The capacity in areas with fish farming, the proper size of the area to raise with mussel farming net.
Since the feed for intensive fish farming is collected outside the area where the farming takes place, it is more appropriate to use the concept of holding capacity defined as: “the potential maximum production which is limited by a non-trophic resource” and production capacity defined as: “the maximum tonnage level that can be attained without producing a negative impact on the environment and on the farmed stock“ rather than carrying capacity (Rosenthal et al. 1988). When a fish farm is placed in a fjord or another marine area, the question is whether there is sufficient holding or production capacity left in the system. Norwegian fjords are mostly oligotrophic and so far the widely spread fish farms have not been exceeding the limits of their capacity. However, an expansion in the fish production or a change in the location strategy from widely dispersed farms to areas designated for fish farming may change the picture. Mussel Farming Net also helps in increasing the production of the farming.
The production capacity in a fjord with regard to organic material will depend on the characteristics of the fjord, such as depth and current, and of the organic material, such as amount and sinking velocity. The sources of organic material in the coastal zone are many such as sewage, phytoplankton and macroalgae assemblages. The latter are washed down to the sediment from shallow areas and may contribute substantially to the organic input to the sediment in Norwegian coastal areas. These other sources of organic material may cause the seabed to be oxygen depleted and any additional material from fish farms resulting in the same effect will exceed the capacity of the area. It is therefore necessary to be able to.