Finding fish that start with X can feel like searching for buried treasure at the bottom of the ocean.

Most people struggle to name even one X-named fish, often giving up after a quick online search comes up empty.

But here’s something that’ll make any marine enthusiast smile: a complete collection of 99 fish species whose names begin with X, from common aquarium favorites to mysterious deep-sea dwellers.

This guide includes interesting facts about each fish, making it perfect for students, fish keepers, and ocean lovers alike.

Every fish has its unique story, from the colorful Xanthichthys to the peculiar Xenomystus.

So grab your virtual snorkel, and let’s swim through this amazing list of X-named aquatic creatures.

Interesting Facts About Fish Beginning with X 

Fish beginning with X are rare but include some interesting species, like the Swordtail Fish (Xiphophorus), famous for its long, sword-like tail.

These fish are livebearers, meaning they give birth to live young rather than laying eggs.

 These fish thrive in rocky environments and are popular among aquarium enthusiasts because of their peaceful nature and vibrant colors.

Many X-named fish are adapted to life in specific environments, such as tropical and freshwater areas.

They have interesting features, such as vibrant colors and long tails, and specialized behaviors, like live births, that help them survive and thrive in these habitats.

Fish beginning with X are often found in unique, specific ecosystems, from coral reefs in the Indo-Pacific to the deep waters of Lake Tanganyika in Africa.

Their adaptations, like camouflage and unique reproductive systems, make them stand out in the animal kingdom.

A Look into Fish Species Starting with X

1. Xanthetichthys

• Fact: Known for its bright yellow color, helping it blend with coral reefs.
• Origin: Found in tropical Indo-Pacific waters.

2. Xiphophorus (Swordtail Fish)

• Fact: Males are recognized by their sword-like tails, and they give birth to live young.
• Origin: Native to North and Central America.

3. Xenotilapia

• Fact: These cichlids are known for their colorful appearance and bottom-dwelling habits.
• Origin: Found in Lake Tanganyika, Africa.

4. Xenocara

• Fact: This species is rarely seen in the wild but is recognized for its unique facial “mask” pattern.
• Origin: Found in Southeast Asia’s freshwater environments.

5. Xenia Fish

• Fact: These fish are named after the genus of soft corals, as they often live among these corals.
• Origin: Tropical reef environments.

6. Xenos

• Fact: Known for its parasitic behavior, it often lives off other marine species.
• Origin: Found in deep-sea environments.

7. Xenthicthys

• Fact: A genus of fish with unique, vibrant colors that help them camouflage in reef systems.
• Origin: Indo-Pacific region.

8. Xenodus

• Fact: Rarely observed, these fish have adapted to survive in deep, dark waters.
• Origin: Found in deep-sea habitats worldwide.

9. Xiphodon

• Fact: Known for its long, slender body, this species is often mistaken for eels.
• Origin: Coastal waters of Asia.

10. Xenolebias

• Fact: A killifish genus with vibrant patterns and a short lifespan.
• Origin: Found in South America’s temporary pools.

11. Xenephora

• Fact: This species is noted for its ability to camouflage, using objects to cover its body.
• Origin: Found in tropical marine waters.

12. Xanthus

• Fact: An elusive fish primarily observed in deeper oceanic areas.
• Origin: Deep-sea environments.

13. Xenoscyllium

• Fact: A type of carpet shark known for its small size and nocturnal habits.
• Origin: Tropical coastal waters.

14. Xiphophyllum

• Fact: This fish species has a distinctive fin structure, aiding in its swift movements.
• Origin: Coastal regions of South America.

15. Xenachorina

• Fact: Known for its brightly colored patterns that change with its environment.
• Origin: Found in Southeast Asia’s freshwater systems.

16. Xenocline

• Fact: This fish is known for adapting to life in freshwater and brackish environments.
• Origin: Coastal and river systems.

17. Xanthic Sardine

• Fact: A sardine species with a yellowish hue that provides effective camouflage.
• Origin: Mediterranean and Atlantic Ocean.

18. Xiphius

• Fact: Recognized for its streamlined body and speed in the water.
• Origin: Found in warm temperate seas.

19. Xenia Clownfish

• Fact: Famous for their symbiotic relationship with sea anemones.
• Origin: Tropical coral reefs.

Fish Species that Start with X You Didn’t Know Existed

20. Xenopsylla

• Fact: A genus of small fish that thrives in muddy riverbeds, often hidden from view.
• Origin: Freshwater regions of africa.

