Yellow- and brown-seeded canola (Brassica napus), camelina (Camelina sativa) and Ethiopian mustard (Brassica carinata) in practical diets for rainbow trout fingerlings

ABSTRACT

Rainbow trout (initial body weight 2.5 ± 0.3 g; 30 fish/tank; 4 tanks/treatment) were offered either the control diet or one of four test diets. The test diets contained brown seed coat canola (BSC; Brassica napus), yellow seed coat canola (YSC; Brassica rapa), Brassica carinata (Ethiopian mustard; EM), or Camelina sativa (CAM), which were added to their respective diets at a 15% dietary inclusion level. Final weight of fish fed the control (101.0 g) was higher than that of fish fed BSC (80.7 g) and CAM (85.3 g) (P < 0.05). Fish fed the control also gained more weight (98.4g) than fish fed BSC (78.2 g) and CAM (83.0 g) (P < 0.05). Fish fed YSC and EM at a 15% dietary inclusion level had a final body weight and gain that was more similar to the control than fish fed BSC and CAM. Considering the fact that there was no significant difference among treatments for SGR and FCR for the entirety of the trial, all four oilseeds have potential for use in rainbow trout feeds.

KEYWORDS:

• Brassica carinata
• Camelina sativa
• Brassica napus
• Ethiopian mustard
• camelina
• yellow-seeded canola
• brown-seeded canola
• rainbow trout

Acknowledgments

The Nova Scotia Crop Development Institute (Truro, NS, Canada) provided cleaned samples of all the oilseed types tested in this experiment. Additional ingredients were donated by NorthEast Nutrition (Truro, NS, Canada). The Dalhousie University, Faculty of Agriculture (Truro, NS, Canada) Fish Nutrition students provided assistance with this research.

Disclosure statement

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the article.