Tiny invertebrates whizzing around the surface of shallow sea water causing these ripples
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The commonest Isopods seen swimming in shallow sea / rockpools are various species of Idotea, slim elongated creatures with obvious antennae, but there are other possibilities and I'd need to see more than the ripples to be sure.
Nick Upton, naturalist and photographer.
I was thinking more of Sphaeroma or Eurydice which are quite zippy.
They could be from these genera also, or Dynamene, it's hard to say with just the traces to go by! I once encountered a dense aggregation of Eurydice (pulchra I think) in shallow water off North Wales, which took to nipping my calves.. Must have eaten everything else..
Lat/Lng: 56.645, -5.2985
OS grid ref: NM978552