Roe report and digital pathology in SalmoBreed workshop
- The good dialogue with the audience indicates we were successful with the theme, says a satisfied workshop director Thoralf Solberg.
After an introduction to what SalmoBreed and Benchmark can offer to Norwegian breeders, the Genetics Director Borghild Hillestad gave a lecture on SalmoBreed’s breeding activity. She highlighted in particular how SalmoBreed organizes its family production with new families each year.
-We can choose to our customers the line of fish that delivers roe very close to our breeding core, says Borghild. Thus, we can deliver roe selected with properties in parallel with the production of brood stock, and we don’t need to wait for a whole generation during three-four years before we can offer new products.
SalmoBreed controls its breeding program according to the challenges that customers have. Growth has been a high-priority property in the work from first generation. Together with slaughter quality and slaughter yield these are important and basic properties. In addition to that, fish is strongly selected for resistance against various diseases and parasites. Genomics, which appears both through genomic selection and QTL, has become a very important tool in recent years. Such methods increase the precision of breeding work, and allows for greater progress from generation to generation.
Genomic selection has been a major focus area in the last few years, and Borghild showed our own film called “What is genomic selection”. There is a lot of effort to provide a clear and easily understandable explanation of how SalmoBreed works to produce fishes that are naturally strong against lice through genomic selection. The film can be seen here. LINK
Silje Sveen, responsible for documentation in SalmoBreed presented the Roe report for 2014/15. Here it is summed up all the incoming results from customers to the Roe survey and Silje presented a comprehensive overview of the production conditions, equipment and procedures.
The Roe report analyses the period starting from roe is placed via hatching to four weeks after the feeding starts.
-Our customers are very skilled! The vast majority produces exactly according to our general recommendations for incubation, hatching and feeding start, says Silje. This was also reflected in the report. We consider as very good results a 94.5% yield on average 4 weeks after starting the feeding.
Silje emphasized in particular the increasing focus on measuring the total gas in the production tanks. Each year more and more producers make routine measurements of the gas ratio through the production. Silje also presented the Roe report in print. It is now being sent out to all customers who have participated in the survey.
FishVetGroup - the world leader in diagnostics
Jan Petter Berg, Sales Manager in FishVetGroup, gave an introduction to the services FishVetGroup offers in Norway. As a total supplier of diagnostics, the breeder can submit samples and get analysis both in terms of PCR, histology and bacteriology. Jan Petter says that his customers take advantage of the opportunities FishVetGroup offers as “one stop shop”:
Some choose to send the full sample pack, but initially request analysis only by PCR. Then we can look for specific disease organisms. From the findings, or how the fish further develops, we can follow up with the histology to get a more comprehensive picture of the health status.
The veterinarian Hege Hellberg is one of the three pathologists in FishVetGroup Norway. Histology is her main area of work, and she sees great opportunities with today’s working methods.
-Previously I used the microscope, and reported the findings in written reports. Today I work with digital images of histological sections on the PC screen. I can highlight the findings, and post photos in my reports. It also makes it much easier to cooperate with my colleagues who have office in Oslo and Sandnes and globally when we need to use FGV’s global technical competence. We can see each other’s display, discuss and share experiences. If necessary we can also consult pathologists in Inverness or any of the other offices of FishVetGroup. The whole process is very efficient, and the average response time for an analysis sent to us today is 4.6 days. We also have solutions where we respond within 24 hours.
Gills are the most important organ of a fish
Hege’s main theme in the seminar was gill health, and she stressed the importance of good gill status for fishes. The way fishes absorb oxygen is essential for functioning and well-being.
-Knowing the gill status is crucial to make the right decisions on how fish will endure and react to treatments and other stressful situations.
In the juvenile phase, good water quality is a key to good production results. The total stress gills are exposed is vital for their condition. She cites the combination of infectious organisms and water quality in term of particles, gas and minerals. In the sea, jellyfish and algae have an additional influence on the gills.
AGD and losses during delousing
In recent years, AGD, amoeba in gills created problems in many production installations. Amoebas cause damage to gill epithelium, the outer layer of cells, creates inflammation that imperforate gills. It reduces the surface of the gills and thus oxygen uptake is greatly reduced.
When asked if fish with gill inflammation is more susceptible to other infectious Hege answers that it is very probable.
Robert Sanslett says that in K. Strømmen Fish Farm they follow with close attention the gills status.
-We score gills by lice count and take note if we find something abnormal. In relation to the high dose of hydrogen peroxide, the transition to other delousing methods will reduce gill problems specifically related to hydrogen peroxide injury.
AGD is also under research at SalmoBreed. Borghild tells that there are researches towards the development of good phenotypes for the disease, in order to produce brood with increased resistance.