113. As shown by Figure 11.56, the area of East Anglia THREE project does not overlap the main sandeel habitats (shown as black areas in Figure 11.56) depicted by Jensen et al. (2011). As discussed above, in view of the minimal spatial overlap and the short duration of the effect, the magnitude is assessed as low, giving an impact of minor adverse significance.
11.6.1.2.4 Changes to Composition of Demersal Spawning Grounds 114. Sediment re-deposition could result in changes to the particle size distribution of the sea bed giving rise to some loss of spawning grounds for substrate specific demersal spawning species such as herring. High suspended sediments could also have the potential to deter spawning adults from entering traditional spawning areas.
115. Other than sandeels, (discussed above), herring are the only demersal spawning species within the vicinity of the East Anglia THREE project. The East Anglia THREE project however does not overlap with defined herring spawning grounds (Figure 11.58).
116. As sediment re-deposition is localised and the demersal spawning grounds of the Downs herring stock do not overlap with the East Anglia THREE project, there is no potential for an impact to occur (i.e. no Impact).
11.6.1.2.5 Increased SSCs in Pelagic Spawning Areas 117. A limited number of spawning areas of pelagic spawning species overlap with the East Anglia THREE project. These species do not however have the same level of spatial dependency on a specific substrate unlike herring. Pelagic spawning species, in terms of potentially indirect effects on their spawning grounds are therefore considered to have a low sensitivity. As discussed above, the magnitude of the effect is low, giving a significance of a minor adverse impact.
118. Table 11.20 summarises the potential impacts of increased SSCs and sediment re- deposition.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 11 Fish and Shellfish Page 52
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