Practical low-fishmeal diets for rainbow trout (Oncorhynchus mykiss) reared in RAS: Effects of protein meals on fish growth, nutrient digestibility, feed physical quality, and faecal particle size

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12520%2F23%3A43906211" target="_blank" >RIV/60076658:12520/23:43906211 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.aqrep.2022.101435" target="_blank" >https://doi.org/10.1016/j.aqrep.2022.101435</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.aqrep.2022.101435" target="_blank" >10.1016/j.aqrep.2022.101435</a>

Result language

angličtina

Original language name

Practical low-fishmeal diets for rainbow trout (Oncorhynchus mykiss) reared in RAS: Effects of protein meals on fish growth, nutrient digestibility, feed physical quality, and faecal particle size

Original language description

To evaluate strategies for optimizing waste in recirculating aquaculture systems, 1020 rainbow trout (initial live weight 17.2 +/- 7.50 g/fish) were distributed into 12 tanks after 21 d of acclimation and fed during 84 days with four practical diets (crude protein: 49% DM; crude fat 26% DM; gross energy: 23 MJ kg-1) containing different rates of fishmeal and alternative protein meals, i.e. Diet FM (307 g kg-1 fishmeal, 61.2 g kg-1 poultry by-product meal); diet PBM (183 g kg-1 fishmeal, 168 g kg-1 poultry by-product meal); diet FeM (198 g kg-1 fishmeal, 61.2 g kg-1 poultry by-product meal, 76.5 g kg-1 hydrolysed feather meal); diet FeM+RM (171 g kg-1 fishmeal, 61.2 g kg -1 poultry by-product meal, 76.5 g kg-1 hydrolysed feather meal, 60.4 g kg-1 rapeseed meal). High structural integrity of extruded pellets and low oil leakage were measured in all diets, while the lowest water turbidity at 15 min after feed administration was recorded for FeM diet (2.7 vs. 12.7 mg L-1; p &lt; 0.05). Diets did not affect fish specific growth rate (2.16% d-1). The lowest apparent digestibility of protein was measured with diet FeM (79.6%) and the highest with diet PBM (86.0%) (p &lt; 0.001); apparent digestibility of lipids was higher in fish fed diets FM and PBM than the other diets (84.4% and 85.5% vs. 66.4% vs. 71.1%; p &lt; 0.001). Fish fed diet PBM showed a higher percentage of retained faeces at mesh sizes 0.5-0.8 mm (33% vs. 30%; p &lt; 0.005) and 0.3-0.5 mm (64% vs. 59%; p &lt; 0.001) compared with the other diets. The replacement of fishmeal with poultry by- product-meal had positive effects on nutrient digestibility and faecal particle size. The replacement with hydrolysed feathers and rapeseed meals impaired nutrient digestibility but had positive implications for water turbidity.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

40103 - Fishery

Project

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Continuities

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Aquaculture Reports

ISSN

2352-5134

e-ISSN

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Volume of the periodical

28

Issue of the periodical within the volume

neuvedeno

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

9

Pages from-to

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UT code for WoS article

000911307400008

EID of the result in the Scopus database

2-s2.0-85144093071