Site selection
When selecting
the sites for sea cage farms several criteria are important. Some species
independent criteria used when evaluating a site are as follows:
1.
Stable water quality (the actual quality requirements
will be species dependent)
2.
Good water exchange, but not too high a velocity
(below 1 m/s is recommended)
3.
Minimum depth under the cages of 5 m
4.
Good infrastructure
5.
Temperature above 0°C to avoid icing; otherwise
temperature appropriate for the species
6.
Not close to potential sources of water contamination
7.
For wave heights above 3 m the equipment costs are
rather high.
When having a
sea cage farm the use of several sites is recommended. If having species that
need more than one year to reach the marked size or when having several inputs
of juveniles every year it is advisable to use different sites (Fig. 21.26) to
reduce the possibility of disease transfer between the inputs/generations. In
addition, is it advisable to let the sites rest for a year after some years in
production. This has been shown to improve production on the site. If this
production model is used, the sites must not be too close together. The
distance depends on the current conditions between the sites, but typically at
least 1.5 km is recommended.
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