Doctoral Dissertation

(14.12.2018) Can We Serve “Vegan Menu” to Carnivorous Fish? (Siqin)


14.12.2018 12:00 — 16:00

Location: Seminaarinmaki , Vanha juhlasali S212
Partial replacement of fishmeal and imported protein sources is possible. The complete plant-based diet decreases the growth of the rainbow trout significantly, but the vegan diet did not affect their oxygen consumption and swimming ability.

MSc Gerile Siqin from University of Jyväskylä found in his Aquatic Sciences dissertation that the growth of rainbow trout decreased with the level of dietary plant protein, but not the performance.

- The main objective of this research was to investigate the replacement of fishmeal and imported protein sources with the local plant proteins in rainbow trout feed, using naturally occurring stable isotopes and swimming respirometry, explains Siqin.

Nutritional quality of different proteins was studied using stable isotope analysis and effects of protein quality on fish performance in a swim-tunnel respirometer.

The main principle of stable isotope technique is that “you are almost what you eat”. Stable isotope technique revealed that isotope ratio of the fish tissues and faeces becomes closer to their diet over time, and the better the diet, the closer they become. The used stable isotope analysis is very new in fish nutrition research. 

MSc Gerile Siqin defends his doctoral dissertation on "Complementary Approaches for Assessing Protein Sources in Fish Feed" on Friday 14.12.2018 at 12:00 o'clock at lecture hall Seminarium, S212. The Opponent is Professor Anders Kiessling (Swedish University of Agricultural Sciences, Sweden) and custos is Professor Juha Karjalainen (University of Jyväskylä). The doctoral dissertation is held in English.

Gerile Siqin has done his BSc in Animal Science at Inner Mongolia Agricultural University in China 2008, and MSc in Science for Bioresources at Okayama University in Japan 2012. After that, he enrolled on the MSc programme in Feed Manufacturing Technology at Norwegian University of Life Sciences in Norway 2014–2015 and started his doctoral studies at the Department of Biological and Environmental Science at University of Jyväskylä in 2015.

More information:

The dissertation is published ISSN: 2489-9003, ISBN: 978-951-39-7625-5 (PDF). Link to thesis: http://urn.fi/URN:ISBN:978-951-39-7625-5.