Emergence of Baltic salmon, Salmo salar L., in relation to temperature: a laboratory study

• Published in: Journal of Fish Biology
• Main Author: Brännäs, E.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1988
• Subjects: Atlantic salmon; Salmo salar
• Online Access: http://dx.doi.org/10.1111/j.1095-8649.1988.tb05502.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1988.tb05502.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1988.tb05502.x

Emergence pattern and developmental status at emergence of Baltic salmon fry from the Umeälven hatchery stock (63°50′N, 20°25′E) were studied at 6, 10 and 12°C in the laboratory. The number of days and degree days from hatching to 50% emergence decreased exponentially with increasing temperature. Synchronization of emergence increased with temperature. Optimal temperature for incubation of yolk‐sac alevins was 10°C, which resulted in the largest fry at emergence and the lowest death rate. Fry kept at 6°C had the lowest mean weight and at 12°C the highest death rate. The fry emerged at an earlier developmental state with more yolk at 12°C than at 6°C. The Baltic salmon had a faster developmental rate during the gravel‐phase, as compared to more southern Atlantic salmon populations.