Hi Mark,
Just wanted to check if any current research, such as diving the existing reef balls west of Peel was conducted before spending more money on new ones. I have sounded over and fished the balls many times since they were first placed. Unfortunately, from my experience, they are not big enough. Initially when they were placed there was a bit of bait starting to appear, which in turn brings larger fish. However, since they are very small (80cm high in up to 15m of water) they are easily silted up, rendering them ineffective. It is great to see something being done, but I just think we could have got a lot more bang from the dollars spent. Reef balls twice or even three times the size should have been used - even if this meant there were fewer of them. History tells us that structure holds fish. Just look at the HMAS Brisbane. Now I'm not suggesting we need to put something that large west of Peel, but substantial structure would be many time more valuable in creating a new ecosystem and not little dots of concrete all over the place.
Cheers,
Ben