The latest controversial proposal to weaken protections for the striped bass, a popular Delta sport fish, is scheduled to be heard on Thursday by the California Fish and Game Commission.Water users mostly south of the estuary asked the commission earlier this year to allow more of the fish to be caught, in order to reduce their numbers. The water users argue that stripers — which were introduced to the Delta in the late 1800s — chomp down on native fish species, which in turn reduces the amount of water that can be pumped south.A similar proposal was rejected in 2012. Now the battle is on again. State officials say they have received nearly 3,500 comments opposing the changes, and fishermen are expected to attend Thursday’s meeting in large numbers.