A popular Delta sportfish may be on the hook yet again after water users mostly south of the estuary asked state officials this week to allow more of the fish to be caught, in order to reduce their numbers.A nearly identical proposal, ardently opposed by Delta fishermen, was rejected in early 2012 by the state Fish and Game Commission.But the water users didn’t stop fighting. Their concern is that stripers, which are technically not native to the Delta, gobble up threatened and endangered fish. And the decline of those species has reduced the amount of water that can be pumped to southland cities and farms.