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Monday, June 29, 2026
What Are Marine Protected Areas?
Sunday, June 28, 2026
SCUBA News - #311 - June 2026
SCUBA News~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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.
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Bluespotted Cornetfish, Fistularia commersonii, is our creature of the monthAs 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.
A Lionfish-Stalking HunterA 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 MalesEasily 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.
Instead of scales the cornetfish has small spines embedded in its skin. Breed when water warm enoughTheir 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.
Depth-wise they are very wide-ranging, from 1 m to at least 132 m and possibly 296 m. Cornetfish change colourNormally 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.
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 ReferencesLieske and Myers, Coral Reef Guide Red Sea (2012) 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
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