Nutraceutical potential of nejayote as a supplement to the conventional diet for feeding Pacific white shrimp (Penaeus vannamei) infected with Vibrio parahaemolyticus (e-Latin Food 2020)
Immunostimulants have been used to prevent Penaeus vannamei culture diseases. Nejayote is a residue from the nixtamalization of corn, whose phytochemical profile provides bioactive properties. This study evaluated the effect of adding nejayote (2%, 4%, 8%, 16% w/w) to conventional shrimp feed (AC) on the nutraceutical and nutritional properties. The physiological response of shrimp infected with Vibrio parahaemolyticus and fed with the best formulation (ACN) was evaluated. Shrimp feed was characterized by physicochemical, proximal, phenolic and antioxidant activity (AOX). Two bioassays were performed to determine the feed conversion radio (FCR) and the cellular response (CR) of the shrimp fed with ACN and AC. For FCR, the weight of the shrimps was recorded during 14 days of feeding. For CR, the group fed with ACN was infected with V. parahaemolyticus and the hemocyte content was recorded for 6 h. The quality of the water (physicochemical and microbiological) was monitored to determine its influence. The content of total phenols and AOX increased according to the addition of nejayote in AC (p≤0.05). The AC-4% formulation has the best nutritional profile with bioactive potential (p≤0.05). The organisms fed with AC-4% expressed a better FCR (p≤0.05), which promotes the cellular response in shrimp populations. The relationship of the water quality with the physiological response of the groups was discarded (p≤0.05). Nejayote is a by-product with high potential use in the health of shrimp farming.
Key Words: Penaeus vannamei, Nejayote, Nutraceutical feed, Vibrio parahaemolyticus.