Why does Dyneema® make an excellent salmon / trout net? You can keep the break load whilst drastically reduce twine size – or use the higher strength to upgrade break load without increasing volume/weight. With a thinner twine – you delay the point where the net needs to be cleaned or replaced. You also reduce the amount of net coatings such as antifouling liquid needed to coat the net. That alone can pay for the slight increase in cost of using Dyneema® over traditional materials as nylon and polyester.
Large salmon or trout pens with thousands of tons of fish must have excellent water flow through the cage to keep high oxygen levels high.
Low oxygen levels effects fish welfare and will in turn have a negative influence of feeding and growth.
Finding the right balance between mesh size and twine thickness is key to having as big a mesh opening as possible. This then needs to be aligned with the size of smolt being introduced into the net pens.
Cage nets designed are in a way that means all stress and tension is absorbed by framing ropes rather than the netting. Carefully chosen materials that interact with each other to create a safe enclosure. A salmon or trout net is not an off the shelve product. Tweeking the mesh size to maximize the water flow while ensuring fish are not getting caught is one of the keys.