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Partial Replacement of Fishmeal with Duckweed (Spirodela polyrhiza) in Feed for Two Carnivorous Fish Species, Eurasian Perch (Perca fluviatilis) and Rainbow Trout (Oncorhynchus mykiss)

Stadtlander, Timo; Tschudi, Fridolin; Seitz, Andreas; Sigrist, Mathias; Refardt, Dominik and Leiber, Florian (2023) Partial Replacement of Fishmeal with Duckweed (Spirodela polyrhiza) in Feed for Two Carnivorous Fish Species, Eurasian Perch (Perca fluviatilis) and Rainbow Trout (Oncorhynchus mykiss). Hindawi Aquaculture Research, online, pp. 1-15.

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Document available online at: https://doi.org/10.1155/2023/6680943


Summary

Two four-week feeding trials were conducted with fngerlings of Eurasian perch (Perca -uviatilis, 3.52 ± 0.08 g) and rainbow trout (Oncorhynchus mykiss, 1.49 ± 0.05 g) fed with graded levels of dried (DWD) and fermented (DWF) duckweed meal (Spirodela polyrhiza). *e purpose of these two trials was to evaluate DWD and DWF as replacements for fishmeal. Fishmeal protein was substituted by 12%, 24%, and 35% of duckweed protein and compared to control diets containing 40% (for perch) and 35% (for rainbow trout) fishmeal and no duckweed. The performance of the fish (growth, feed conversion, and protein and lipid utilization) and their whole-body composition were evaluated and compared with the control. While even the lowest inclusion level, regardless of its form (dried or fermented), resulted in significantly reduced performance in Eurasian perch, rainbow trout were able to utilize feed containing duckweed meal considerably well. Compared to the control, at a 12% inclusion level, rainbow trout showed an equal or comparable percent weight gain (PWG; DWD: 377%, DWF: 373%), specific growth rate (SGR; DWD: 4.37%/day, DWF: 4.33%/day), feed conversion ratio (FCR; DWD: 1.11, DWF: 1.12), and protein productive value (PPV; DWD: 21.5%, DWF: 21.2%). Increasing the inclusion levels above 12% of both DWD and DWF resulted in reduced performance in rainbow trout, with the most pronounced eBects observed in the DWD35 group. All experimental diets, including control, aBected the whole body composition of perch, most notably reducing the lipid content compared to initial fish. Compared to initial, control and DWD rainbow trout increased whole-body protein, lipid, and ash contents. In conclusion, for rainbow trout, fermented and dried S. polyrhiza duckweed meal appears to be a promising feed ingredient when used at a maximum inclusion level of 12%, while for Eurasian perch, it should not be considered as a feed ingredient.


EPrint Type:Journal paper
Keywords:fishmeal, duckweed, carnivorous animals, aquaculture, Abacus, FiBL50094, Klima, Tierernährung, Wasserlinsen
Agrovoc keywords:
Language
Value
URI
English
fish meal -> fishmeal
http://aims.fao.org/aos/agrovoc/c_2925
English
Duckweed -> Lemna
http://aims.fao.org/aos/agrovoc/c_12131
English
carnivorous animals
http://aims.fao.org/aos/agrovoc/c_9630
English
aquaculture
http://aims.fao.org/aos/agrovoc/c_550
Subjects: Animal husbandry > Feeding and growth
Environmental aspects > Biodiversity and ecosystem services
Animal husbandry > Production systems > Aquaculture
Research affiliation: Switzerland > ZHAW
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Animal > Animal nutrition
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Animal > Aquaculture
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Sustainability > Climate
DOI:10.1155/2023/6680943
Deposited By: Forschungsinstitut für biologischen Landbau, FiBL
ID Code:45846
Deposited On:24 Mar 2023 08:01
Last Modified:16 Jan 2024 10:00
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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