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Fig. 5. On rare occasions a phenomenon termed `plume ventilation' was seen, which
caused significant temporal and horizontal variations in the sediment oxygen
distributions. Here the fish (arrow) made a wriggling body movement, which
channelled oxygenated water down along the body creating a `pocket' of
oxygenated sediment around the fish. The plume, which typically lasted
20–30 min (the time before anoxic conditions were re-established around
the fish), penetrated into the interstice as the oxygenated water was
replenished by oxygen-depleted water leaving the gills. The oxygen was
gradually consumed by microbes and chemical oxidation processes during
sediment percolation.
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