The parasite is found in large numbers in the lumpfish, which is now considered to be one of the primary hosts of the parasite. The lumpfish in turn infects several types of farmed fish when it comes into the coast during the spring months.
Lumpfish infected with more than 600 sea lice (Caligus elongatus). Photo: Øivind Øines
Øivind Øines studied sea lice infestations in wild fish for his Ph. D. degree. Using genetic tools, he discovered more information about the pathways of infection and sources of infestation of this important fish parasite. By increasing our understanding of the patterns of infection of sea lice, Øines’ work may prove significant both for the fish farming industry along the coast and for combating the parasite.
The sea louse Caligus elongatus is a parasite that attaches to the skin of fish. It can cause sores on its host, which at worst may prove fatal to the fish. It has been found on more than eighty different fish species in most or the world’s oceans. Sea lice also infect farmed fish and have been reported in large numbers on farmed salmonids at sea, but also on other farmed species such as cod and halibut.
“Since sea lice are found on so many different north-Atlantic fish species, it is highly likely that they can transmit from wild fish to farmed fish. Our genetic studies of the parasite also support this. It is also likely that they can transmit between different farmed species”, says Øivind Øines.
During his doctoral work, Øines developed genetic tools for the identification of these parasites and other related parasitic copepods, which may be nearly identical in appearance during several stages of their life cycles. Øines found two different genetic variants of the sea louse on wild fish, each of which appears to have different patterns of infestation.
Øines shows in his thesis that the sea louse is relatively common among wild fish. Fifteen per cent of wild fish were infected with this parasite outside Arendal during the period 2002 – 2004, which was the area for the field studies. Øines’ studies have revealed in all likelihood how both wild fish and farmed fish become infected, and identified some of the most important probable sources of infection in the ocean.
Dr. Scent. Øivind Øines defended his thesis on December 4, 2007, for the degree of Doctor Scientiarum at the Norwegian School of Veterinary Science with the title: Host selection and infection strategies in Caligus elongatus.
The work was carried out in regii of the Norwegian Veterinary Institute in close collaboration with other researchers at the Institute of Marine Research at Flødevigen, and at the University of Oslo.
Magnhild Jenssen | alfa
When corals eat plastics
24.05.2018 | Justus-Liebig-Universität Gießen
Dispersal of Fish Eggs by Water Birds – Just a Myth?
19.02.2018 | Universität Basel
The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.
Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
25.05.2018 | Event News
02.05.2018 | Event News
13.04.2018 | Event News
25.05.2018 | Event News
25.05.2018 | Machine Engineering
25.05.2018 | Life Sciences