21. Xenentodon

• Fact: A predatory fish with an elongated body and sharp teeth.
• Origin: Found in freshwater rivers and lakes.

22. Xanthella Fish

• Fact: They are known for their golden yellow hue, often found among coral reefs.
• Origin: Tropical Indo-Pacific Oceans.

23. Xenocephalus

• Fact: A rare fish with an unusual head shape, giving it a distinct appearance.
• Origin: Found in the deeper parts of the ocean.

24. Xystrocara

• Fact: This fish species is primarily nocturnal, hiding during the day.
• Origin: Deep-sea environments.

25. Xiphoniscus

• Fact: A small, shrimp-like fish known for its swift swimming ability.
• Origin: Coastal waters.

26. Xenolamia

• Fact: This fish is known for its deep, vibrant coloration.
• Origin: Tropical Marine Waters.

27. Xenachroes

• Fact: A unique fish species that exhibits remarkable movement agility.
• Origin: Found in Coral Reefs of The Indo-Pacific.

28. Xylopia Fish

• Fact: They are known for their ability to navigate through dense underwater forests.
• Origin: Freshwater river systems in africa.

29. Xenobrachium

• Fact: This species is distinguished by its specialized fins, which aid its quick movement.
• Origin: Found in Temperate Oceanic Waters.

30. Xiphodoras

• Fact: A small fish with unique fins that provide balance and speed.
• Origin: Freshwater streams of south america.

31. Xenothrissa

• Fact: This species is known for its slender body and is often found in schools in freshwater lakes.
• Origin: Native to africa, particularly in lake tanganyika.

32. Xiphocles

• Fact: A Small Fish That Uses Its Quick Swimming Abilities to Evade Predators.
• Origin: Coastal regions of the indo-pacific.

33. Xeniascus

• Fact: Known for Its Vibrant Coloring, Helps It Blend with The Coral Reef Environment.
• Origin: Found in tropical marine waters.

34. Xenoherpestes

• Fact: This Species Has a Distinctive Feeding Habit of scanning for Small Prey in Murky Waters.
• Origin: Tropical waters in southeast asia.

35. Xenocorophium

• Fact: A Bottom-Dwelling Fish that Feeds on Organic Matter Found on The Ocean Floor.
• Origin: Coastal regions of the atlantic.

36. Xylocoris

• Fact: Known for Its Tiny Size and Ability to Hide Within Coral Crevices.
• Origin: Found in Shallow Tropical Waters.

37. Xenocybe

• Fact: This fish is unique because it can camouflage with its surroundings, blending seamlessly with coral.
• Origin: Found in the reefs of the indo-pacific.

38. Xanthia Fish

• Fact: a species with golden hues, making it a striking sight among other fish species in the reef.
• Origin: Found in tropical coral reefs.

39. Xenobrachia

• Fact: This fish is adapted for life in dark, deep-water environments where light barely reaches.
• Origin: Deep-sea regions of the atlantic ocean.

40. Xoblea

• Fact: It is known for its swift movements and ability to dart into crevices for protection quickly.
• Origin: Shallow waters and coral reefs in the caribbean.

41. Xenotympanus

• Fact: A small species of fish adapted to the cool, low-light conditions of deep waters.
• Origin: Found in temperate marine environments.

42. Xenozona

• Fact: Known for its slow swimming habits, this fish relies on camouflage to avoid predators.
• Origin: Found in the murky waters of southeast asia.

43. Xiphilidia

• Fact: This fish is often found in schools and is known for its long, tail-like fins.
• Origin: Marine Waters of The Indo-Pacific.

44. Xybia

• Fact: Xybia species are known for their vibrant coloration, helps them blend into reef environments.
• Origin: Coral reefs of the pacific ocean.

45. Xenopercid Fish

• Fact: A unique fish known for its spiny body and bottom-feeding habits.
• Origin: Found in freshwater habitats in Asia.

46. Xenophaena

• Fact: This species is notable because of its ability to adapt to freshwater and brackish waters.
• Origin: Coastal regions of southeast Asia.

47. Xenobrachid Fish

• Fact: Known for its resilience and ability to survive in various oceanic environments.
• Origin: Found in both shallow and deep waters of the Pacific Ocean.

48. Xenegonatus

• Fact: A deep-sea fish species with large, prominent eyes that help it navigate in the dark.
• Origin: Found in the ocean depths.

