It depends on the MPA and the specific objectives. Science shows that those no-take areas are most effective, but I was talking about the fact that in MPAs that allow some fishing but still provide more protections than areas that are not within MPAs, they still provide additional benefits over and above conventional fisheries management. So it's not like MPAs that allow fishing are not effective at all; they're just not as effective as no-take areas. Partially that's a trade-off that needs to be discussed in specific MPAs and specific places.
All fishing does impact the ecosystem. Science shows that. That may be a trade-off that in that place is appropriate to make so that those sustainable fisheries can continue.