Fig. 1. Specific growth rate (SGR) of Atlantic cod exposed to 46%, 76% (control) and 145% oxygen saturation for 6 weeks. SGR=[100xln(m₁)-ln(m₀)/41] in which m₁ is mass at day 41, m₀ is mass at day 0. The box plots show median, 25th and 75th percentiles (box) and error bars the range (highest to lowest values); N=6. 46% vs 76%: P<0.05, 46% vs 145%: P<0.01 (Kruskal-Wallis; overall P=0.0026). 1, significant difference between the hypoxia and normoxia groups; 2, significant difference between the hypoxia and hyperoxia groups.