A Gulf of Mexico expedition at the Flower Garden Banks and nearby artificial reefs resulted in 157 invasive lionfish being removed by 30 divers. As The Galveston County Daily News reported, the expedition is easing pressure on one of the region's key coral reef ecosystems. What happened? Lionfish have no natural predators in the Gulf, so divers targeted them directly on the second of three planned Lionfish Invitational research trips. The Daily…