Seawater adaptability of two strains of arctic char (Salvelinus alpinus) reared under different light regimes
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http://hdl.handle.net/11250/104332Utgivelsesdato
1987Metadata
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This report is not to be cited without prior reference to the authorsSammendrag
Groups of Arctic char (Salvelinus alpinus) were reared under
three experimental light regimes. Two different strains of char
were used, one non-migratory from south Norway, the other anadromous
from northern Norway. All groups received a continous
background illumination. One of the experimental light regimes
consisted only of this background illumination. The remaining
two treatments consisted of an additional simulated natural photoperiod,
using either yellow light or daylight. Growth rate was
monitored during the experiment. A Seawater Challenge Test
(SWCT) was run for 24 hours to evaluate the ability of the two
strains of char to tolerate and survive in seawater.
There were no significant differences in growth rate in either
strain between the experimental light regimes. Condition factor
increased during the experimental period for fish of both
strains and all light regimes. Both strains tolerated the SWCT
without mortalities. Size seems to be the most important factor
for seawater adaptability of Arctic char. There were no signs of
a smoltification process as seen in Atlantic salmon (Salmo salar).