Morning Tide Mackerel by Victoria Walker (UK) in St.Ives Harbour, Cornwall, UK This huge shoal of mackerel forgot to check the tide tables! Caught out by the spring low tide in St Ives harbour, hundreds were stuck for a few hours until the tide came back in. I’d been out for a swim, when I came upon this event. The local fisherman told me it was very rare so I slowly immersed myself into the pool to capture the spectacle. I had to sit very still not wanting to panic the fish, after just a few minutes they were swimming all around me.