The above figure was the summary of Joshua's results. Note that the thinnest fish on average were Black Drum in Calcasieu. Joshua concluded that the increased oystering in Calcasieu is having a more negative impact than the loss of oysters in the Lafourche area due to the oil spill. Since the Black Drum's food supply in Calcasieu has been greatly reduced, the fish are much thinner than the long term Louisiana average. Harvesting all the Black Drum you catch will both help the oysters recover more quickly and also leave more food for the remaining Black Drum. It will also leave more food for the redfish, as in the absence of oysters, Black Drum eat a lot more crabs and are a much stronger food competitor with the redfish.
Also note that the redfish and spotted seatrout are also thinner than expected in Calcasieu. This suggests that relative to the abundance of redfish and spotted seatrout, there is less to eat than the long term Louisiana average.