5 research outputs found
Effects of Early Thermal Environment on Growth, Age at Maturity, and Sexual Size Dimorphism in Arctic Charr
The effects of early thermal environment on growth, age at maturity, and sexual size
dimorphism in Arctic charr (Salvelinus alpinus) are investigated. This study is a 654-day long rearing
trial split into two sequential experimental phases termed EP1 and EP2 and lasting 315 and 339 days,
respectively. EP1 started at the end of the yolk sac stage when the experimental fish were divided
into three groups and reared at different target temperatures (7, 10 and 12 ◦C). During EP2, all groups
were reared at the same temperature (7–8 ◦C) until harvest (~1300 g). Growth rates increased with
temperature from 7 to 12 ◦C, and at the end of EP1 the 12C group had 49.0% and 19.2% higher mean
weight than groups 7C and 10C, respectively. Elevated early rearing temperatures were, however,
found to cause precocious sexual maturation and reduce the long-term growth performance. At the
end of EP2, the 7C group had 3.6% and 14.1% higher mean weight than 10C and 12C, respectively.
Elevated early rearing temperatures had a much stronger effect on the maturity incidence of females,
and while male-biased sexual size dimorphism (SSD) was found in all groups, the magnitude of SSD
was positively associated with temperature
BASECOD - Stable and safe production of high quality cod larvae and juveniles
Stable supplies of high quality cod larvae and juveniles are urgently needed for the development of successful cod farming industries in countries around the North Atlantic. The project is a collaboration between key actors from the cod farming industry and the research sector in Iceland, Norway and the Faroe Islands, with involvement of additional key actors and stakeholders within the Nordic countries and Canad