Lined Seahorse

Geographic Origin and Biotope: MARINE species native to the Western Atlantic Ocean (from Nova Scotia to South America). Mainly inhabits macroalgae beds, coastal mangroves, and shallow reefs, where it clings to vegetation using its prehensile tail.

Taxonomy and Morphology: Lined Seahorse (Hippocampus erectus). Bony fish (Syngnathidae). Armored body structure with dermal bony rings, tubular snout for rapid suction of prey, strictly erect posture, and prehensile tail without a fin.

Social Behavior: Extremely placid, methodical, and slow creature. Spends hours anchored to gorgonians or algae (hitching posts) analyzing the water in search of food. Forms monogamous bonds and greets each other daily with elaborate dances and color changes.

Coloration and Sexual Dimorphism: Color variable from yellow to brown, black, red, or orange, often with thin white lines on the neck (hence "Lined"). The male is easily distinguished by the presence of a prominent brood pouch (marsupium) under the abdomen.

Aquarium Setup: Specialized marine aquarium (minimum 120 liters / 30 gallons, TALL tank, very slow flow). INDISPENSABLE numerous hitching posts (Caulerpa macroalgae, fake gorgonians, smooth branches). Filters equipped with guards to prevent their tails from being sucked in.

Diet and Feeding: Micro-predatory carnivore with a rapid metabolism (does not have a true stomach). MUST be fed 2-3 times a day. Wild-caught specimens demand live Mysis and Artemia; captive-bred (CB) specimens eat frozen Mysis enriched with vitamins.

Water Quality: Maintain Salinity 1.020-1.025, pH 8.1-8.4, and cool temperature (22-26°C / 72-79°F maximum). Warmer temperatures quickly trigger bacterial proliferations (Vibrio) lethal to seahorses. Skimmer indispensable due to the numerous meals.

Compatibility and Tankmates: Optimal keeping only in SPECIES-ONLY tanks or with very small and very slow marine fish (e.g. Neon gobies, pipefish). Stinging corals (anemones, Euphyllia), crabs, and fast fish would compete for food or fatally injure them.

Aquarium Reproduction: Frequent in healthy specimens. The female transfers eggs into the male's pouch who undergoes the pregnancy. After 2-3 weeks the male "gives birth" to dozens/hundreds of perfect tiny seahorses, which require constant rotifer cultures.

Risks and Diseases: Very delicate. Susceptible to Gas Bubble Disease where bubbles form under the skin, lethal if untreated. Vibrio infections will decimate the tank if the temperature exceeds 26°C (79°F).