The growth
was good in late autumn and in spring, with peak lengths of the sporophytes in June, while being poor in winter
and summer. As a result of a faster initial growth at the fish farm than at the reference station from August to
November, the August-sporophytes reached a significantly longer length than those at the reference station in
5 out of 10 sampling months at 2 m depth, and in 9 out of 10 months at 5 m depth (p b 0.05) over the year,
while no significantly different lengths were found at 8 m depth. The November-sporophytes showed similar
growth rates and lengths at the fish farm and at the reference station, while the February-sporophytes grew
faster at 5 and 8 m depths at the fish farm than at the reference station, with significantly longer blades at 5 m
depth at thefish farm than at the reference station at peak lengths in June (p b 0.05). The sporophytes deployed
in June did not survive the summer. Holding the rapid growth of S. latissimain spring and early summer together
with the increase in salmon biomass and feed use in late summer and early autumn suggested a seasonal
mismatch considering direct recycling of the nutrient input from salmon farming by macroalgae in Norwegian
coastal waters.
The growth
was good in late autumn and in spring, with peak lengths of the sporophytes in June, while being poor in winter
and summer. As a result of a faster initial growth at the fish farm than at the reference station from August to
November, the August-sporophytes reached a significantly longer length than those at the reference station in
5 out of 10 sampling months at 2 m depth, and in 9 out of 10 months at 5 m depth (p b 0.05) over the year,
while no significantly different lengths were found at 8 m depth. The November-sporophytes showed similar
growth rates and lengths at the fish farm and at the reference station, while the February-sporophytes grew
faster at 5 and 8 m depths at the fish farm than at the reference station, with significantly longer blades at 5 m
depth at thefish farm than at the reference station at peak lengths in June (p b 0.05). The sporophytes deployed
in June did not survive the summer. Holding the rapid growth of S. latissimain spring and early summer together
with the increase in salmon biomass and feed use in late summer and early autumn suggested a seasonal
mismatch considering direct recycling of the nutrient input from salmon farming by macroalgae in Norwegian
coastal waters.
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