Obviously JF Aus you have never been on a boat on the east coast of Oz. You are talking the same kind of greenie bull as the global warming scam.

I have sailed 7 Hobart races as a navigator. Knowledge of the currents is critical top performance. I have sailed Sydney to to the northern reef more times than I can count, & know which way the free ride of current flow runs.

Many years ago Jim Hardy when briefing a bunch preparing for a Sydney Brisbane told the assembled to sail in close to the beaches to get out of the south going current. Answering a question about how close in his answer was, "If you can't hear the dogs barking, you are to far out"

I spent years running tourists around the reef, & gained a lot of information from the professional reef fishermen who spends most of their lives "out the Swains", & other good fishing grounds. I suggest you try talking to some of them, rather than academics who rarely see actual reef, but spend their time mucking around with big fish tanks in Townsville & other places.

Scientists only ever study something that results in more funding for scientists. I wonder if any of them ever studied the effects of antifouling paint instead of just blaming the farmers for polluting the waters with pesticides ?
If Govt were really as concerned as they proclaim, why don't they offer facilities to clean boat hulls rather than use antifouling ?
Climate is uncontrollable but pollution can be curbed !

You are drawing a long bow there Indyvidual, & granting paint chemists more ability than they deserve.

I used to have to pay a small fortune to divers to scrub the bottoms of the 320 passenger high speed International Catamarans starting less than 3 months after their annual dry docking & anti fouling. The marine growth on the anti fouled bottoms would start after 8 or 9 weeks, & be heavy enough to have dramatically boosted fuel consumption after about 9 weeks.

The permitted anti fouling coatings just aren't that effective against marine organisms.

Hasbeen,
Would prop speed be less harmful or is the production of it also highly polluting ?

The doomsayers have been telling us we are about to run out of food for the pat 250 years. They were wrong then. They are wrong now. They've always been wrong.

We have more food now PER CAPITA than at any time in history. Yet the doomsayers plug away, unconcerned with their previous erroneous claims (likely most of them are blissfully unaware of them) and when those claims fail to materialise, they'll continue to plug away with new an just as erroneous claims.

Its comforting to see consistency in the world.

It's amazing to observe that supposedly educated people are dumbed down.

Toxic antifouling was abandoned about 40 years ago and replaced by ablative antifouling that has a weak surface, causing marine growth to fall off instead of being poisoned by toxic antifoul.
Hardness of ablative antifoul is determined during purchase linked to prop speed and power, soft antifoul for slow craft, hard antifoul for fast vessels.

IGNORANCE OF FOOD AVAILABILITY MIGHT BE A SIN.
Fish used to be abundant and free.
Fish and chips used to be a staple for poor people but now due to high cost of fresh healthy fish, not the antibiotic aquaculture type, fresh fish is now a virtual luxury.
My God how dumbed down can people get?

Affordability of fresh fish is linked to available supply and intake of ESSENTIAL affordable protein DAILY including for whole families.
Fish cost on the CPI has been tweaked to hide reality of impact on the economy.

Mass starvation of seabirds has been occurring. Emaciated whales are washing up worldwide.
Search: whales starving.
Search: seabirds starving.

In Solomon Islands the fish commodity based barter system has generally collapsed leading to hardship and unrest resulting in CCP security being invited into the region.

Various nations are having to travel vast distances to find and catch fish these days.
Search: China fishing fleet.

Increase in NCD and early death among seafood dependent Island people, stunting, stillbirth, small babies, and need for a special operating theatre for Diabetes II amputations ONLY, all coincide with fish depletion involving amino protein deficiency undernutrition in Solomon Islands (and I think elsewhere).

Search: diabetes II malnutrition undernutrition.

Wake up MSM.