Yellow seahorse
Hippocampus kuda
Also known as Spotted seahorse, Common seahorse, Estuary seahorse, Kuda seahorse
Care at a glance
- Temperature
- 72–81°F (22–27°C)
- pH
- 8.0–8.4
- Adult size
- 7.9 in (20 cm)
- Minimum tank
- 40 gal (150 L)
- Temperament
- Peaceful
- Social behavior
- Social
- Swim level
- Middle
- Difficulty
- Difficult
- Breeding
- Medium
- Rarity
- Common
- Reef safe
- Reef safe with caution
- Origin
- Native to the Indo-Pacific, living in estuaries, seagrass and mangroves, and tolerant of slightly brackish coastal water.
- Family
- Syngnathidae
Overview
Because it grows larger, give the yellow seahorse a tall species tank of at least 150 litres with gentle flow and sturdy hitching posts, at 22 to 27 C and pH 8.0 to 8.4. Keep captive-bred fish in pairs or groups and feed enriched frozen mysis shrimp once or twice a day. Only pair it with slow, gentle tankmates and keep it away from stinging anemones, aggressive corals and fast feeders. Watch water quality closely, as seahorses are sensitive to bacterial infections.
In the wild
The yellow seahorse is a larger tropical seahorse that often shows a golden yellow body, though it also comes in brown, black and blotched patterns. It has a smooth, rounded head and a stout body, and grips onto plants and decor with its tail. It is one of the most widely kept and widely farmed seahorses.
Good to know
Hippocampus kuda reaches around 20 cm and is one of the most farmed seahorse species, so tank-raised stock is common. It naturally lives in estuaries and can handle slightly reduced salinity, though it is kept in full-strength saltwater in the hobby. Males brood eggs in a pouch and give birth to hundreds of miniature seahorses.
Did you know
The yellow seahorse naturally lives in river mouths and estuaries and can tolerate brackish water, which is unusual for a fish kept in reef-style saltwater aquariums.
Where to buy
Some links may not be the exact species or variety.
…or ask your local fish store.
Appears in
Keeping Yellow seahorse?
Track water tests, reminders and stocking fit.
Related species

Lined seahorse
Hippocampus erectus7.1 in (18 cm)29 gal (110 L)68–79°F (20–26°C)
Brazilian seahorse
Hippocampus reidi6.7 in (17 cm)29 gal (110 L)72–81°F (22–27°C)
Dwarf seahorse
Hippocampus zosterae1.4 in (3.5 cm)5 gal (20 L)68–79°F (20–26°C)
Bluestripe pipefish
Doryrhamphus excisus2.8 in (7 cm)26 gal (100 L)75–81°F (24–27°C)
Banded pipefish
Dunckerocampus dactyliophorus7.5 in (19 cm)53 gal (200 L)75–81°F (24–27°C)
Copperband Butterflyfish
Chelmon rostratus7.9 in (20 cm)79 gal (300 L)75–81°F (24–27°C)
