First feeding a plant-based diet to rainbow trout Oncorhynchus mykiss fry

Rainbow trout swim-up fry were first fed a fishmeal-based diet (FMD) or a plant-based (5% fishmeal) diet (LFMD) for 3 weeks and their growth performances and body compositions were compared. Two lines of fry were used: a control group that had not experienced low fishmeal diets in previous generatio...

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Published inAquaculture Science Vol. 68; no. 3; pp. 211 - 220
Main Authors Yamamoto, Takeshi, Matsunari, Hiroyuki, Furuita, Hirofumi, Miura, Masayuki, Ozawa, Ryo, Okazaki, Takumi, Oku, Hiromi, Murashita, Koji, Yoshinaga, Hazuki
Format Journal Article
LanguageEnglish
Published Tsu Japanese Society for Aquaculture Science 01.01.2020
Japan Science and Technology Agency
Subjects
Body composition
Calcium
Carnosine
Diet
Docosahexaenoic acid
Eicosapentaenoic acid
First feeding
Fish
Fish oils
Fishmeal
Freshwater fishes
Fry
Growth
Histidine
Lecithin
Lipids
Low fishmeal diet
Lysine
Methionine
Nutrient deficiency
Nutrients
Oncorhynchus mykiss
Phospholipids
Phosphorus
Salmon
Soybeans
Survival
Taurine
Trout
Zinc
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Summary:Rainbow trout swim-up fry were first fed a fishmeal-based diet (FMD) or a plant-based (5% fishmeal) diet (LFMD) for 3 weeks and their growth performances and body compositions were compared. Two lines of fry were used: a control group that had not experienced low fishmeal diets in previous generations and a group that had been selected for growth with 5% fishmeal diets over 2 generations. Docosahexaenoic acid (DHA, as tuna oil) and phospholipid (soybean lecithin) as well as methionine and lysine were fortified to LFMD. Survival rates were similar between treatments at 99%. Large differences in growth were not observed between the fish lines, however, the growth of fish fed LFMD was consistently inferior to fish fed FMD. Whole body ash, calcium, phosphorus and zinc concentrations, and the proportions of eicosapentaenoic acid (EPA) and DHA in the whole body polar lipid, of fish fed LFMD were lower than those of fish fed FMD. In fish fed LFMD, whole body taurine and free histidine concentrations were also lower while the anserine and carnosine concentrations were higher, compared to fish fed FMD. These results suggest that plant-based diets could be used as starter feeds in rainbow trout with further supplementation of certain nutrients.
ISSN:0371-4217
2185-0194
DOI:10.11233/aquaculturesci.68.211