Saltwater Fish
Lined Seahorse

Species Description…

Scientific Name: Hippocampus erectus
Common Name: Lined Seahorse
Species Group: Seahorse
Habitat: Reef Safe with Caution
Care Level: Advanced
Temperament: Peaceful
Diet Type: Carnivore
Role in Aquarium: Showpiece Fish
Max Fish Length: 4 (inches)
Min Aquarium Size: 30 (gallons)
Native Range: Western Atlantic/Caribbean
Hippocampus erectus - Lined Seahorse

Hippocampus erectus (Lined Seahorse)

Overview

  • Native to the Western Atlantic, ranging from Canada to the Gulf of Mexico and the Caribbean.
  • Recognized for its elongated body, curled tail, and unique pattern of lines and spots.
  • A slow-moving species that uses its prehensile tail to anchor itself to seagrass, corals, or other structures.
  • Unlike most fish, seahorses swim in an upright position and rely on rapid fin movements for propulsion.
  • Highly sought after in the aquarium trade due to its distinctive appearance and intriguing behavior.

Feeding

  • Carnivorous, primarily consuming small crustaceans, such as copepods, amphipods, and mysis shrimp.
  • Requires frequent feedings (at least 3-4 times per day) due to its lack of a stomach and rapid digestion.
  • Best fed with live or frozen enriched foods, as they are slow, deliberate feeders.
  • May struggle in tanks with fast-moving fish that outcompete them for food.
  • Seahorses use a specialized "snick" feeding motion to suck prey into their tubular snouts.

Habitat

  • Commonly found in seagrass beds, mangrove roots, and shallow coastal waters.
  • Requires an aquarium with plenty of hitching posts, such as live rock, artificial coral, or branching plants.
  • Prefers a low-flow environment, as strong currents can make swimming difficult.
  • Best housed in a species-specific tank to ensure proper feeding and care.
  • A minimum tank size of 30 gallons is recommended for a pair, with additional space needed for groups.

Fish Care

  • Optimal water temperature: 72-78°F (22-26°C).
  • Ideal pH range: 8.1-8.4, with a specific gravity of 1.022-1.025.
  • Highly sensitive to ammonia, nitrites, and other water quality fluctuations.
  • Requires a mature, well-established aquarium with stable parameters.
  • Frequent water changes and proper filtration are essential for maintaining health.

Compatibility

  • Best suited for a peaceful, species-only tank or with other slow-moving, non-aggressive fish.
  • Compatible with pipefish, small gobies, and certain blennies that do not compete for food.
  • Should not be housed with fast-swimming, aggressive, or territorial fish.
  • Avoid housing with stinging corals or anemones, as seahorses may accidentally latch onto them.
  • Pairs and small groups thrive in aquariums where they can interact and exhibit natural social behaviors.

Aquarium Behavior

  • Spends most of its time clinging to structures with its tail rather than actively swimming.
  • Known for unique courtship dances, where pairs intertwine tails and perform synchronized movements.
  • Exhibits social behavior, often forming pair bonds that can last for extended periods.
  • Fascinating to observe due to its distinctive movements and method of capturing prey.
  • Requires a stable and stress-free environment to thrive, with plenty of hiding spots and hitching posts.