[By Steinar Brandslet and Frid Kvalpskarmo Hansen]
Sea trout numbers are declining in Norway and scientists don’t know why. They have studied the trout in two rivers in northern Norway’s Nordland county. Soon, sea trout along the entire Norwegian coast will be investigated.
Sea trout get no peace. They’re constantly exposed to new diseases and ailments, many of which are due to climate change and human activity.
Now researchers want to find out which diseases are affecting the fish so they can know how to help them. The researchers plan to explore the entire coast of Norway, but have started on a smaller scale.
“We’ve investigated viruses, bacteria and parasites on 160 sea trout in the Skjerstadfjord and the Tosenfjord in Nordland county,” says associate professor Jan Grimsrud Davidsen in the Department of Natural History at the NTNU University Museum.
The research group searched for 46 different disease-causing factors, so-called pathogens, and found 11 of them.
“The most important thing was that we found out the method works. But we didn’t really find much disease in the fish in either the Skjerstadfjord or the Tosenfjord,” says Davidsen.
The researchers had to use an analysis method developed for fish in the Pacific Ocean – because that was the only existing option. It wasn’t an ideal solution.
“We think the analysis results weren’t completely accurate, because we didn’t screen for the correct pathogens. The problem is that we don’t quite know what diseases we’re looking for. Currently we still know very little about which pathogens affect sea trout on the Norwegian coast. But we hope to learn more about that in the follow-up project to map the entire coast,” Davidsen says.
The studies of the two rivers in Nordland were a pilot project. The researchers have now received 1.1 million Euros from the Research Council of Norway to continue and expand the project, starting this summer.
Investigating the entire Norwegian coast
In the next few years, the research institute NORCE, the Institute of Marine Research, NINA, fisheries authorities in Canada and the NTNU University Museum will map the spread of sea trout diseases and parasites along the entire Norwegian coast.
“Using a new DNA method, the researchers can check the samples for traces of 90 different viruses, parasites and bacteria. So far, we’ve looked at data that we had already collected. Now we’ll be collecting the first new data from the Beiarfjord in Nordland and a fjord in Western Norway,” says Davidsen.
The researchers plan to tag 150 fish with traceable electronic tags.
“Then we’ll be able to examine both the activity level and the migration pattern of the fish, to see how diseases affect their behavior and energy consumption,” he says.
Fish must be tagged electronically so that researchers can track them. Photo: Sindre Håvardstein Eldøy / NTNU
ID tags and listening stations
In practical terms, the researchers take a cell sample from the gills of the sea trout, which are fitted with electronic ID tags. The gill sample is only the size of a pinhead, but yields a lot of information that is quite fascinating.
“Using a completely new DNA method, we can screen this sample for traces of 90 different viruses, parasites and bacteria,” says Davidsen.
Scientists on a cruise to monitor sea trout. Photo: Åge Hojem / NTNU University Museum
These analysis methods are the most advanced available and will enable the researchers to detect whether the sea trout is just a carrier of the disease or is actually sick.
“We can link this information to sea trout behaviour. We register their behaviour using the electronic ID tags and listening stations that we set up in the fjords. Then we can see if sea trout with various diseases or parasites behave differently from other sea trout.
So why is this research important?
“Sea trout in Norway and the rest of Europe are in decline. The main reason lies in the ocean. We know very little about the effect of pathogens, and it’s important to find out the role they play,” says Davidsen.
The aquaculture industry in Norway is growing. We know that this also contributes to an increase of pathogens in wild fish, and so it is important to find out what effect they have on sea trout. Researchers have already determined that salmon lice have an effect on wild fish. Now it is high time to look at other diseases and parasites as well.
“If we figure out what is afflicting the wild fish the most, we may be able to do something about it. Maybe this knowledge will help us build up the sea trout population again,” Davidsen says.
This article appears courtesy of Gemini News and may be found in its original form here.
