New York, New Jersey and Delaware were accused in federal lawsuits Thursday of improperly allowing Atlantic sturgeon to be killed by commercial fishing operations even as the prehistoric fish is on the brink of disappearing.The three parallel lawsuits filed by the Delaware Riverkeeper Network and Hudson Riverkeeper accuse the states of violating the Endangered Species Act by not obtaining necessary permits that allow commercial fisheries to catch and kill Atlantic sturgeon while they fish for other species such as striped bass and summer flounder. The environmentalists say the once thriving fish’s recovery is threatened because they are unintentionally caught in commercial nets as “bycatch.”