Mean (± standard deviation) heart total mass (HTM, g), heart total mass/body gutted mass ratio (HTM/BGM expressed in percentage), mean heart total lipids (HTLip, expressed in g <i>per</i> g of dry tissue), heart water loss (H_Water, expressed as percentage) and sex ratio of sea lamprey in

Cases in which the relative amounts of a fatty acid are significantly different (P< 0.001) among the groups are marked with signs: *a: significantly different from Group 1; *b: significantly different from Group 2; *c significantly different from Group 3. Mean (± standard deviation) heart total mass (HTM, g), heart total mass/body gutted mass ratio (HTM/BGM expressed in percentage), mean heart total lipids (HTLip, expressed in g per g of dry tissue), heart water loss (HWater, expressed as percentage) and sex ratio of sea lamprey individuals analysed.