Abstract
The utilization of feed resources in Norwegian salmon farming in 2010 and 2012 has been reported previously. The present study is an update for 2016, along with data on whole body composition of slaughter sized salmon. In 2016, in total 1,252,573 tonnes of salmon were produced. Fillet production was estimated to 814,172 tonnes. Given ‘as is’, 1,627,478 tonnes of feed ingredients were used (1,520,358 tonnes on dry matter basis). Marine ingredients constituted 405,921 tonnes (25%), 1,156,135 tonnes (71%) were of plant origin and 65,422 tonnes (4%) were other ingredients. The estimated retention of energy, protein, lipid, DHA + EPA and phosphorus was 41.3%, 36.6%, 49.4%, 37.3% and 18.5%, respectively, in whole salmon. In fillet, the corresponding retention values were 23.0%, 26.1%, 24.6%, 21.8% and 9.5%, respectively. Whole body of slaughter sized salmon (mean body weight 5276 g) contained 12.71 MJ/kg energy, 16.9% crude protein, 21.5% total lipids (0.44% EPA, 0.72% DHA) and 1.8% ash (0.31% phosphorus). The salmon production and use of feed ingredients in 2016 were of similar volumes as in 2012, but the use of marine protein sources was further reduced and replaced by plant ingredients.
Highlights
The utilization of feed resources in Norwegian salmon farming during one production year (2010 and 2012) has been described by Ytrestøyl et al (2015)
This study describes utilization of feed resources in salmon production in a whole country during a whole year and includes all losses of feed ingredients and fish
Methods such as life cycle analysis (LCA) needs to be further developed to cover detailed information on all inputs and outputs in the production, which differs in different parts of the world
Summary
The utilization of feed resources in Norwegian salmon farming during one production year (2010 and 2012) has been described by Ytrestøyl et al (2015). Feed composition has changed considerably over the last decades from mainly marine ingredients to an increasing inclusion of plant ingredients. Technical equipment and size of farming units have developed over time (Nilsen, 2010; Gjedrem et al, 2012). Such changes may affect the growth and feed utilization in the salmon. The genetic gain per generation in terms of growth is estimated to 10–14% (Gjedrem, 2010; Gjedrem et al, 2012) Whether this growth potential is fully realized in practical farming conditions is dependent on rearing conditions, diet composition, disease outbreaks and parasites. Indices for feed utilization and production efficiency change over time and need to be assessed regularly in order to follow long-term trends in production efficiency
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
