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Lipostatic regulation experimental provoked in farmed atlantic salmon (salmo salar L.)

Liu, Liang
Master thesis
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URI
http://hdl.handle.net/11250/186213
Date
2013-08-26
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  • Master's theses (IHA) [317]
Abstract
The present study was conducted to investigate the influence of various salmon fatty

accumulations in the early summer on the growth of Atlantic salmon in the following

autumn and if this may be linked to sexual maturation preparation. The effect of

varying dietary supplementation treatment on the growth of Atlantic salmon was also

studied.

During the build-up phase from 21st May to 8th August, the Atlantic salmon was

distributed into 3 cages with an initial mean body weight of 1085 g ± 2. Three

different pre-diets: T1: 100% original Cod feed, T2: 50% ration of original Cod feed

and T3: 100% original Atlantic salmon feed were used in this period. The build-up

phase was designed to provoke the varied muscle fat content and body weight in the

early summer. Thereafter, in the second experimental period (from 9th August to 6th

December), individually marked (Pit-Tag) fish were randomly selected from each

build-up group and polled in 12 identical net-pens. Three different autumn diets were

supported in randomized block design, which were Control feed T6, Marine feed T4

and Protein feed T5 (Control feed + 2% glutamate/arginine). The influence of

different initial muscle fat content in the early summer on the growth rate (SGR and

TGC), body weight and muscle fat deposition in the following autumn and if this

affects the sexual maturation preparation was determined. We also investigated the

effect of different ingredient supplemental diets on the growth of fish.

At the end of the build-up phase, fish fed T3 Salmon diet was shown to have a high

muscle fat content. During the second experimental period, glutamate/arginine and

rapeseed oil supplemental diets had no significant effect on growth rate and feed

utilization. However, significant differences were observed within pre-dietary groups.

Fish with low initial muscle fat content obtained a significantly higher growth (SGR

and TGC) than their counterparts. Both partial compensation and over-compensation

III

had been achieved in the study. The obtained differences in growth and fat content

accumulation could be considered as results of lipostatic regulation, meanwhile that

also might be closely linked to the sexually mature preparation. We thus presumed

that fish will slow down or even stop their fat accumulation once certain fat and

energy reserves have been achieved according to lipostatic regulation and/or sexual

maturation.
Publisher
Norwegian University of Life Sciences, Ås

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