I never could see a difference of more or less whales or dolphins or porpoises on the prospect. I think if any are irritated by the noise it’s only a few and they move on. It’s not like the crew is transiting across the ocean at 30 kts and sneak up on a pod. It’s been s little while but the last time I was doing seismic we had to have at least one gun popping during line changes in case something would sneak up on us at 30 kts.
I did have a MMO onboard who was convinced that they were being harmed. Said she saw a pilot whale swimming alongside with a confused look on its face, LOL. She was twice the age of the average MMO and probably had underarm hair. She would not be a good source of information.