Taurine and/or inorganic potassium as dietary osmolyte counter the stress and enhance the growth of GIFT reared in ion imbalanced low saline water

•Potassium deficient inland saline water leads to osmotic stress and limits growth in GIF tilapia.•0.6 % potassium in diet mitigates stress and improves growth in GIFT.•Dietary taurine and K+ act synergistically to relieve stress and ensure higher growth than freshwater rearing.•Dietary K+ and tauri...

Full description

Saved in:
Bibliographic Details
Published in:Food chemistry. Molecular sciences 2022-07, Vol.4, p.100058, Article 100058
Main Authors: Velselvi, Rajendran, Dasgupta, Subrata, Varghese, Tincy, Sahu, Narottam Prasad, Tripathi, Gayatri, Panmei, Hougaina, Singha, Krishna Pada, Krishna, Gopal
Format: Article
Language:English
Subjects:
Aquaporin
Chloride channel2
GIFT
Sodium potassium ATPase
Stress enzymes
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Potassium deficient inland saline water leads to osmotic stress and limits growth in GIF tilapia.•0.6 % potassium in diet mitigates stress and improves growth in GIFT.•Dietary taurine and K+ act synergistically to relieve stress and ensure higher growth than freshwater rearing.•Dietary K+ and taurine regulatesNKAa1, AQP1 and ClC2mRNA expressionfor retrieving ionic and energy homeostasis. The effects of dietary osmolytes for alleviating osmotic stress and enhancing growth are not well elucidated in fish reared in inland saline water. The present study evaluated the effects of dietary taurine or potassium (K+) individually or in combination on growth, ionic homeostasis, and stress response of GIFT tilapia reared in potassium deficient low saline water (PDLSW, 10 ppt salinity) mimicking inland saline water. Isonitrogenous and isoenergetic diets supplemented with five potassium concentrations (0, 0.3, 0.45, 0.6 and 0.75 %), two taurine (T) concentrations (0.5 and 1.0 %) and two combinations of both (K+ 0.1 % + T 0.5 % and K+ 0.2 % + T 0.5 %) were fed to GIFT juveniles (4.4 ± 0.02 g body weight) and reared in PDLSW for 45 days. The fish fed on the diet fortifying with K+ 0.2 % + T 0.5 % showed the highest growth performance among the controls and other treatment groups. Dietary supplementation had no effects on PDLSW induced increase in osmoregulatory endpoints. The optimum dietary potassium requirement of GIFT reared in PDLSW was 0.57 and 0.599 g/100 g diet. Dietary K+ down-regulated the PDLSW induced expression of NKAa1, AQP1, and ClC2, whereas inhibitedtaurine-induced up-regulation of AQP1 and CLC2,which is the first report in tilapia. In addition, dietary K+ and taurine modulated antioxidant and metabolic enzyme activities for easing stress and balancing energy requirements. Thus, blending of potassium (0.2 %) and taurine (0.5 %) in the diet appears best to mitigate stress and enhance GIFT growth reared in inland saline water.
ISSN:2666-5662
2666-5662
DOI:10.1016/j.fochms.2021.100058