Swimming capacity and energetics of migrating and non-migrating morphs of three-spined stickleback Gasterosteus aculeatus L. and their ecological implications
Tudorache, C.; Blust, R.; De Boeck, G. (2007). Swimming capacity and energetics of migrating and non-migrating morphs of three-spined stickleback Gasterosteus aculeatus L. and their ecological implications. J. Fish Biol. 71(5): 1448-1456. dx.doi.org/10.1111/j.1095-8649.2007.01612.x
The two morphotypes (leiurus and trachurus) of the three-spined stickleback Gasterosteus aculeatus, caught at the same location and time in the River Scheldt (Belgium), were investigated for physiological differences in swimming capacity and energetics associated with migration. Critical and optimal swimming speeds, maximum speed and gait-transition speed were significantly higher for the trachurus type. Standard metabolic rate and active metabolic rate were also higher for trachurus, as was scope for activity. Energy stores (protein, lipid and glycogen in liver and white muscle) were mostly similar in the two types, but lipids in trachurus liver tissue were significantly higher.