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SCUBA News - #311 - June 2026

SCUBA News

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SCUBA News (ISSN 1476-8011)
Issue 311 - June 2026
https://www.scubatravel.co.uk
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Welcome to June's SCUBA News. Whether you're just drying off your gear or already planning your next underwater adventure, we hope this issue brings a little inspiration for the months ahead. As well dive destination ideas, our Creature of the Month is the blue-spotted cornetfish - that placid predator that hunts with octopus, eats lionfish and has a remarkable ability to change colour.


What's New at SCUBA Travel?

Whaleshark

Dive Kenya: Reefs, Rays and Whale Sharks

Kenya offers warm waters, vibrant reefs and abundant marine life: unforgettable encounters in the Indian Ocean.
READ MORE

Raja Ampat

Indonesia's top dive regions: How to choose where to go

The challenge is not deciding whether to dive Indonesia; it is in choosing exactly where. Beginner? Love currents? Small creatures? Big pelagics?
FIND OUT

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Bluespotted Cornetfish, Fistularia commersonii, is our creature of the month

As with many fish, the cornetfish has several different names. Whatever you call it, I am talking about the long, tubular fish you see hovering in the waters of the Red Sea, Sea of Cortez and Indo-Pacific. Recently, it has also been seen in the Mediterranean and the Eastern Central Pacific.

Cornetfish
Bluespotted Cornetfish, also known as a smooth cornetfish, trumpetfish or flutemouth. Tim Nicholson

A Lionfish-Stalking Hunter

A stalking predator, it is one of the few fish which eats the venomous lionfish, ambushing it from from behind. The unlikely-looking hunter also seeks opportunities to hunt alongside other species. For example, an octopus pursues prey into crevices whist the cornetfish floats in the water column waiting for fish to be flushed out. If it takes more than its fair share though, it runs the risk of being punched by the octopus.

Females are bigger than Males

Easily recognised, the cornet fish grows up to 160 cm (five feet) long. Females reach larger lengths and weights than males.

The tail fin has a long filament running off it which is lined with sensory pores which may act as a long-range system for detecting prey.

Cornetfish
Can grow to lengths over five feet

Instead of scales the cornetfish has small spines embedded in its skin.

Breed when water warm enough

Their reproductive season lasts as long as the water is warm enough at 22oC. In the north it is for six months over the summer, peaking in August. Juveniles often live in a seagrass nursery.

The fish may be solitary or in schools.

School of cornetfish
Small school of cornetfish. Francescodj/CC BY-NC 4.0 via iNaturalist

Depth-wise they are very wide-ranging, from 1 m to at least 132 m and possibly 296 m.

Cornetfish change colour

Normally F. commersonii is brownish to olive green on top and a lighter silvery colour below, with a pair of blue stripes or rows of dots along its back. However, it can change colours to show a disruptive pattern of dark bands to create false edges and decrease detectability. They can also lighten their colour when going over sand.

Cornetfish at Soma Bay
Cornetfish at Soma Bay, Red Sea. Louis P B/CC BY-NC 4.0 via iNaturalist

Next time you're on a dive with cornetfish, take a moment to watch their hunting and colour strategies.

Class: Actinopterygii (Ray-finned fishes) > Order: Syngnathiform (also pipefish and seahorses > Family: Fistulariidae > Genus: Fistularia

Sources and References

Lieske and Myers, Coral Reef Guide Red Sea (2012)
A Natural Predator of the Lionfish, Pterois miles, Gilad Bernadsky and Denis Goulet, Copeia, Vol. 1991, No. 1 (Feb. 7, 1991), pp. 230-231

Bariche, M. et al (2013). Reproduction of the invasive bluespotted cornetfish Fistularia commersonii (Teleostei, Fistulariidae) in the Mediterranean Sea. Marine Biology Research, 9(2), 169-180. https://doi.org/10.1080/17451000.2012.707322

Ascione, S. J. et al (2026). The state of knowledge on four families of Syngnathoidei fishes (Teleostei: Syngnathiformes): Aulostomidae, Centriscidae, Fistulariidae and Solenostomidae. Journal of Fish Biology, 1-50. https://doi.org/10.1111/jfb.70393

Castillo, M. A., et al (2022). Disruptive coloration and behavior facilitate camouflage of blue-spotted cornetfish against complex coral reef bottoms. Marine Ecology, 43, e12731. https://doi.org/10.1111/maec.12731



Diving news from around the World

Octopus

Study shows octopuses' impressive ability to navigate space
The invertebrates can solve a spatial problem using a mirror, which is more than I can do.

Australian reef

The last-ditch plan to save coral reefs from utter destruction
Bleaching has devastated reefs around the world. Yet new interventions have revealed that corals can be remarkably resilient if we can give them enough help to recover

Great White Shark

Shark expert says Tony Abbott doesn't understand the science after former PM calls for cull
Another expert says drone technology may have prevented shark attack at Coogee beach on Saturday. A cull of sharks would make no difference, as sharks know no boundaries.

Plastic on beach

Plastic food packaging blankets the world's coastlines, study finds
Food and beverage plastics were the most common litter type for 93% of countries surveyed; the pattern was consistent across countries, regardless of waste management infrastructure.

Dolphins

Female dolphins remember who is aggressive when choosing a mate
Female dolphins identify males by their unique calls and keep track of their past behaviour, choosing to avoid the most aggressive males during mating season.

Dolphins in Red Sea

Human activity can reshape dolphin social lives...
Human-linked foraging and red tide events influence how dolphins associate with one another

Coral reef fish

...And those of reef fish
When ocean acidification makes reef habitat less complex, the fish living there gather in smaller shoals that offer less social protection.

Listen to the science

World's deepest banner protest launched at the bottom of the sea
Deep below the ocean surface, at roughly the depth of 130 five-story buildings stacked end to end, a robot has unfurled a protest sign that reads: LISTEN TO THE SCIENCE!

Wind assisted ship

Wind-assisted cargo ships could more than halve shipping emissions
The shipping industry is responsible for around 3 per cent of CO2 emissions, and those emissions are growing - but adding high-tech sailing gear and using wind-favourable shipping routes could cut them by 50%.

Two individuals of Thecacera sesama sp. nov. feeding on a bryozoan.

Sesame sea slug species discovered in Taiwan
Translucent, speckled and barely the size of a grain of rice, a new species of sea slug has been identified in the coastal waters of Keelung, Taiwan

Solenostomus snuffleupagus hairy ghost pipefish

From sesame seed to Sesame Street
It's hairy, bright orange and exceptional at camouflaging. Meet the newly described hairy ghost pipefish species, demonstrating that even well-studied marine environments like the Great Barrier Reef still hold remarkable secrets.


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Photo credits: Tim Nicholson; Jill Studholme; NOAA; Wallenius Marine, David Harasti, Ho-Yeung Chan et al/CC BY-NC 4.0; DepositPhotos; divebooker.com

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