
Lined seahorse
Hippocampus erectus
It stands upright, wraps its tail on a branch and stays there for hours.
The Lined seahorse (Hippocampus erectus) is a subtropical marine fish of the family Syngnathidae. It lives on and around reefs, between 0 and 100 m deep. Adults grow to about 15 cm; the largest on record measured 17.8 cm (standard length). The IUCN Red List rates it Vulnerable. In the aquarium it needs a tank at least 75 cm long and water at 22–25 °C.
- Size
- 15 cm
- Smallest tank
- 75 cm
- Temperature
- 22–25 °C
- Care
- Demanding
In the aquarium
Temperature22–25 °C
pH7.8–8.5
- Temperament
- Peaceful
- Diet
- Carnivore
- Activity
- Calm
- Water layer
- Mid water
- Group
- Lives on its own
- Coral
- Nips corals
These values are compiled from real species data, and the LumaReef simulation is built to keep them true to life.
Which tank it fits
- Nano60 cm · 65 litresToo small
- Standard90 cm · 180 litres15 of them
- Wide120 cm · 300 litres25 of them
- Living room180 cm · 650 litres54 of them
- Showcase250 cm · 1,200 litres100 of them
- Gallery300 cm · 1,440 litres120 of them
Who it lives with
Gets along5 species
Caution85 species
Narrow shared temperature range
- Copperband butterflyfish
- Longnose butterflyfish
- Kole tang
- Pyramid butterflyfish
- Diamond watchman goby
- Tomato clownfish
- Yellow tang
- Scopas tang
- Convict tang
- Lemonpeel angelfish
- Bicolor angelfish
- Regal angelfish
- Melanurus wrasse
- Scott's fairy wrasse
- Exquisite fairy wrasse
- Lawnmower blenny
- Midas blenny
- Starry blenny
- Raccoon butterflyfish
- Pearlscale butterflyfish
- Longnose hawkfish
- Dwarf lionfish
- Aiptasia-eating filefish
- Clarkii clownfish
- Yellow coris wrasse
- Leopard wrasse
- Valentini puffer
- Foxface rabbitfish
- Flame angelfish
- Coral beauty angelfish
- Potter's angelfish
- Radiant wrasse
- Mystery wrasse
- Cleaner wrasse
- Bicolor blenny
- Lyretail anthias
- Threadfin butterflyfish
- Yellowhead jawfish
- Pink skunk clownfish
- Rusty angelfish
- Flame wrasse
- Randall's shrimpgoby
- Canary blenny
- Striped fang blenny
- Dispar anthias
- Neon dottyback
- Bartlett's anthias
- Clownfish
- Blue tang
- Yellow watchman goby
- Fire goby
- Flame hawkfish
- Orchid dottyback
- Banggai cardinalfish
- Pajama cardinalfish
- Percula clownfish
- Green chromis
- Cherub angelfish
- Sixline wrasse
- Carpenter's flasher wrasse
- Purple firefish
- Court jester goby
- Royal gramma
- Falco hawkfish
- Scooter dragonet
- Yellowstriped cardinalfish
- Yellowtail damselfish
- Azure damselfish
- Tailspot blenny
- Mandarinfish
- Talbot's damselfish
- Springer's damselfish
- Yasha goby
- High-fin shrimpgoby
- Engineer goby
- Ruby red dragonet
- Green clown goby
- Sailfin tang
- Naso tang
- French angelfish
- Porcupine puffer
- Volitans lionfish
- Niger triggerfish
- Yellow boxfish
- Longhorn cowfish
Not together9 species
In the wild
- Water type
- Marine
- Climate zone
- Subtropical
- Habitat
- Coral and rocky reefs
- Largest on record
- 17.8 cmstandard length, tail fin excluded
- Aquarium trade
- Traded commercially
Depth
surface
0 m100 m
Conservation status
Classification
- OrderSyngnathiformes
- FamilySyngnathidae
- GenusHippocampus
- SpeciesHippocampus erectus
- Described byPerry, 1810
In other languages
- English
- Northern Seahorse
- German
- Linienseepferdchen
- Spanish
- Caballito estriado de mar
- French
- hippocampe rayé
- Italian
- Cavalluccio striato
Quick answers
- Lined seahorse size: how big does it get?
- Adults reach about 15 cm. The largest on record measured 17.8 cm (standard length).
- Lined seahorse tank size: what is the minimum?
- A tank at least 75 cm long. In LumaReef that is the Standard tank or larger.
- Lined seahorse water parameters: what does it need?
- Temperature 22–25 °C, pH 7.8–8.5.
- Lined seahorse tank mates: what can it live with?
- It gets along with 5 of the 99 reef species in the catalogue, such as Squarespot anthias, Blackcap basslet, and Swissguard basslet.
- Lined seahorse: alone or in a group?
- It can be kept on its own.
- Lined seahorse and corals: is it reef safe?
- No, it may nip at corals.
- Lined seahorse depth: how deep does it live?
- In the wild, 0 to 100 m down.
- Lined seahorse: is it endangered?
- The IUCN Red List rates it Vulnerable.
Similar species
Sources
Lined seahorse: compiled from these references.