Go to Source
A massive fire broke out at the Port of Beirut on Thursday, incinerating a warehouse full of tires and oil within the port’s free zone. The same area was heavily damaged in the ammonium nitrate explosion that leveled the central port area and the adjacent waterfront on August 4. According to Lebanon’s civil defense agency, […]
Over the course of the past five days, the Australian Maritime Safety Authority arranged a medical intervention for an injured aboard a freighter in the Indian Ocean. On Saturday evening, the Spliethoff tweendecker Dolfijngracht called for assistance while under way about 1,000 nauical miles off the coast of Western Australia. A crewmember had sustained serious […]
The naval forces of the US and Bahrain recently staged a joint force training exercise which showcased the interoperability between coalition warships operating I the Arabian Gulf. Coalition Task Force Sentinel executed combined exercise Sentinel Shield supporting Sentry and Sentinel patrols in the coalition’s area of operations. The guided-missile destroyer USS John Paul Jones and […]
DSV Belgium has solid experience in the transport of pharmaceutical products for different customers. With a pharma hub based at Brussels Airport a lot of experience and know-how has been built up over the years. Last weekend, the forwarder handled one hundred million mouth masks, an important milestone for its Belgian organisation that has put […]
With close to 100 daily cargo flights operated to a destination network spanning more than 65 cities across six continents, Emirates SkyCargo is delivering essential supplies and commodities to people around the world. The air cargo carrier is currently operating 11 Boeing 777 freighter aircraft, each with a capacity to transport about 100 tonnes of […]
The UK government’s new post-Brexit tariff regime will result in both winners and losers. The new regime is set to replace the European Union’s Common External Tariff from the end of the Brexit Transition Period on December 31, 2020. The UK’s commitment to the ongoing Brexit process and ending the UK’s transition from EU membership […]
The U-Freight Group (UFL), with its considerable involvement in eCommerce logistics, says that the latest statistics showing that global e-commerce sales hit $25.6 trillion in 2018 are a further vindication of its decision to enter this sector of the international freight market several years ago. The latest available estimates, up 8% from 2017, were recently […]
The National Transportation Safety Board (NTSB) has released a Marine Accident Brief about an accident that occurred on April 15, 2019, involving the towing vessel DeJeanne Maria which struck the end of a submerged dredge pipeline while pushing two spud barges to the Gulf of Mexico. The incident occurred on the Mississippi River in Pass […]
Best known as a leading passenger airport serving Germany’s most populated federal state North Rhine-Westphalia, Düsseldorf has become transformed into a vital distribution point, during the COVID 19 pandemic, for medical equipment and other life-saving goods, mostly from China. Gerton Hulsman, managing director of cargo operations, reports that the handling teams are working hard to […]
Astral Aviation has increased its intra-African network with cargo freighters during the pandemic. While there has been a reduction in capacity to, from, and within Africa, which has been caused by a stoppage of passenger flights and limited frequencies on freighter aircraft, Astral Aviation continues to operate cargo freighters from its Nairobi hub to 13 destinations […]
Global commercial aviation charter company Albion Aviation Group is reporting that it is seeing a considerable uptake in its professional cargo broker training courses from the current global pandemic crisis and surge in charter demand. “We have completed a number webinar courses for a whole of host of companies, looking to manage their own cargo […]
Emirates SkyCargo has expanded its weekly scheduled cargo flight operations to cover 75 destinations across six continents. Through its wider reach, Emirates SkyCargo is able to transport essential commodities and other urgently needed cargo more rapidly across the world, allowing exporters and importers across markets to benefit from direct access to widebody cargo capacity. Some […]
Operators can continue to use pilots and other crew members who have unable to comply with certain training, recent experience, testing, and checking requirements due to the COVID-19 outbreak in support of essential operations. Additionally, this Special Federal Aviation Regulation (SFAR) provides regulatory relief to certain persons and pilot schools unable to meet duration and […]
Callan Marine is serving as the prime contractor to the Texas Department of Transportation for a maintenance dredging project located at the Bolivar Ferry Terminal, in Galveston, Texas. Work began in May and is estimated to be complete in late July 2020. The project consists of the removal of 600,000 cubic yards of material and […]
Network Airline Management and TAAG Angola Airlines are pleased to announce the renewal of their long-term freighter aircraft contract by an additional 12 months, sealing an ongoing partnership for the foreseeable future. Operating a regular weekly scheduled service from Liege, Belgium, to the capital of Angola, Luanda, Network Airline Management provides a Boeing 747-400F aircraft […]
Qatar Airways Cargo transported 56 SkyCell containers with vaccines from one of the largest vaccine manufacturers worldwide on its scheduled freighter and belly-hold cargo flights for its customer, CEVA Logistics. The 54-tonne shipment consisting of pneumococcal and varicella vaccines were flown from Brussels to Mumbai via the carrier’s hub in Doha on two separate flights. […]