Effect of duration of feeding plant-based diet to rainbow trout Oncorhynchus mykiss fry on subsequent utilization of plant-based diet in juveniles

Effect of the duration of plant-based starter diet (PD1) feeding in rainbow trout Oncorhynchus mykiss fry on the growth and biochemical parameters of juveniles fed again a plant-based grower diet (PD2) was examined. Three groups of swim-up fry were fed (1) a fishmeal-based starter diet (FD1) for 4 w...

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Published inAquaculture Science Vol. 70; no. 2; pp. 157 - 167
Main Authors Yamamoto, Takeshi, Murashita, Koji, Matsunari, Hiroyuki, Miura, Masayuki, Oku, Hiromi, Furuita, Hirofumi, Yoshinaga, Hazuki
Format Journal Article
LanguageEnglish
Japanese
Published Tsu Japanese Society for Aquaculture Science 01.01.2022
Japan Science and Technology Agency
Subjects
Bile
Diet
Digestibility
Duration
Feed conversion
Feed conversion efficiency
Feed efficiency
Feeding
First feeding
Fish
Fishmeal
Freshwater fishes
Fry
Growth
Haematology
Juveniles
Minors
Nutrient status
Oncorhynchus mykiss
PD-1 protein
Plant-based diet
Plants
Proximate composition
Salmon
Trout
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Summary:Effect of the duration of plant-based starter diet (PD1) feeding in rainbow trout Oncorhynchus mykiss fry on the growth and biochemical parameters of juveniles fed again a plant-based grower diet (PD2) was examined. Three groups of swim-up fry were fed (1) a fishmeal-based starter diet (FD1) for 4 weeks, (2) PD1 for 2 weeks and then FD1 for 2 weeks, and (3) PD1 for 4 weeks, respectively. Thereafter, all the fish were fed a commercial fishmeal-based diet until 8 g BW, and then fed PD2 for 9 weeks in duplicate. Irrespective of the duration of feeding PD1 to the fry, juveniles having experienced PD1 exhibited advanced growth and feed efficiency ratio (P < 0.05) relative to juveniles without experience of PD1. Feed intake (% BW/day) of juveniles with experience of PD1 for 4 weeks was significantly higher (P < 0.05) than juveniles without PD1 feeding, and juveniles having experienced PD1 for 2 weeks showed an intermediate value. No marked effects of the first feeding diets were observed on the whole body proximate composition, blood chemistry, bile status, and nutrient digestibility in the juveniles. These results suggest that at least 2 weeks of first feeding of a plant-based diet to rainbow trout fry is necessary to improve the utilization of a plant-based diet in juveniles.
ISSN:0371-4217
2185-0194
DOI:10.11233/aquaculturesci.70.157