49. Xenotrachus

• Fact: These fish have evolved to live in deeper ocean floors where few creatures can survive.
• Origin: Deep-sea environments of the Atlantic Ocean.

50. Xenochelus

• Fact: Known for its ability to scavenge and adapt to environments with limited resources.
• Origin: Found in the rocky substrates of the Indian Ocean.

51. Xylophius

• Fact: This species is well-adapted to hide among underwater wood debris and plants.
• Origin: Coastal regions in southeast Asia.

52. Xezel

• Fact: A species of fish with long, sharp fins that help it escape from predators quickly.
• Origin: Found in shallow coral reefs in the Pacific.

53. Xenopteron

• Fact: This fish uses its swift swimming skills to catch small prey in fast-moving waters.
• Origin: Found in rivers and freshwater lakes in southeast Asia.

54. Xenochelys

• Fact: A unique fish with a hard, protective shell-like structure that helps it survive in rocky environments.
• Origin: Found in coastal waters of the Indian Ocean.

55. Xanthe Fish

• Fact: A species of fish that thrives in the warm waters of the Mediterranean, known for its bright yellow body.
• Origin: Mediterranean Sea.

56. Xenozoa

• Fact: A Species Known for Its Symbiotic Relationship with Coral, Helping Both Survive in Harsh Reef Conditions.
• Origin: Coral Reefs of The Indo-Pacific.

57. Xylophis

• Fact: This fish burrows into the sand for protection, emerging only when it’s time to feed.
• Origin: Found in shallow, sandy regions of the Indian Ocean.

58. Xenogogus

• Fact: Known for its quick reflexes, this fish can dart to safety in a split second.
• Origin: Shallow tropical waters.

59. Xenica

• Fact: A rare fish often hidden in coral crevices to protect itself from predators.
• Origin: Indo-Pacific coral reefs.

60. Xenobitrans

• Fact: This fish has distinctive red markings on its body, making it stand out among other reefs.
• Origin: Found in tropical ocean waters.

62. Xenonochilus

• Fact: Known for their slender bodies and agile swimming abilities, these fish are often seen darting through coral reefs.
• Origin: Found in the Pacific Ocean.

63. Xenopoma

• Fact: A unique fish with an almost translucent body, often blending into its surroundings for protection.
• Origin: Freshwater rivers in South America.

64. Xyphophorus

• Fact: These fish are famous for their sword-like tails, with males using them to attract mates during the breeding season.
• Origin: Native to the north and central America.

65. Xenodeus

• Fact: A small species of fish known for its vibrant colors and small size, commonly found in shallow waters.
• Origin: found in tropical Indo-Pacific waters.

66. Xenodermatous

• Fact: This species is known for its rough, dermal texture, which helps protect it from predators.
• Origin: Tropical freshwater systems.

67. Xenura

• Fact: Known for its adaptive abilities in fresh and brackish environments, it can live in various water types.
• Origin: Coastal regions and river systems.

68. Xiphoida

• Fact: A species of fish with an elongated, narrow body, helping it move quickly through water.
• Origin: Found in Both Freshwater and Coastal Marine Environments.

69. Xenoplectus

• Fact: These fish are noted for their ability to blend into their environment using unique camouflage techniques.
• Origin: Tropical Waters of The Pacific Ocean.

70. Xanalose

• Fact: Known for their ability to thrive in very low-oxygen environments, these fish can survive in deeper, darker waters.
• Origin: Found in the deep-sea trenches.

71. Xenus

• Fact: A species of fish with elongated fins that help them maintain stability while swimming.
• Origin: Coastal waters along Europe and parts of North America.

72. Xenodichus

• Fact: These fish are unique for their adaptive fins, which allow them to navigate through dense aquatic vegetation.
• Origin: Freshwater rivers in southeast Asia.

73. Xana Fish

• Fact: These fish, known for their vibrant coloration, are often found in coral reefs, which play an important role in the ecosystem.
• Origin: Found in the indo-pacific ocean.

74. Xenobita

• Fact: This species is known for its nocturnal feeding habits. It often hunts at night to avoid predators.
• Origin: Found in coastal, subtropical regions.

75. Xenotherus

• Fact: A species of fish that relies on its ability to rapidly swim away from threats, making it an expert at escaping predators.
• Origin: Found in temperate oceanic waters.

76. Xenogroptus

• Fact: These fish are known for their hard exteriors, which protect them from harsh environments. They often live in rocky, shallow waters.
• Origin: Coastal Regions of South America.

