PhD trial lecture and public defence: Yangyang Gong (FBA)


Ph.d.-candidate Yangyang Gong will hold a trial lecture and defend his thesis for the degree Philosophiae Doctor (PhD), at the Faculty of Biosciences and Aquaculture, Nord University.

Start date:

07 December 2018 10:15

End date:

07 December 2018 15:30

Location:

Auditorium Petter Thomassen (A5)

Phd-kandidat Yangyang Gong
Ph.d.-candidate Yangyang Gong

Title of thesis:
Microalgae as feed ingredients for Atlantic salmon

Title of trial lecture:
The potential of micro-algae in feeds for immunomodulation, gut functioning and enhancement of gut health in farmed fish

Evaluation committee:
Associate Professor Johan Schrama, Wageningen University and Research Center
Senior Scientist Katerina Kousoulaki, Nofima
Associate Professor Ørjan Hagen, FBA, Nord University (leader of committee)

Supervisors:
Professor Mette Sørensen, FBA, Nord University
Professor Kiron Viswanath, FBA, Nord University

About the thesis:
The need for high quality ingredients is expected to increase with the growth of the salmon aquaculture industry. Microalgae are of great interest because they are primary producers of poly-unsaturated fatty acids in the marine environment, and some species can be good sources of protein, lipid and bioactive components for fish feed. 

This PhD thesis examined the potential of microalgae Desmodesmus, Nannochloropsis and Scenedesmus in diets for Atlantic salmon. Apparent digestibility coefficients were determined for Desmodesmus and Nannochloropsis, and effects of different inclusion levels were evaluated in terms of digestibility of main nutrients and energy as well as their effects on growth, feed utilization, whole body chemical composition and intestinal health of the fish. Thermal-mechanical treatment (extrusion) or feed additives were also studied to examine their ability to improve nutrient utilization. 

The overall conclusion from the thesis was that palatability of tested microalgae fed to salmon was good and they can be incorporated up to 10% in both fish meal-based and plant-protein-based salmon feeds. Extrusion can be used as a cost-effective method to improve digestibility of nutrients from microalgae. Additional evidences of improvement of nutrient utilization from microalgae would help to fully understand the potential of different types of microalgae as ingredients for Atlantic salmon feeds. 

The PhD trial lecture and defence are open to the public. The thesis is available on request. Please contact Kristine Vevik, email: kristine.vevik@nord.no

Link for live streaming: 
https://mediasite.nord.no/Mediasite/Catalog/Full/848e185788644366b4ac818a7f0159ad21


Start date:

07 December 2018 10:15

End date:

07 December 2018 15:30

Location:

Auditorium Petter Thomassen (A5)