Photoperiod in seawater influence seasonal growth and chemical composition in autumn sea-transferred Atlantic salmon (Salmo salar L.) given two vaccines

Body size dimorphism of sea-reared Atlantic salmon (Salmo salar L.): Implications for the management of sexual maturation and harvest quality

“…This is consistent with previous studies in which K seasonality was linked to a lower growth in weight than in length in periods of low water temperature (Oppedal et al, 1999;2003;. Photoperiod was also shown to affect growth pattern with stocks exposed to LL exhibiting a higher rate of muscle fibre recruitment and ultimately an improved K (Johnston et al, 2003;Oppedal et al, 2006). In our survey, immature fish harvested in June and July and showing the lowest K at harvest (Table 2b) were not exposed to LL unlike stocks harvested from August onwards.…”

Effects of light source and intensity on sexual maturation, growth and swimming behaviour of Atlantic salmon in sea cages

“…A significantly higher condition factor paralleled the growth increase (Johnston et al 2003). The development of condition factor in the study of Johnston et al (2003) is very similar to the results of Nordgarden et al (2003) and Oppedal et al (2003Oppedal et al ( , 2006, but in the latter studies, the fish were followed for an additional 6 mo, an extension that revealed a seasonal pattern.…”

“…Further, the fact that Endal et al (2000) and Oppedal et al (2006) found a continuation of faster growth than under natural light, also after artificial lighting ceased, supports the theory of an adjusted circannual growth rhythm. Along the same lines, Oppedal et al (1997Oppedal et al ( , 1999Oppedal et al ( , 2003Oppedal et al ( , 2006, Nordgarden et al (2003) and Johnston et al (2003) found distinct shifts in the seasonal patterns of SGR and condition factor following the onset or switching off of artificial light. In the present study, no differences were found after 3 mo, but the groups that were reared under continuous light were significantly heavier and had a higher condition factor 5 mo after the onset of light, harmonizing with the studies above.…”

Different Dietary Levels of Protein to Lipid Ratio Affected Digestive Efficiency, Skeletal Growth, and Muscle Protein in Rainbow Trout Families

“…Deformities in juvenile tench (Tinca tinca L.) with significantly elevated whole body lipid have been reported [36]. Increased growth in Atlantic salmon (Salmo salar L.) stimulated by continuous light, which is not caused by increased protein deposition [10] but by increased lipid deposition [13], results in reduced mechanical strength and growth of the vertebrae in Atlantic salmon postsmolts [37]. Thus, stimulating fish growth without concerning with appropriate dietary P/L ratio and P/L ratio deposition in muscle or body may affect the strength of skeletal growth and cause deformities.…”

“…The growth efficiency of several fish species has been studied through variation of dietary protein levels, and the results have shown not only the relationships between dietary protein concentration and physiological parameters of consumption, growth, and protein content in body or muscle, but also shown certain increased levels of dietary protein limited consumption and growth of the fish recently, that is, [1][2][3][4][5][6][7][8][9]. Increased growth is usually not associated with an increase in protein deposition rate, that is, [10][11][12], but rather an increase in lipid deposition rate, that is, [8,13]. Traditionally in aquaculture, dietary protein and lipid are varied throughout the life cycle to optimise the economic return.…”