PhD defence and trial lecture: Florence Chandima Perera Willora Arachchilage (FBA)

PhD candidate Florence Chandima Perera Willora Arachchilage will hold a trial lecture and defend her thesis for the degree Philosophiae Doctor (PhD) at the Faculty of Biosciences and Aquaculture (Bodø), Nord University.

Start date:

02 December 2020 10:15

End date:

02 December 2020 15:00

Location:

A5 Petter Thomassen and Teams
​​​​​Follow the defence on Teams here

Photo Florence.jpg​Doctoral candidate: Florence Chandima Perera Willora Arachchilage​

Trial lecture topic
Alternative protein and lipid sources for fish aquafeeds​

Thesis title
The potential of plant ingredients in diets of juvenile lumpfish (Cyclopterus lumpus)​

Evaluation Committee
- Lecturer Dr. Monica Betancor, University of Stirling
- Professor Albert K. Imsland, UiB, Bergen / Akvaplan-niva
- Associate Professor Chris Andre Johnsen, FBA, Nord University

Supervisory Committee
- Associate Professor Ørjan Hagen, FBA, Nord University
- Professor Mette Sørensen, FBA, Nord University

About the thesis
Lumpfish (Cyclopterus lumpus) is currently used  as a biological control against the sea-lice in farming of Atlantic salmon. In Norway, the use of farmed lumpfish has increased 40 folds during last seven years. However, there are substantial knowledge gaps about nutrient requirements and how well this species utilize commercially available plant feed ingredients. 

The aim of this PhD thesis was therefore to investigate the potential of lumpfish to utilize plant protein concentrates and rapeseed oil as replacement for fishmeal and marine oil. Protein ingredients evaluated were mixtures of soy and pea protein concentrates replacing fishmeal in a dose response design.  Replacement of marine oil in the diet with rapeseed oil was also designed as a dose response replacing up to 100% of the marine oil. Changes in fish growth, muscle cellularity, chemical and fatty acid compositions, digestive enzymes and gut histology were studied. 

Replacing up to 50% of fishmeal and/or marine oil did not compromise the growth, while a reduction in growth was observed at high inclusion levels of plant ingredients i.e. 75% of plant protein concentrates and 100% rapeseed oi.  Overall, the results of present thesis suggests that plant protein concentrates and rapeseed oil are successful replacers for marine-based diets of juvenile lumpfish at modest incorporation levels.

Trial lecture: 10:15 - 11:20
Thesis defence: 12:15 - 15:00

All participants engaging remotely via Teams are advised to​ turn off their cameras and microphones for the duration of the trial lecture and thesis defence. ​

Start date:

02 December 2020 10:15

End date:

02 December 2020 15:00

Location:

A5 Petter Thomassen and Teams
The PhD trial lecture and defence are open to the public. The thesis is available upon request. Please contact Jeanett Stegen.