Anglers, lobstermen and state officials are seeking public support for a bill that would require Maine saltwater fishing licenses. Under Rep. Leila Percy’s bill, the licenses would cost $15, but children under 16 and residents 70 and older, and those fishing from charter boats, would be exempted. Representatives of several groups held a news conference in Augusta on Wednesday to say the state’s under the federal government’s gun to require licenses. A new federal saltwater recreational fishing registry is free this year, but it could cost $25 next year if the state fails to create its own. Percy, a Phippsburg Democrat, says the federal government wouldkeep the license fees if Maine does nothing.