Plankton analysis data from a single survey carried out between Sept-Oct 1987
by the Centre for Environment, Fisheries and Aquaculture Science in order to
investigate the distribution and abundance of yolk sac herring larvae on the
spawning grounds east of the Isle of Man. Plankton samples were collected at
each site on a planned survey grid. This data consists of the numbers of
herring larvae, along with associated positional data and volumes filtered.