I have heard that net pens in general have negative effects such as disease, sea lice, etc..even if they are raising native species. However, as others have pointed out, the business still exists within tribal management practices in many areas. I also used to see many of these operations in BC waters when fishing up there. Is the real motivation based on commercial tribal and non tribal interests fearing competition? Since there is no political will to really limit commercial fishing (including anyone else making a living on fishing), wouldn't net pen rearing relieve the pressure on wild and hatchery fish?