Scaldfish

The Scaldfish (Arnoglossus laterna) is a species of flatfish belonging to the family Bothidae, commonly found in the eastern Atlantic and Mediterranean.

It is characterized by a compressed body, typical of the order Pleuronectiformes, with both eyes located on the left side of its head.

The body is covered with deciduous cycloid scales, meaning they fall off very easily upon touch or handling, a trait that gave the fish its common English name.

These fish are relatively small, rarely exceeding 15 centimeters in length, and possess a thin, elongated body shape suited for burrowing into sandy or muddy bottoms.

Their coloration is generally brownish or yellowish-grey, allowing them to blend seamlessly with the marine sediment, making them masters of camouflage.

In terms of agriculture, Arnoglossus laterna is not a crop pest; however, it can be considered a nuisance within coastal aquaculture and marine farming operations.

As a predatory species, it competes for food sources with commercially important fish species when they coexist in enclosed marine enclosures or cages.

The presence of Scaldfish larvae in water intake systems can lead to clogging and fouling of filtration membranes and pipes, disrupting farm operations.

Their predatory nature on small crustaceans and fish larvae can negatively impact the biodiversity and productivity of localized marine ecosystems.

While not a major economic pest, they are often treated as undesirable by-catch in coastal fisheries and aquaculture, requiring management to maintain production efficiency.

The activity of the Scaldfish is heavily influenced by the seasonal water temperature patterns within their native habitat.

Spawning typically occurs during the spring and summer months when the rising water temperatures favor the survival and development of the eggs.

During these peak periods, the population moves to shallower coastal waters, making them more frequently encountered by marine activities.

As winter approaches and water temperatures drop, these fish migrate toward deeper, more stable thermal zones to conserve energy and reduce metabolic demands.

Their life cycle is closely linked to the availability of nutrients and plankton, which also follow a seasonal bloom cycle in the marine environment.

Management of the Scaldfish in aquaculture settings focuses primarily on preventative measures to stop them from entering production systems.

Advanced mechanical filtration systems are the most effective way to prevent larvae and juvenile fish from entering pipes during water intake.

Routine maintenance and backwashing of intake screens are necessary to prevent physical damage or blockages caused by marine organisms.

Biological monitoring programs help farmers assess the density of such species in the surrounding water, allowing for better timing of water extraction.

• High-efficiency screen filtration.
• Regular inspection of subsea equipment.
• Strategic timing of water pumping during low-activity seasons.