Bluespotted cornetfish

What it is

This marine fish belongs to the family Fistulariidae and the order Syngnathiformes, sharing lineage with pipefishes and seahorses. It possesses an unusually long and slender body, reaching up to 1.6 metres in length, though one metre is more common. The head features a tubular snout and large eyes, while the tail ends in a long filament lined with sensory pores. Its skin displays a blue to greenish-grey tint with two thin blue stripes or dot lines along the back. At night, the pattern shifts to broad bands for camouflage.

Where it lives

Native habitats include tropical and subtropical zones of the Indo-Pacific, extending north to Japan and east to the Americas, including Panama and the Sea of Cortez. It also inhabits the Red Sea. Since 2000, the species has entered the Mediterranean Sea via the Suez Canal, a process known as Lessepsian migration. It spread rapidly westward, reaching the Gulf of Lions by 2007. Today, it is found in all Mediterranean sub-basins and is particularly common in the eastern regions.

How it lives

Usually a solitary predator, this fish stalks small fishes, crustaceans, and squid. It sometimes feeds in small groups near the seabed, using its long snout to suck up bottom-dwelling prey. It is highly efficient at hunting young fish within seagrass meadows, which impacts native survival rates. The fish may also hover or swim in small schools just below the surface. Bacteria in its skin mucus may help it glide through salt water. Parasites from its native range continue to thrive in new territories, challenging the enemy release hypothesis.

Breeding and life cycle

Reproduction is oviparous, meaning the large eggs develop and hatch outside the female's body. The resulting larvae are small, measuring between 6 and 7 millimetres upon hatching. In the Mediterranean, the population likely descended from a small number of ancestors, possibly from a single invasion event. This bottleneck has resulted in lower genetic variability compared to conspecifics in the Red Sea.

Fish and people

Commercially, the species holds minor importance. It is often processed into fish meal, though it is also sold fresh or preserved. Some individuals are kept in aquariums. In the Mediterranean, it is regarded as an invasive species due to its rapid reproductive development and detrimental effects on native fish stocks. Its presence alters local ecosystems by reducing the ability of indigenous species to reach reproductive adulthood.

Status and threats

The fish is considered invasive in the Mediterranean Sea. Its rapid expansion and predation on native juvenile fish pose a threat to local biodiversity. The population in this region stems from limited genetic stock, yet it thrives despite carrying parasites from its original habitat. No specific conservation status is listed for its native range, but its spread is monitored due to ecological impact.

Questions people ask about Bluespotted cornetfish

Good reading and sources

• Bluespotted cornetfish on WikipediaEncyclopedia
• More photos on Wikimedia CommonsPhotos
• Wikidata recordOpen data