He also harvests giant kelp from Akaroa harbour for kelp pepper and organic fertiliser.

The fronds ripple and waver like giant kelp, but are thicker and more purposeful.

Facebook Twitter Pinterest Tasmania's remaining giant kelp forests appear to have been more resilient to the heatwave.

The sea is a vast reservoir of potash, and seaweed, especially the giant kelp, absorbs large quantities of this potash.

Above a winding road they swam and then through a forest of giant kelp, which abruptly opened up upon a shining white city.