Net enclosure
A net enclosure is a facility for fish farming in open waters. It consists of a buoyant carrier system and a net in which the fish are kept. The enclosures can be equipped with an automatic feeding system.
Net pens are made in sizes up to 30 m in diameter and 15 m deep. If the system is also closed at the top with a net, it can be used submerged and thus used safely even in rough seas. A cover prevents the fish from escaping by jumping over the edge of the net.
It is believed that fish were caged in Southeast Asia as early as the 19th century before they were sold in the market. Modern netting began in the 1950s with the appearance of the first synthetic materials.
The most common way of growing salmon is in net pens. The stocking density is around 40 kg of fish per cubic meter of water. Marine net cages are mostly installed near the coast. However, there were also efforts to operate considerably larger and highly automated systems on the open sea.
Individual evidence
- ^ A b Magdy Soltan: Cage culture of freshwater fish . January 1, 2016, doi : 10.13140 / rg.2.1.4802.2803 ( researchgate.net [accessed December 10, 2017]).
- ↑ G. Horlemann, K. Lübke, M. Geiser: Marine fish from aquaculture. Bavarian State Ministry for the Environment and Consumer Protection, December 14, 2016, accessed on December 10, 2017 .
- ↑ Jürgen Rees: Big prey in fish farming. Wirtschaftswoche, March 18, 2008, accessed December 10, 2017 .