[Trenemene]

Tazzie, I know. But I'm here now!

I'm not sure you necessarily need to fully understand why things are happening but I believe it helps if you try to be aware of your surroundings. If you dive somewhere fairly frequently, does the marine life change ie sometimes it's there and sometime it's not? Is there a pattern to when it appears or disappears? It could be seasonal, water temperature, tidal flow, high water, low water, presence of other wildlife (predator or prey) or some other 'local' factor.

For example virtually every wreck in Devon and Cornwall will have a shoal of bib on it somewhere. Dive the wrecks in Scilly and there are none. Why? Who knows but it may be something to do with the topography on Scilly where there are plenty of reefs for fish to hide or hunt. On a wreck like the Elk in Plymouth, it's on a sandy bottom with no alternative shelter for some distance. The stern is usually teaming with bib.