Summary of relative spawning success and behaviour of NT and T coho salmon reared in a semi-natural mesocosm or natural systems, in three different competition experiments (No, Full, and High Male Competition).

NT = wild-type coho salmon. T = growth hormone transgenic coho salmon. Meso = reared in a semi-natural 350,000 L seawater tank from smolt. Nature = reared in natural systems from smolt. Spawning success = proportion of offspring contribute to, of individuals that spawned, and of mates spawned with. Spawning behaviour = aggressive, courtship (attending, quivers, gapes), and digging behaviours.