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Energy requirements and feeding behaviour of salmonids in culture

Bailey, Jason (2003). Energy requirements and feeding behaviour of salmonids in culture. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae. Silvestria, 1401-6230 ; 264
ISBN 91-576-6348-3
[Doctoral thesis]

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Abstract

This thesis deals with the feeding management of salmonids, from the calculation of the daily feed requirement to the presentation and delivery of that ration taking into consideration the feeding behaviour. The digestible energy need (DEN) to grow 1 kg of wet body weight was calculated for different farmed fish species. In general, the DEN increased with increasing body weight. Using this information, a feed ration model was created and tested using rainbow trout (Oncorhynchus mykiss). Fish fed using this model showed a high rate of growth and a good feed conversion ratio (FCR). The model accurately predicted growth in trout and can be easily applied as a method of calculating the daily ration. For comparison, 3 groups were fed using self-feeders. These groups showed a pattern of fluctuating trigger-biting activity across days and this type of pattern was further studied using time series analysis for groups of rainbow trout. Peaks in activity occurred in the morning and evening at lights on and lights off. Across days, peaks in activity are significantly higher every second day. This pattern is probably a result of an “hourglass” mechanism such as the time required for gastric evacuation and the return of appetite. Knowing how much feed to give each day, one must then present it in an optimal way. Rainbow trout were fed the daily ration using various portion sizes and at different temperatures. At 5 ºC, growth and FCR were best when small portion sizes were used. At higher temperatures, good growth rates and FCR were observed over a broader range, indicating a high level of plasticity in the trout’s ability to adjust to different portion sizes at higher temperatures. To further evaluate feed presentation, Atlantic salmon (Salmo salar L.) were raised in sea cages, and fed using different combinations of pellet sizes and delivery rates. Treatment groups were compared using growth rate. No significant linear effect on growth due to pellet size or delivery rate could be detected. For pellet size, however, indications point to a non-linear relationship with growth rate. Salmon grew equally well irrespective of treatment further indicating a high level of plasticity in the salmon’s ability to adjust to changes in feed presentation.

Authors/Creators:Bailey, Jason
Title:Energy requirements and feeding behaviour of salmonids in culture
Year of publishing :February 2003
Volume:264
Number of Pages:28
Papers/manuscripts:
NumberReferences
ALLI. Bailey, J. & Alanärä, A. Digestible energy need (DEN) of selected farmed fish species. Manuscript. II. Bailey, J. & Alanärä, A. 2001. A test of a feed budget model in rainbow trout, Oncorhynchus mykiss (Walbaum). Aquaculture Research 32: 465-469. III. Bailey, J. & Alanärä, A. Mapping the demand-feeding pattern of hatchery-reared rainbow trout, Oncorhynchus mykiss (Walbaum). Manuscript. IV. Bailey, J. & Alanärä, A. Effect of feed portion size on growth of rainbow trout, Oncorhynchus mykiss (Walbaum), reared at different temperatures. Submitted. V. Bailey, J., Alanärä, A. & Crampton, V. Does delivery rate and pellet sizes affect growth rate in Atlantic salmon (Salmo salar L.) raised under semi-commercial farming conditions? Aquaculture (In Print).
Place of Publication:Umeå
ISBN for printed version:91-576-6348-3
ISSN:1401-6230
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:M Aquatic sciences and fisheries > M01 Fisheries and aquaculture - General aspects
Subjects:Not in use, please see Agris categories
Agrovoc terms:oncorhynchus mykiss, salmo salar, animal feeding, growth, models, self feeding, feed intake, feeding habits, feeding frequency, energy value, temperature, feeds, pellets
Keywords:feed management, energy requirements, feed budget, self-feeders, feeding behaviour, feeding intensity, portion size, pellet size
URN:NBN:urn:nbn:se:slu:epsilon-13
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-13
ID Code:134
Department:(NL, NJ) > Institutionen för vattenbruk (990101-061231)
Deposited By: Jason Bailey
Deposited On:20 Feb 2003 00:00
Metadata Last Modified:02 Dec 2014 10:01

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