. >> reporter: but san francisco baykeeper science director jon rosenfield says it's a lot more thaneed cold water to survive, but the state water board refused to enforce its requirements for cold water flows. and so a lot of salmon died. >> reporter: rosenfield says state leaders are keeping the river flows too low and they're exporting too much water to southern california. >> salmon fishing season was closed last year. and yet the number of salmon that returned was still historically low. commercial fishermen and recreational boat operators are taking it on the chin. >> reporter: while juanes waits for the salmon population to recover, he's putting all his efforts into crabbing. >> since the season opened, i think we've been -- i have been home probably ten days since january. >> reporter: despite difficult times, he says he's not ready to give up on something he loves. >> i'm a fisherman and so i'm going to go until the ship sinks basically. going all the way down with it. >> this is only the fourth time in history that all commercial salmon fishing in california will be closed