50 Fish That Start With X: Common And Scientific Names

The underwater world is a realm of astounding diversity and complexity, with over 33,000 known species of fish inhabiting our oceans, rivers, and lakes. This rich variety showcases an array of colors, shapes, and sizes, each species adapted to its unique environmental niche.

Among this vast diversity, fish names range from the commonplace to the exotic, often reflecting unique characteristics or habitats.

In this exploration, we delve into a fascinating aspect of ichthyology – the naming of fish species. Specifically, we focus on those whose names begin with the letter X. 

Common Fish Names That Start With X

When it comes to common fish names starting with ‘X’, the list is surprisingly short.

X-ray Tetra (Pristella maxillaris)

Native to the Amazon River’s coastal waters in Brazil, the X-ray Tetra is renowned for its almost transparent body, through which its spine and internal organs can be seen, resembling an X-ray image. This unique adaptation is not just for show; it offers the X-ray Tetra a survival advantage in its natural habitat.

The X-ray Tetra is a small fish, typically growing to about 1.5 to 2.5 inches in length. Its body is predominantly transparent, with a faint golden hue and a sprinkle of black and white on its tail and fins. One of the most striking features of the X-ray Tetra is its spinal column, which is clearly visible through its skin.

In terms of behavior, X-ray Tetras are schooling fish and thrive best in groups. They are known for their peaceful nature, making them ideal residents in a community aquarium. When it comes to diet, they are not fussy eaters and will readily accept a variety of foods, including flakes, small pellets, and live or frozen foods like brine shrimp.

Xantic Sargo (Anisotremus davidsonii)

A sub-type of the Sargo fish (depicted above), the Xantic Sargo is a fish species known for its distinctive appearance and behavior. It is primarily found in the eastern Pacific Ocean, ranging from California to Peru.

The Xantic Sargo is recognized for its stout body, silver color with a bronze or brown tinge, and its nocturnal feeding habits. Unlike the Sargo above, Xantic Sargo possess only one distinctive silver stripe across their body.

This species typically dwells in rocky and reef areas, preferring deeper waters. It’s known for its diet that consists mainly of kelp and other underwater vegetation. Unlike Sargo, Xantic Sargo are not an aggressive species.

Xanthogramma Sandperch (Parapercis hexophtalma)

Also known as Spotted grubfish or Weever fish, the Xanthogramma Sandperch is a marine fish found in the Indo-Pacific region. This species is distinguished by its elongated body and the presence of unique, hexagonal patterns on its skin, which contribute to its common name.

The Xanthogramma Sandperch is usually found in sandy or rubble substrates in coastal areas and is known for its ability to blend into its surroundings, a trait that aids in hunting small invertebrates and evading predators.

Scientific Fish Names That Start With X

Luckily, when it comes to scientific fish names that start with the letter X, there is much more variety. Here’s our selection of the most notable species: 

Most Popular Fish That Starts With X: Xiphias gladius (Swordfish)

The Swordfish (Xiphias gladius), commonly known as broadbills in some regions, is a notable species in the ocean for several reasons.

Interesting Facts About the Swordfish:

• They thrive in temperatures between 64 to 71°F (18-22°C) but can also be found in waters as cold as 41°F (5°C) and as warm as 80°F (27°C).
• Swordfish possess a unique physiological feature known as a “brain heater,” which allows them to maintain essential sensory functions in cold water depths.
• They are known for their incredible speed, making them formidable hunters in the ocean.
• Adult swordfish lack scales and teeth, a distinctive feature among fish.
• Their diet is varied, including pelagic and demersal fishes, along with squids and other cephalopods.
• The iconic “sword” or bill of the swordfish is used more for slashing at prey rather than spearing, aiding in their hunting strategy.
• Despite being solitary by nature, they play a crucial role in global fisheries, with active fishing in both tropical and temperate waters.

Notable Genus of Fish That Start With X

Xenotilapia

This genus is part of the family Cichlidae, commonly known as cichlids. These fish are primarily found in African lakes, notably Lake Tanganyika.

The genus Xenotilapia is known for its diverse species, which display a variety of behaviors and adaptations suitable for different ecological niches within their natural habitat.

Notable species of the Xenotilapia genus include:

1. Xenotilapia flavipinnis
2. Xenotilapia melanogenys
3. Xenotilapia nasus
4. Xenotilapia nigrolabiata 
5. Xenotilapia ornatipinnis
6. Xenotilapia sima

Xenomystax

The Xenomystax genus belongs to the family Congridae, commonly known as conger eels. Congridae is a large family of eels that includes many different genera, among which Xenomystax is one. The species within this genus are typically characterized by their elongated bodies and are found in various marine environments.

Notable species of the Xenomystax genus include:

1. Xenomystax austrinus
2. Xenomystax bidentatus
3. Xenomystax congroides
4. Xenomystax trucidans
5. Xenocypris argentea

Xenocypris

The Xenocypris genus belongs to the family Cyprinidae, which is known for freshwater fish like carps and minnows. Cyprinidae is one of the largest fish families and includes many species that vary widely in size, shape, and ecological niche.

The Xenocypris species are typically found in freshwater habitats in Asia, particularly in China. Some notable specimen include:

1. Xenocypris davidi
2. Xenocypris fangi
3. Xenocypris microlepis
4. Xenocypris yunnanensis

31 Other Fish Species That Start with X

Each of these species, while perhaps less known in the public sphere, contributes uniquely to the biodiversity of aquatic ecosystems around the world.

1. Xanthichthys lima
2. Xenaploactis asperrima
3. Xenaploactis cautes (Rough Velvetfish)
4. Xenentodon cancila (Freshwater Garfish)
5. Xenichthys rupestris
6. Xenichthys xanti (Longfin Salema)
7. Xenisthmus balius
8. Xenisthmus clarus
9. Xenistius californiensis (Salema)
10. Xenistius peruanus
11. Xenobalistes tumidipectoris
12. Xenobarbus loveridgei
13. Xenocharax Spilurus
14. Xenocys jessiae
15. Xenocephalus australiensis
16. Xenochromis hecqui
17. Xenocypris davidi
18. Xenodexia ctenolepis
19. Xenomelaniris brasiliensis
20. Xenomugil thoburni
21. Xenophallus umbratilis
22. Xenophthalmichthys danae
23. Xenopoecilus sarasinorum
24. Xenopterus naritus
25. Xenotoca eiseni (Redtail Splitfin)
26. Xenotoca variata (Variegated Splitfin)
27. Xingu corydoras
28. Xiphophorus hellerii (Green Swordtail)
29. Xiphophorus maculatus (Platyfish)
30. Xiphophorus xiphidium (Swordtail)
31. Xiphophorus monticolus

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