Fish Active day and night

Mediterranean Horse Mackerel

Trachurus mediterraneus

iNaturalist Wikipedia

A silver streak of the sea, the Mediterranean Horse Mackerel is a master of collective motion. Found in shimmering schools from the Bay of Biscay to the Black Sea, this resilient species is a vital link in the marine food web.

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Quick Identification

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Size

Typically 20–30 cm (8–12 in), but can reach a maximum length of 60 cm (24 in); weighs up to 1 kg (2.2 lbs).

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Colors

Iridiscent greenish-blue or grey on the back with shimmering silvery sides and a white belly; a small, distinct black spot on the gill cover.

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Key Features

Distinct lateral line with large, bony scutes
Two separate dorsal fins, the first being spiny
Deeply forked tail fin
Elongated, streamlined 'mackerel-shaped' body

When You’ll See Them

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Activity pattern Active day and night

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Peak hours 6-9 AM, 5-8 PM

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Season June-September

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Diet Primarily a carnivorous predator that feeds on zooplankton, small crustaceans like copepods, and the larvae of other fish. Adults also hunt small schooling fish such as anchovies and sardines.

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Habitat Subtropical marine environments, ranging from shallow coastal reefs and estuaries to offshore shelf waters.

Behavior

The Mediterranean Horse Mackerel is a highly social, gregarious species that spends much of its life in massive, tightly packed schools. These schools serve as a primary defense mechanism against larger predators like tuna and dolphins. They are benthopelagic, meaning they are comfortable both near the sandy seabed and up in the water column, often migrating vertically throughout the day to follow the movement of their prey.

In the Black Sea and Mediterranean, these fish exhibit significant seasonal migratory patterns, moving toward warmer coastal waters during the summer for spawning and retreating to deeper, more stable offshore waters during the winter months. While they are naturally skittish around large objects, their curiosity can be piqued by light and motion, making them a dynamic subject for underwater observation.

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Camera Tips

Capturing the Mediterranean Horse Mackerel requires an underwater camera setup, such as an action camera in a waterproof housing or a specialized submersible trail cam. For the best results, mount your camera to a pier piling or a weighted tripod on a sandy seabed at depths of 2 to 5 meters. Angling the camera slightly upward toward the surface will help capture the silver iridescence of their scales as they catch the sunlight.

Because these fish are attracted to light, using a camera with a subtle LED or placing a small underwater light nearby can draw in schools during dawn or dusk. If you are setting up near a dock, the natural shadow cast by the structure often provides a 'hangout' spot for these fish, making it an ideal placement for a stationary camera. Use a wide-angle lens to capture the full scope of the schooling behavior, as a narrow field of view may only show a blur of silver.

Patience is key; set your camera to record short video bursts rather than still photos. The movement of the school is much more impressive than a single still image. If baiting is permitted in your area, a mesh bag filled with crushed sardines or oily fish scraps can create a 'chum slick' that will keep a school in front of your lens for several minutes. Ensure your housing is cleaned of salt spray or algae regularly to maintain clear visibility.

Similar Species

Species that look similar or are commonly confused with Mediterranean Horse Mackerel.

Atlantic Horse Mackerel

Larger on average with a lateral line that curves more steeply toward the head.

Blue Jack Mackerel

Found in deeper water with a more vibrant blue coloration on the upper body and no dark spot on the gill cover.

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Frequently Asked Questions

They are most active during the 'crepuscular' hours of dawn and dusk when they move higher in the water column to feed on plankton, though they remain active day and night.

Use a light source at night or a mesh bait bag filled with oily fish like sardines to create a scent trail that draws the school into the camera's field of view.

They have a varied diet consisting of zooplankton, small crustaceans, and smaller fish such as anchovies.

Yes, they are very common in coastal regions, especially near piers, rocky reefs, and estuaries during the warmer summer months.

The Mediterranean species generally has a shorter pectoral fin and its lateral line scutes are slightly less prominent compared to the Atlantic Horse Mackerel.

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