If you don't breach the lagoon, you'll lose the run of fish....

If you don't breach the lagoon, you'll lose the run of fish. There are arguments both ways. If you breach it too early, the younger fish are going to die because they're not mature enough and will get sucked out into the ocean, but if there's a drought year, you're going to have to open it up during their spawning cycle so they can get into the river.