Table 11.23 Impact of instantaneous injury as a result of construction noise Receptor Group


Mobile life stages/ Species Early Life Stages


Species of Limited Mobility- Gobies


Species of Limited Mobility- Sandeels


Species of Limited Mobility- Shellfish


Medium Medium


Medium Low


Receptor sensitivity Magnitude of Effect Low


Negligible Low Low


Negligible Negligible


Impact Significance Negligible Minor Minor


Negligible Negligible


11.6.1.3.2 Behavioural Disturbance 149. Avoidance and behavioural responses to underwater noise could result in decreased feeding activity, the potential avoidance of spawning grounds, and as a potential barrier to migration.


150.


Impacts on feeding activity are unlikely to cause long term, larger scale effects on fish populations given the wider availability of suitable feeding grounds in the region. There is concern however that behavioural responses, such as avoidance, could have an adverse impact on spawning behaviour and migration of certain species.


151. Assessment of behavioural responses to underwater noise has been undertaken for the following species on the basis of overlap of the 168dB contour with spawning grounds (3,500kJ hammer energy), the commercial importance of a species, species conservation status and specific concerns raised during consultation with Cefas and Natural England (10/09/2013). As given in Table 11.21 and Table 11.22 startle response ranges are substantially smaller than those modelled for behavioural disturbance and are therefore encompassed within the ranges modelled for behavioural disturbance.


• • •


Sole;


Plaice; Cod;


• Whiting; • •


Lemon sole; Herring;


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 11 Fish and Shellfish Page 61


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