarctica, are the only known vertebrates to lack haemoglobin.

True

False

9. Piranhas are omnivores.

In addition to other animals, piranhas feed on fruit, seeds, leaves and detritus.

True

False

10. Coelacanths can be found in the Atlantic.

The West Indian Ocean coelacanth lives off the east coast of Africa, while the Indonesian coelacanth lives off Sulawesi and New Guinea.

True

False

11. There are only two extant species of filter-feeding sharks.

There are three: the whale shark, the basking shark and the megamouth shark.

True

False

12. Some species of lamprey migrate from saltwater to freshwater to spawn.

Out of the eighteen species of carnivorous lamprey, nine travel from saltwater to freshwater to breed.

True

False

13. There are fish that fire water droplets to catch their prey.

Archerfish have specialised mouths, allowing them to bring down insects and other prey up to three metres above the water's surface. Most of the time, the fish end up hitting their targets.

True

False

14. After sailfish and marlin, tuna are the fastest fish in the sea.

Atlantic bluefin tuna can swin at up to 46 miles per hour, but wahoo (which are related to tuna) can reach speeds of up to 60 miles per hour. Sailfish can swim at speeds of at least 68 miles per hour.

True

False

15. Some fish are immune to jellyfish venom.

These fish live among the tentacles of jellyfish. They attract other fish that want to feed on them, yet are protected by the jellyfish; they then share the remains with the jellyfish. Ten species of fish live amongst the tentacles of a single species of jellyfish, the cannonball jellyfish, while the longnose spider crab lives inside its bell.

True

False

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