Thursday, 17 November 2016

Sea Trout and Salmon Farming: New Study Demonstrates negative effects of warming waters.


Infestation of sea trout Salmo trutta L. by salmon lice Lepeophtheirus salmonis is associated with increased mortality risk and possible sub-lethal effects. Separating anthropogenic causes of infestation from background ecological variability has proved difficult. A unique 25 yr dataset was collated comprising lice counts from >20 000 sea trout sampled from 94 separate river and lake systems in Ireland and Scotland at varying distances from marine salmon farms. Statistical models were developed to explore the potential effects of distance to a salmon farm, rainfall and ambient temperature on sea trout lice infestation and body condition (weight at length). These models indicated that sea trout captured closer to salmon farms had significantly higher levels of lice infestation, and that this effect was exacerbated in warmer years. Sea trout sampled closer to salmon farms also had significantly reduced weight at length (impaired condition), with the strongest impact in dry years. The study dataset covers a broad geographic area over multiple years, and accounts for variability in temperature and rainfall. Our results imply a rather general impact of salmon farming on lice infestation and body condition of sea trout. This finding has implications for current lice control management strategies, coastal zone planning, recovery of sea trout stocks in aquaculture areas and the scale of aquaculture free zones. 

Click Here for Full Study: Interesting Study Fish Farming Areas

Sunday, 13 November 2016

Salmon and Sea Trout Tagging Regulations 2017: Public Consultation

The Tagging Regulations are open for public consultation over the next 30 days in relation to the 2017 season. There appears to be a quite sizeable reduction in surpluses available on the majority of rivers. This has become apparent over the last number of years with dwindling commercial and rod catches.



Tagging Regulations for 2017

Thursday, 10 November 2016

River Water Quality Continues To Decline: Salmon at increased risk


Outlook Progress with Water Framework Targets (EPA: 2016)
"The slow progress in improving the ecological status of surface waters means that new approaches are needed. The target of 13.6% improvement in ecological status for surface waters from the 2009 baseline by 2015 included in the first cycle RBMPs has not been achieved (EPA, 2015b, 2016a). Instead, the overall situation has not changed during the first river basin planning cycle. A radically different approach is required to target management measures to where they are needed. There is an opportunity to improve implementation under the new water governance structures recently put in place and by using the integrated catchment management approach supported by better evidence and science."