Intestinal impairment of the California yellowtail, Seriola dorsalis, using soybean meal in the diet

• Published in: Aquaculture Vol. 513; p. 734443
• Main Authors: Viana, María Teresa, Rombenso, Artur N., Del Rio-Zaragoza, Oscar B., Nomura, Mario, Díaz-Argüello, Rodolfo, Mata-Sotres, José A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.11.2019
• Subjects: Blood parameters; Gene expression; Histology; Intestinal health; Seriola dorsalis; Soybean meal; Blood parameters; Histology; Seriola dorsalis; Gene expression; Intestinal health; Soybean meal
• ISSN: 0044-8486; 1873-5622
• DOI: 10.1016/j.aquaculture.2019.734443

The soybean meal as a possible anti-nutritional factor to result in intestinal damage in the California yellowtail, Seriola dorsalis, was study. Four diets were formulated to contain increasing amounts of soybean meal (SBM; 0, 10, 15, and 20%) at the expense of fishmeal. The diets contained similar protein and lipid levels (54 and 15%). After a 30-day feeding trial, coexistent damage in the intestinal epithelium was revealed. While the overall performance showed no significant differences among treatments; blood parameters, histology and molecular expression of functional, immunological and antioxidant enzymes, of the distal intestine (DI) displayed significant differences. The histology snits exhibited a reduction in the DI mucosal folds number, and height. The expression patterns of il1b, hsp70, hsp90, and bcl-2 genes revealed an impaired immunological response at higher levels of SBM (15% and 20%). The digestive functions estimated by the expression patterns of mga, apn, and ATPase also showed significant differences among treatments. The expression of antioxidant enzymes (sod and gpx1) as an indicator of oxidative stress was drastically modified following the increasing levels of dietary SBM. In conclusion, the results indicate a detrimental status of the intestinal physiology of S. dorsalis fed SBM-based diets at inclusion levels above 10%, suggesting that SBM should be used with caution. •Soybean meal may affect the intestinal structure and immune function of Seriola dorsalis.•Soybean meal content above 10% in Seriola dorsalis aquafeeds may result in an intestinal impairment.•Increasing levels of soybean meal in the diets of Seriola dorsalis induces the gene expression of antioxidant enzymes.