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AusMoz said..
What the hell is that crudd your sailing through? Just weed?
As best I can find out it's mostly an algal mat at this time of year. There is also free floating weed and bottom growing weed debris.
As summer marches on, the water gets hotter and more saline, and along with lower tides the mat dies off, and we are left with just the bottom growing stuff.
If the mat gets too dense for a long period, the mat stops sunlight reaching the bottom growing weed, it dies off and the area becomes a sandpit. It then takes 4-5 years for the bottom to be re-colonised.