Feed control
The appetite of
the fish is affected by external factors, such as variation in water
temperature, water quality, waves (in cages) and light conditions. With a
normal feed control, the amount of feed to distribute during a given period is
fixed. If there is variation in fish appetite there are no possibilities for
controlling this. This requires one of two solutions: the use of restrictive
feeding with no feed loss, (really underfeeding), or acceptance of a certain
feed loss which is expensive and damaging to the environment.
Hand feeding is
an old-fashioned system for regulating feed supply. The person who is feeding
observes the appetite of the fish visually, and in this way regulates the
amount of feed supplied according to fish appetite. One way to improve the feed
control and utilization of feed is to use a feeder for basic feeding and hand
feeding for topping up; this, however, requires manpower. Based on this,
systems have been developed for automatic feed control which are of special
interest in production units where large amounts of feed are used, such as
large sea cages.
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