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Thorny Seahorse (Hippocampus histrix)

Find Thorny Seahorse across reef-livestock retailers on ReefDock. Compare sources, check known pricing where available, and review care information before you buy.

Thorny Seahorse
Photo: Rickard Zerpe · CC BY-SA 2.0
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Where to buy Thorny Seahorse

ReefDock searches the following reef retailers for this fish. Click through to see the live price.

  • Saltwaterfish

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  • Amazon

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  • Petco

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About Thorny Seahorse

The Thorny Seahorse has a slender, upright body with a curled prehensile tail characteristic of seahorses. It displays prominent thorn-like tubercles (bony protrusions) covering its body, giving it its common name. Coloration ranges from yellowish-brown to reddish-brown, often with darker mottling or banding.

Key facts

Aka
Thorny Seahorse
Min tank size
30 gallons
Reef safety
Reef Safe
Appearance
The Thorny Seahorse has a slender, upright body with a curled prehensile tail characteristic of seahorses. It displays prominent thorn-like tubercles (bony protrusions) covering its body, giving it its common name. Coloration ranges from yellowish-brown to reddish-brown, often with darker mottling or banding.
Temperament
Peaceful
Care Level
Hard
Difficulty Level
Advanced - Requires experienced care due to sensitive nature specific habitat needs or complex dietary requirements. Best for expert aquarists.
Care Requirements
• Minimum 30 gallon tank with dense seagrass or macro algae for anchoring • Temperature range 72–78°F; maintain stable conditions with minimal flow in the holding area • Salinity 1.020–1.025 specific gravity • Feed 2–3 times daily with live copepods, amphipods, and enriched frozen mysis shrimp • Keep with peaceful tank mates only; seahorses are slow feeders and easily stressed by aggressive or fast-moving fish • Provide calm areas with reduced water flow where the seahorse can feed undisturbed
Water Parameters
Temperature: 72-78°F pH: 8.1-8.3 Salinity: 1.02-1.025
Family
Syngnathidae
Feeding Schedule
2-3 times daily
Common Health Issues
Poor feeding in new tanks, gas bubble disease, bacterial infections, parasitic copepods

Research before you buy

ReefDock is the sister app to Reef Trak. Use Reef Trak to research and log fish, keep tank parameters organized, and maintain a complete livestock history. Log this fish on Reef Trak.

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