From birth the alevin has with it a sack of
food that it lives off during the first period
(photo © Artemia Reference Center, Gent University, Belgium)
Different alevin grow at different rates just like humans and thus must be sorted (grading)
(photo © Artemia Reference Center, Gent University, Belgium) |
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The first few weeks after hatching, the alevin (young fish, fry) live on the food in the yolk-sac on their stomachs. When most of the yolk is consumed the fry are moved into large shallow fish tanks, which hold up to 10,000 fish per square metre. There, they start feeding. The first feeding period lasts for 6 weeks, then the fish are sorted by size and put into larger tanks (a process known as grading).
It takes approximately one year for the fish to be ready for the seawater stage. During this period, the fish are graded regularly so as to ensure best growth results. The temperature and light conditions are very important for the physiological development of the fry into a smolt. Usually, this transformation takes place in the spring. The fish are vaccinated several times, prior to removal to the sea in special tanks on trucks, or onboard special equipped boats.
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