Images from the Roa Island shore walk (August 14th 2013)

Presented by Lewis Bambury at Capernwray Dive Centre, this talk reviewed some of the photographs taken on the shore walk at Roa Island in July, and put this into the broader context of our previous surveys of this area.

Parasite Lernaeenicus sprattae shown on a juvenile spratt, and after removal

The parasite Lernaeenicus sprattae shown on a juvenile spratt, and after removal

One of our mystery organisms (pictured) was a parasite on one of the juvenile spratts caught in the rock pools. Lewis had narrowed it down to probably being a copepod, and this was confirmed by David Fenwick and Mike Moon, who identified the species as Lernaeenicus sprattae. Commonly seen on Spratts in UK waters, it gets its name from its preferred feeding mode, attached to the eye of the unfortunate fish. Extensive parasitism is possible, and this can result in considerable deterioration in the health of individual fish. The two green appendages are egg sacks.

Some of the other organisms featured in the talk are shown int he gallery below, alongside some photos taken underwater on the same site:

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