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Entry 605Filed under Breeding

How Big Are Deep-Sea Telescopefish?

Telescopefish are small deep-sea fish: Smithsonian Ocean gives a group-level maximum of 26 cm, while NOAA’s family account reports observed standard-length maxima of 17.7 cm and 22.3 cm for the two species. Standard length excludes the tail fin, so it should not be confused with total length.
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Deep-sea telescopefish are small: Smithsonian Ocean says neither of the two species grows longer than 26 cm (about 10 inches). NOAA’s family account reports maximum observed standard lengths of 177 mm for Gigantura chuni and 223 mm for Gigantura indica. Standard length excludes the tail fin, so these figures are not directly interchangeable with total length.

The name refers to telescopefish’s tubular eyes, not to a giant body. The reported numbers are maximum sizes, not average lengths.

How large is each telescopefish species?

Species Maximum observed standard length Approximate equivalent Measurement note
Gigantura chuni 177 mm 17.7 cm (about 7 inches) Standard length; excludes the caudal fin
Gigantura indica 223 mm 22.3 cm (about 8.8 inches) Standard length; excludes the caudal fin

Thomas L. Jackson’s NOAA-hosted family account gives those species-specific maximum observed standard lengths. Separately, Smithsonian Ocean says neither species grows longer than 26 cm, and FishBase lists a maximum length of 26.0 cm total length for G. indica. Because total length includes the caudal fin and standard length does not, these values describe different measurement conventions.

The concise answer is that telescopefish are no longer than about 26 cm according to Smithsonian Ocean, while the NOAA-hosted account’s observed standard-length maxima are 17.7 cm for G. chuni and 22.3 cm for G. indica.

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Why the measurements are not perfectly comparable

Fish researchers use more than one way to measure a fish:

  • Standard length (SL) runs from the tip of the snout to the base of the tail fin. It leaves out the caudal fin.
  • Total length (TL) runs from the tip of the snout to the farthest end of the tail fin. It includes the caudal fin.

The NOAA-hosted account reports standard lengths, while FishBase’s 26.0 cm figure for G. indica is total length. Smithsonian Ocean’s group-level 26 cm summary does not specify a measurement convention in the cited passage. Treat the figures as sourced size descriptions, not as a precise head-to-tail comparison.

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What is a telescopefish?

“Telescopefish” is the common name for fish in the family Giganturidae. The family contains one genus, Gigantura, and two species:

  • Gigantura chuni
  • Gigantura indica

Smithsonian Ocean describes the adults as elongated, with tubular eyes, ribbon-like tails, silvery coloration, and no scales. The name comes from their remarkable tubular eyes, not an unusually large body.

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Where do telescopefish live?

Smithsonian Ocean and the FAO describe telescopefish as occurring in tropical and subtropical waters worldwide. FishBase reports a depth range of 17–2,100 m for G. indica; that is a reported range for that species, not a universal depth limit for every telescopefish.

The Australian Museum reports that both species occur in Australian waters. Telescopefish are deep-sea fish, and the available source material does not establish a dependable estimate of their global abundance.

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Do telescopefish look different as babies?

Yes. The NOAA-hosted family account notes that telescopefish larvae look very different from the transformed adults. A larval image should not be assumed to show the adult body form.

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Frequently Asked Questions

What is the largest telescopefish?

Smithsonian Ocean gives a group-level maximum of 26 cm (about 10 inches). FishBase lists 26.0 cm total length for Gigantura indica. These are maximum figures, not typical adult lengths.

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How long is a Gigantura indica?

Thomas L. Jackson’s NOAA-hosted family account reports a maximum observed standard length of 223 mm (22.3 cm). FishBase separately lists a maximum total length of 26.0 cm. Standard length excludes the caudal fin; total length includes it.

How many species of telescopefish are there?

The family Giganturidae has one genus, Gigantura, and two species: Gigantura chuni and Gigantura indica.

Are telescopefish giant fish?

No. Smithsonian Ocean says neither species grows longer than 26 cm, so they are small fish despite their striking eyes and name.

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