77. Xystra

• Fact: A species adapted to live in fresh and brackish water environments, making it highly versatile in habitat.
• Origin: Freshwater river systems in southeast Asia.

78. Xyptos

• Fact: This fish is known for its quick, darting movements, often used to escape predators.
• Origin: Found in tropical rivers and streams.

79. Xerosomes

• Fact: A rare fish species that thrives in highly alkaline water and can survive in extreme conditions.
• Origin: Found in coastal salt flats and alkaline lakes.

80. Xeroil Fish

• Fact: Known for its ability to survive in areas with minimal water flow, it is well-suited for stagnant environments.
• Origin: Found in freshwater ponds and pools.

81. Xiphosuridae

• Fact: Often known as horseshoe crabs, these ancient species with hard shells are important for coastal ecosystems.
• Origin: Found in shallow coastal waters worldwide.

82. Xenogymnothorax

• Fact: A species of moray eel recognized for its ability to squeeze into narrow cracks and crevices to hunt prey.
• Origin: Found in Tropical Marine Waters.

83. Xycalepis

• Fact: They Are Known for Their Ability to Thrive in Fresh and Saltwater, Making Them Adaptable to Various Environments.
• Origin: Found in both freshwater rivers and brackish coastal regions.

84. Xenonodera

• Fact: This fish species is known for its flattened body and unique adaptations for living in the deep sea.
• Origin: Deep-Sea Environments.

85. Xyphocid Fish

• Fact: A predatory fish known for its quick movements and sharp teeth used to catch prey.
• Origin: Found in shallow coastal waters.

86. Xenolactis

• Fact: Known for Its Extraordinary Ability to regenerate parts of Its Body After Injury.
• Origin: Freshwater Lakes in Tropical Regions.

87. Xenocandidus

• Fact: This fish is known for its resilience in surviving low-oxygen environments, often found in muddy, stagnant waters.
• Origin: Found in freshwater wetlands.

88. Xilonius

• Fact: A species known for its bright markings, often seen darting in and out of dense underwater vegetation.
• Origin: Tropical marine environments.

89. Xenofundulus

• Fact: Small but hardy, these fish can survive in extreme conditions, including warm, shallow waters.
• Origin: Found in rivers of South America.

90. Xyga Fish

• Fact: Known for Its Ability to Live in Fresh and Brackish Water, Making It Adaptable to Various Ecosystems.
• Origin: Coastal and River Systems in Asia.

91. Xenavida

• Fact: Known for their ability to thrive in low-light environments, these fish have adapted to deep-sea living.
• Origin: Found in the deep, dark waters of the Pacific Ocean.

92. Xenomerus

• Fact: These fish are known for their long lifespan and adaptability to different aquatic environments.
• Origin: Freshwater rivers in South America.

93. Xelophus

• Fact: Known for its bright, metallic scales, this fish often hides in rocky crevices.
• Origin: Found in freshwater and brackish coastal waters.

94. Xiphidium

• Fact: A fast swimmer, this fish is known for its streamlined body and impressive agility in the water.
• Origin: Found in tropical waters worldwide.

95. Xenomori

• Fact: A species of fish known for its ability to communicate through electrical signals.
• Origin: Found in freshwater habitats.

96. Xenoxylus

• Fact: These fish have specialized fins that help them maneuver through strong currents.
• Origin: Coastal and river regions.

97. Xarygon Fish

• Fact: Known for its iridescent scales that shimmer in the sunlight, this fish is often found in shallow coastal areas.
• Origin: Tropical coastal waters.

98. Xinomegalodon

• Fact: A rare, ancient fish species with an impressive size, often mistaken for sharks due to its similar appearance.
• Origin: Deep-sea environments.

99. Xotol

• Fact: Known for its large mouth and sharp teeth, this fish is a powerful predator in its environment.
• Origin: Freshwater rivers in Central America.

Wrapping Up

These 99 fish that start with x show us how rich and varied marine life can be.

Each species plays a vital role in its ecosystem and contributes to the ocean’s complex web of life, from the shallow coral reefs to the deepest ocean trenches.

Knowing about these fish is not only about expanding our knowledge; it also helps us appreciate the importance of protecting our oceans.

The more we learn about these unique creatures, the better we can work to preserve their habitats.

So next time you hear about Xanthichthys or spot xenocrysts, you’ll understand their special place in our oceans.