Skip to content
Lined seahorse, photographed on a transparent background

ReefIn the marketFishing and the Bazaar onlyMythic10 in the worldSee how many are left

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
Drawn to scale in a 75 cm tank

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
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

Conservation status

Classification

  1. OrderSyngnathiformes
  2. FamilySyngnathidae
  3. GenusHippocampus
  4. SpeciesHippocampus erectus
  5. 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.

All Syngnathidae speciesAll species A–Z

Sources

Lined seahorse: compiled from these references.