Publication Date:
2021-05-19
Description:
The main goal of the current study was to investigate the effects of low protein diets along
with fishmeal replacement by plant protein in rainbow trout diet. In the current study, three
protein levels (32, 36 and 40%) and three fishmeal levels (20, 40 and 60%) were tested in
rainbow trout. Amino acid content of the diets were balanced by addition of essential amino
acids. This led to nine experimental diets and three replicates for each treatment. The results
showed that growth parameters were influenced by protein level (p〈0.05). However, fishmeal
replacement only changed final weight and specific growth weight (p〈0.05). The result also
revealed that the interaction effect between protein level and fishmeal replacement was
significant only for specific growth rate (p〈0.05) and there were no interaction effect for other
growth parameters (p〉0.05). Maximum growth was observed in fish fed diet containing 36%
protein and 40% fishmeal. Both protein level and fishmeal replacement affected TAN
excretion in rainbow trout (p〈0.05) and minimum ammonia nitrogen was observed in
treatments 36p20f and 32p40f (p〈0.05). In conclusion, the current result suggested that
lowering dietary protein by 36% and also fishmeal replacement by plant protein up to 60%
did not have a negative impact on growth parameters in rainbow trout when dietary essential
amino acids were balanced. This condition also can lead to a lower ammonia release to water.
Description:
Published
Keywords:
Oncorhynchus mykiss
;
Fishmeal
;
Protein Level
;
Feed Conversion
;
Growth
;
Amino Acids
;
Nitrogen excretion
Repository Name:
AquaDocs
Type:
Journal Contribution
,
Refereed
Format:
pp.137-148
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