Sea Squirts or Tunicates exist in staggering profusion in certain locations. Here in a sheltered sea loch, the steep walls are covered in this particular variety, Ciona intestinalis. The colour of the water is an indication of why they are there. Suspended plankton and organic material make the water this colour which is a rich food source for these filter-feeding animals.
Growing to just about 12cms in height, they can be found all around Britain wherever there is limited tide or wave action and are particularly attracted to docks and piles.
Loch Hourn, Western Scotland