A new, escape-proof fish cage for a lice-free salmon farm

phys.org | 1/2/2019 | Staff
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In October this year, the first salmon were farmed in a new fish production prototype in Trøndelag, Norway. With a rigid steel construction and a water current generator, the new Aquatraz fish cage both prevents fish escape and keeps the fish in shape, while researchers from the Norwegian Institute for Water Research (NIVA) are monitoring the sea lice and water quality in the cage.

The name of the new cage concept is inspired by the high-security prison Alcatraz on Alcatraz Island in the San Francisco Bay, from which no prisoner could escape. The goal is that the fish prison will be just as escape proof —and hopefully, house less sea lice.

Honour - Part - Project - Researcher - Sara

"It is both an honour, and very interesting, to be a part of this project," says researcher Sara Calabrese at the Norwegian Institute for Water Research (NIVA).

She and her colleague Anders Hobæk are back from their first water sampling at Aquatraz. The cage is located in Eiterfjorden, north in Trøndelag county, Norway. The coming year, NIVA will monitor the aquatic environment in the cage.

Aquatraz - Result - Cooperation - Company - Midt-Norsk

Aquatraz is a result of cooperation between the company Midt-Norsk Havbruk and Seafarming Systems. The cage is 18 meters deep, has a circumference of 160 meters, and it has a new design never tested before: The whole cage can be lifted above sea level, the water is supplied from the deeper layers, and the lice skirt is made of steel.

"The eight uppermost meters of the cage is enclosed by a wall. This wall prevents the lice from getting into the cage, as sea lice usually live in the upper meters of the water column," Calabrese explains. She did her Ph.D. on semi-closed aquaculture systems like Aquatraz.

Wall - Lice - Skirt - Farming - Terminology

The wall, or lice skirt, as it is called in fish farming terminology, is made of steel, and is more resistant to deformation...
(Excerpt) Read more at: phys.org
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