{"id":304,"date":"2013-03-12T12:34:31","date_gmt":"2013-03-12T12:34:31","guid":{"rendered":"https:\/\/lochduart.com\/?p=304"},"modified":"2013-03-12T12:34:31","modified_gmt":"2013-03-12T12:34:31","slug":"ending-the-confusion-about-salmon-and-sea-lice","status":"publish","type":"post","link":"https:\/\/lochduart.fr\/ending-the-confusion-about-salmon-and-sea-lice\/","title":{"rendered":"Ending the confusion about salmon and sea lice?"},"content":{"rendered":"<p><a href=\"https:\/\/lochduart.com\/observations\/?attachment_id=165\" rel=\"attachment wp-att-165\"><img loading=\"lazy\" decoding=\"async\" alt=\"sealice\" src=\"https:\/\/lochduart.com\/observations\/wp-content\/uploads\/2013\/03\/sealice.jpg\" width=\"632\" height=\"148\" \/><\/a><\/p>\n<p>As an interested observer and admittedly firmly on the side of aquaculture and salmon farming in particular, I\u2019ve always been puzzled by the sea lice argument.<\/p>\n<p>Opponents of salmon farming blame salmon farms for producing the sea lice that infect and kill wild fish. They claim this is a major cause of the decline in wild stocks.<\/p>\n<p>The first part of the puzzle is \u2018where do the sea lice come from in the first place?\u2019.<\/p>\n<p>The 16 month old smolts that are put to sea certainly don\u2019t have any sea lice. They have been raised from eggs in freshwater where sea lice do not exist. So, there are no sea lice on them when they are put to sea.<\/p>\n<p>The sea conditions are likely to be pristine at the outset. In the case of Loch Duart, the loch has been fallowed for 12 months and sea lice cannot hang around for a year waiting for a salmon farm to be set up.<\/p>\n<p>This rather leads to the conclusion that the initial problem is likely to be the reverse of what we are generally told i.e. that the initial infections are the result of wild fish infecting farmed fish.<\/p>\n<p>This is logical. One of the ever-present vulnerabilities of farming of all types is that the concentration of livestock means that disease problems can be quickly magnified once they are introduced, as we know from foot and mouth and, more topically, Schmallenberg disease.<\/p>\n<p>So, once wild fish have infected the farm stock, it\u2019s easy to see why some people might think that sea lice concentration could make farm sites dangerous places for passers-by.<\/p>\n<p>It is helpful therefore, that two research studies, one in Ireland and one in Norway, both over extended periods of time, have addressed the second part of the puzzle \u2013 the issue of \u2018what happens next?\u2019.<\/p>\n<p>Both studies have now confirmed that sea lice are not the major factor in wild salmon mortality \u2013 and not a significant factor at all. The Irish study has concluded that sea lice account for no more than 1% of wild salmon mortality and the Norwegian study is in broad agreement. The Irish conclusions were published in the peer-reviewed \u2018Journal of Fish Diseases\u2019 and included the statement: &#8211;<\/p>\n<p><i>\u201csea lice represent a minor and irregular component of marine mortality in the stocks studied and are unlikely to be a significant factor influencing the conservation status of salmon stocks\u201d<\/i><\/p>\n<p>The methods used to reach these conclusions seem to be quite sophisticated and the time taken over the studies (nine years in Ireland, eight years in Western Norway) cover the complete salmon life cycle more than adequately. You can see abstracts of the peer-reviewed papers published as a result of these two studies at<a href=\"http:\/\/www.ncbi.nlm.nih.gov\/pubmed\/23298412\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/www.ncbi.nlm.nih.gov\/pubmed\/23298412<\/a>\u00a0(Ireland) and<a href=\"http:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/jfd.12052\/abstract\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/jfd.12052\/abstract<\/a>\u00a0(Norway) \u2013 contact<a href=\"mailto:janeanne@lochduart.com\" target=\"_blank\" rel=\"noopener noreferrer\">janeanne@lochduart.com<\/a>\u00a0if you would like to see the full articles.<\/p>\n<p>&nbsp;<\/p>\n<p>Not much has been heard from the opponents of salmon farming since these reports have been published. There seem to be two main types of opponent \u2013 activists funded by foundations funded by the so-called \u2018wild\u2019 Alaskan salmon fisheries, and fishing associations representing fly fishermen who for years conspicuously slaughtered more salmon than they could eat, lining up their catches in rows along the river banks. Today they release a percentage of their catch \u2018sustainably\u2019, allowing exhausted and damaged fish to continue their long and arduous journey upstream.<\/p>\n<p>Perhaps these vested interests will find more to say at some stage \u2013 but it\u2019s good that the sea lice argument has been put into its true perspective by objective and independent scientists.<\/p>\n<p>Does that mean the debate is over?<\/p>\n<p>Let\u2019s wait and see\u2026<\/p>\n<p>&nbsp;<\/p>\n<p>Tim Mott<\/p>\n","protected":false},"excerpt":{"rendered":"<p>As an interested observer and admittedly firmly on the side of aquaculture and salmon farming in particular, I\u2019ve always been puzzled by the sea lice argument. Opponents of salmon farming blame salmon farms for producing the sea lice that infect and kill wild fish. They claim this is a major cause of the decline in wild stocks. The first part &#8230; <\/p>\n<div><a href=\"https:\/\/lochduart.fr\/ending-the-confusion-about-salmon-and-sea-lice\/\" class=\"more-link\">Read More<\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ending the confusion about salmon and sea lice? - Loch Duart<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lochduart.fr\/ending-the-confusion-about-salmon-and-sea-lice\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ending the confusion about salmon and sea lice? - Loch Duart\" \/>\n<meta property=\"og:description\" content=\"As an interested observer and admittedly firmly on the side of aquaculture and salmon farming in particular, I\u2019ve always been puzzled by the sea lice argument. 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