Thanks.
These all span over the last 6 months (only been shooting properly since November 2011) so they were either taken on a Nikon 60mm AF-S or a Sigma 105mm HSM OS macro. As for settings, there's no one setting that works across the board so they would have varied tremendously but for fish 1/500, f4, ISO 800 works for me (depending on the area I'm shooting in.)