Seasonally changing metabolism in Atlantic salmon (Salmo salar L.) I - Growth and feed conversion ratio.

By U. Nordgarden, F. Oppedal, G. Taranger, G. Hemre, T. Hansen. 2003

107 citations recorded by the source corpus.

To determine seasonal variation in growth and feed conversion ratio (FCR), Atlantic salmon postsmolts (Salmo salar L.) were exposed to either simulated natural photoperiod (SNP) for 12 months or continuous light (LL) from January to June followed by SNP until December. Feed was given to excess and uneaten feed pellets were collected after every meal for estimation of feed intake and calculation of FCR. Body weight increased from 1086 ± 9 g (mean ± SEM) in January to 4970 ± 7 g (SNP) and 5190 ± 23 g (LL) in December. Specific growth rate (SGR), condition factor and feed intake displayed strong seasonal variation in both groups. Measurements of the thermal growth coefficient correlated highly with SGR (r = 0.98, P < 0.05), indicating that the seasonal variation in SGR was independent of temperature and fish size. Continuous light treatment resulted in increased growth from spring, while the fish exposed to simulated natural light had increased growth rate in late summer. Furthermore, LL improved FCR. Periods of high SGR were concurrent with periods of low FCR in both groups.

Subfields: Aquatic Science, Nature and Landscape Conservation, Physiology

View Paper: https://www.semanticscholar.org/paper/1672f96ad6958c68dbe11ed42ea6b7470b1f45c4

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In Aquatic Science

1. F. Oppedal
2. T. Torgersen
3. T. Dempster
4. L. Stien
5. P. Fjelldal
6. T. Hansen
7. O. Folkedal
8. J. Nilsson

In Nature and Landscape Conservation

1. F. Oppedal
2. L. Stien
3. T. Dempster
4. T. Torgersen
5. O. Folkedal
6. P. Fjelldal
7. Ø. Korsøen
8. T. Hansen

In Physiology

1. P. Fjelldal
2. T. Hansen
3. T. Dempster
4. F. Oppedal

Citations in the corpus

• Submergence of Atlantic salmon (Salmo salar L.) in commercial scale sea-cages: A potential short-term solution to poor surface conditions (2009, result): “0) compared to other trials on fish of similar size in spring (FCR=0.8–1.05; Nordgarden et al., 2003).”
• Impact of smolt production strategy on vertebral growth and mineralisation during smoltification and the early seawater phase in Atlantic salmon (Salmo salar, L.) (2006, background): “In Atlantic salmon, both increased temperature (Dwyer and Piper, 1987; Siemien and Carline, 1991; Solbakken et al., 1994; Bendiksen et al., 2003) and continuous light (Saunders and Harmon, 1988; Krakenes et al., 1991; Hansen et al., 1992; Nordgarden et al., 2003 ) have been shown to increase growth”
• The biological requirements for post-smolt Atlantic salmon in closed-containment systems (2011, background): “Nordgarden et al. (2003) reported a seasonal variation in TGC from −0.2 in January to February to 3.7 in April to May in salmon reared in indoor tanks either under simulated natural photoperiod, or under continuous light from January to July and a simulated natural photoperiod thereafter.”
• Sedimentation of organic matter from fish farms in oligotrophic Mediterranean assessed through bulk and stable isotope (δ13C and δ15N) analyses (2007, result): “The food conversion ratios for sea bass and sea bream in the examined farms were high (1.6 to 2.4) compared to experimental studies (Vergara et al., 1999) and those for salmonids (Nordgarden et al., 2003).”
• Salmon Welfare Index Model (SWIM 1.0): a semantic model for overall welfare assessment of caged Atlantic salmon: review of the selected welfare indicators and model presentation (2013, background): “1993), and it may be manipulated using artificial photoperiods (Taranger et al. 1995; Nordgarden et al. 2003; Oppedal et al. 2003).”