Narrow-bellied Seahorse
Hippocampus angustus
Also known as: Western Australian Seahorse, Western Spiny Seahorse
A spiny Western Australian seahorse with a distinctively slender profile.

About
The narrow-bellied seahorse (Hippocampus angustus) is one of Australia's more recognizable seahorse species, known for its noticeably slim trunk and well-developed spines that give it a somewhat armored appearance compared to smoother species. It is primarily found along the southwestern coast of Australia, where it inhabits seagrass beds, algae, and other structured environments that offer both camouflage and convenient holdfasts for its prehensile tail. Like all seahorses, it is an ambush predator, staying anchored to substrate while waiting for small crustaceans and other tiny invertebrates to drift within striking range. The narrow-bellied seahorse sits in intermediate territory when it comes to aquarium keeping. Not the most demanding species in the genus, but not a beginner's fish either. Seahorses as a group require thoughtful feeding routines, typically needing multiple small feedings per day, and do best with tank mates that won't outcompete them for food or stress them with erratic movement. This species is generally best paired with other seahorses or calm, slow-moving fish. A species-focused setup with good water quality and appropriate anchor points goes a long way toward keeping this animal comfortable and healthy over the long term.
Good tank mates
Species that tend to coexist peacefully with Narrow-bellied Seahorse
Frequently asked questions
- Is the Narrow-bellied Seahorse aggressive?
- The Narrow-bellied Seahorse is generally peaceful and suits a community tank with similarly calm tankmates.
- What does the Narrow-bellied Seahorse eat?
- The Narrow-bellied Seahorse is a carnivore. It needs a meaty, protein-rich diet of frozen or live foods.
- Is the Narrow-bellied Seahorse reef safe?
- The Narrow-bellied Seahorse is generally considered reef safe.