Dolphin deaths in Ireland at record levels in 2017 UPDATE - 17 FEB 2017

17th Feb 2017

UPDATE 17 FEBRUARY 2017:

Unfortunately, IWDG can now confirm that up to today's date, 2017 is the worst year on record for cetacean strandings in Ireland and, as has been the trend since 2011, much of this increase in total strandings is down to persistent high levels of common dolphin deaths during January and February, especially on the south and west coast. For interest, below is a small section of an article we published here on this website in early March 2016;

There has been much interest both in ‘traditional’ media (newspapers, radio etc.) and in social media in the results presented by the IWDG showing the large increase in reported strandings (and we continue to point out that these number may be only a small percentage of actual common dolphin deaths) but what now? Based on other years, it is difficult not to be somewhat cynical and think that the number stranding will ease off, attention will focus elsewhere and we’ll be back here with the same story in 2017. This is simply not acceptable and action must be taken.

Little did we think that the situation would not just be as bad but actually worse. So far this year, 56 cetacean strandings have been recorded with 29 (52%) of these identified as common dolphins. Previously, 2013 had the highest number of strandings early in the year with 48 records to 17 Feb of which 28 (58%) were common dolphins. In the years prior to 2010, average numbers of strandings at this time of year were around 22 of which 5 would have been common dolphins. During the week, IWDG met with stakeholders from government agencies and representatives from the Irish and foreign registered fishing fleets in an effort to work out what exactly is happening to cause such changes at this time of year. There is a disconnect somewhere as internationally accepted visual evidence of bycatch is seen in some strandings, and post mortem reports on 5 common dolphins in Mayo in 2013 reported that their deaths were likely to be due to bycatch in a pelagic trawl net - yet Irish and EU observer schemes involving pelagic trawlers reported no bycatch in commercial pelagic hauls.

ORIGINAL STORY:

As I sit here by the desk, I can't help but feeling like I'm in a movie - unfortunately for dolphins in Ireland, the movie in question is Groundhog Day, because last year feels like yesterday, watching a steady stream of dead dolphin reports and thinking "will I be sitting here this time next year watching the same thing?". Unfortunately, the answer is no because at 42, total strandings to 6 February 2017 are around 30% higher than 2016 and are second highest on record with only 2013 being higher (45). As has been the case since 2013, the biggest losers are common dolphins and one would have to start wondering at what stage they may become 'uncommon' dolphins.

Credit: Sandy Alcorn Credit: Sandy Alcorn

Up to 2011, we would have expected between one and seven common dolphin strandings in the first five weeks of the year but in 2013 the figure was 27 and in 2017 stands at 22. What we must keep stressing is that this is only a figure for recorded strandings, not including those that never wash ashore or go unreported despite stranding. One study suggests that as little as 8% of dolphins dying at sea are actually recorded. Before 2011, the highest annual total of recorded strandings of cetaceans in Ireland was 147 but this has risen to between 176 and 219 over the last five years. So, the obvious question is why? And the rather pathetic answer is, we don't know, even though this has been an annual occurrence for the last five years or so.

Credit: Clare Scott

There is no doubt in our minds that fisheries bycatch related to offshore pelagic trawling in winter/early spring has a part to play. Post mortem results from Co. Mayo in 2013 when there was an unusually high number of dead common dolphins washed ashore, confirmed that deaths were consistent with fisheries bycatch. Also, injury and damage to some carcasses is consistent with bycatch eg broken beak as in the picture above and this is coincidental with a large fishing effort by various countries in the waters around Ireland at this time of year. IWDG accept that there is a 'normal' level of strandings from various causes ie sickness, injury, old age etc but we are concerned at the increase in strandings over the last five years and the apparent lack of determination to establish the cause(s) in what is, if nothing else, a legally protected species. Several recent live and dead strandings also show signs of emaciation but is this due to illness or lack of food? Until there is a scheme in place in Ireland to post mortem freshly dead cetaceans with a view to establishing the cause of death, it is impossible to adequately protect these animals because without knowing the 'why', little else is possible. If you establish causes of death then, for example, you learn if it is worthwhile to refloat live stranded animals. Likewise, if you learn the impact and extent of interaction with different types of fisheries, only then can you look at putting workable mitigation measures into effect. In a way, perhaps the biggest threat to cetaceans in Ireland is not what people are doing, but what people are not doing. It's surely time to stop just ticking boxes and start trying to figure out what the actual problems are.

Mick O'Connell,

IWDG Strandings Officer

Cover Photo: Clare Scott.