Big-scale sand smelt

Big-scale sand smelt

Scientific name: Atherina boyeri

Suborder: Atheriniformes

Genus: Atherina

Family: Atherinidae

Habitat: Coastal lagoons, estuaries, brackish waters, and shallow coastal zones; usually in waters less than 10 m deep.

Maximum length in the Mediterranean: Typically 10 – 12 cm

This species of fish has an elongated, slender body, which is compressed laterally. The big-scale sand smelt has a bright silver colouring on the sides, and a greyish or greenish colour on its back. Its colouring is not very apparent, as it’s almost translucent, with a bluish-yellow longitudinal band running along its entire body. It has a large eye that occupies most of its head.

It lives in schools near the surface and is always close to the coast in calm waters. It has a very high tolerance to temperature and salinity which allows it to survive in highly variable habitats from the sea to estuaries and lagoons. It forms dense schools, especially when young, as a defence strategy against predators. It is preyed upon by larger fish, coastal birds and crabs.

An Interesting fact about the big-scale sand smelt is that in optima temperatures, individuals of this species can multiply their size by 10 times.

The big-scale sand smelt is commonly used as bait by fishers targeting larger species. As a result, it can be subject to localised overfishing, which may impact population sizes in certain areas.

In Mediterranean coastal regions, the main pressures affecting this species are largely linked to human activity. Habitat degradation caused by coastal development, pollution, and seafloor disturbance can reduce the quality of the shallow waters where juveniles and shoals typically thrive. The species may also be affected by broader environmental changes, including rising sea temperatures and shifts in prey availability associated with climate change.

Additionally, high levels of boat traffic and recreational activity in coastal zones can disturb or displace shoals, potentially altering their natural behaviour and feeding patterns. While the species is not currently considered endangered, these combined pressures can make local populations sensitive to human impacts.

Threats

Overfishing and boat traffic

What can we do?

We can choose to eat fish which is in season so as not to promote overfishing of certain species. Always drive a boat slowly in coastal areas.

Threats

Rising sea temperature

What can we do?

Minimise our environmental impact by making more sustainable choices, from the seasonality of our food, to choosing from where to buy clothes.

Threats

Seafloor disturbance

What can we do?

Try not to trample on sensitive seabed areas such as seagrass and corals, and avoid anchoring boats in Posidonia meadows.

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