In the North Sea, Hammond et al. There have been significant declines in the European population of harbour porpoises over the last 40 years. However, a 1994 census of the North Sea and adjacent waters (known as SCANS) estimated the UK population to be 341,366 animals and noted that harbour porpoises were most densely concentrated around A further 4% (amounting to 6785 individuals) are caught in Danish nets (Vinther, 1999), and 0.6% (approximately 1000 individuals) in UK nets (Northridge & Hammond, 1999). The harbour porpoise has a global population of at least 700,000. Aerial survey data for monitoring harbour porpoise population health Authors: Sinclair, RR & Booth, CG Report Code: SMRUC-BEI-2019-003 Date: Thursday, 17 October 2019 THIS REPORT IS TO BE CITED AS: SINCLAIR, RR & BOOTH, CG. Due to its preferred habitat of shallow, coastal zones, the harbour porpoise is under threat from high levels of chemical pollution, vessel traffic, underwater noise and the depletion of prey by overfishing. Harbour porpoise bycatch in gillnets is a major welfare and conservation problem in the UK. So, whilst there might not be firm evidence that displacement will cause a reduction in population Nearly 4000 harbour porpoises of a total population in excess of 490 000 are drowned in fishing nets annually in the areas assessed. The European Atlantic and the North Sea, which includes UK waters, are considered a stock and are home to approximately 466,569 harbour porpoise, nearly half the world's total population! Disturbance Effects on the Harbour Porpoise Population in the North Sea (DEPONS): Status report on model development. ; Pollution - toxic chemicals from plastic, litter and oil spills build up in harbour porpoise seriously harming their health and their ability to have young.

In addition, there is uncertainty in relation to harbour porpoise population trends (see section 2.4). Introduction. UK status Estimating populations of harbour porpoises using UK waters is problematic because of their considerable mobility. Scientific Report from DCE – Danish Centre for Environment and Energy No. REPORT NUMBER SMRUC-BEI-2019- Where harbour porpoise presence and gillnet use overlap, bycatch appears to be inevitable. 140 .

Aarhus University, DCE – Danish Centre for Environment and Energy, 43 pp. 1. and Clausen , B. It is the most abundant cetacean species in the North Sea and the only native species inhabiting the Baltic Sea and is the flagship species of ASCOBANS.

The European Atlantic and the North Sea, which includes UK waters, are considered a stock and are home to approximately 466,569 harbour porpoise, nearly half the world's total population! (2019). The revised proportion of the harbour porpoise population utilising the suite of pSACs as a proportion of the national Management Unit population with water depths of 200m or less in the Celtic and Irish Seas Management Unit is lower than the CSG recommended sufficiency target for the population. 2008). (1993) The population structure of the harbour porpoise, Phocoena phocoena, in Danish waters and part of the North Atlantic.

Andersen, L.W.

(1994) report that 4.6% of the harbour porpoise population is lost to by-catch each year. Bycatch is recognised as a major cause of human-induced mortality of harbour porpoise. As its name implies, it is a primarily coastal species but it regularly ventures up rivers and has been seen hundreds of kilometres from the sea. 1. Population status. AERIAL SURVEY DATA FOR MONITORING HARBOUR PORPOISE POPULATION HEALTH. The UK total sufficiency fell short The UK has identified 26 sites in which the harbour porpoise is listed as a non- qualifying feature (i.e.

Marine Biology 116 , 1 – 7 . especially for the harbour porpoise. The preference for coastal habitats makes the harbour porpoise, Phocoena phocoena, vulnerable to fisheries conflicts and hence prone to die due to entangling in fishing nets.An opportunistic sampling of such casualties (134 individuals) in Norwegian waters was used to assess the genetic population structure of the species by SNP-genotyping at 78 loci. Andersen , S.H. especially for the harbour porpoise.

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