Taurine supplementation in diet for olive flounder at low water temperature

Abstract

The objective of this study was to examine the effect of dietary supplementation of taurine for juvenile olive flounder (Paralichthys olivaceus) at low water temperature (16.4 ± 0.36°C). Fish meal (FM)-based diet was used as the control diet. Four other experimental diets were prepared by adding taurine to FM-based diet at 0.25, 0.50, 1.00, and 1. 50% (T1, T2, T3, and T4, respectively). Each experimental diet was fed to triplicate groups of fish (initial mean body weight, 19.5 g) for 10 weeks. At the end of the feeding trial, growth performance and feed utilization, hematological parameters, non-specific immune responses, whole-body proximate composition, and liver mRNA expression of insulin-like growth factor-1 (IGF-1) were investigated. Feed conversion ratio was significantly reduced while protein efficiency ratio was significantly increased in taurine-supplemented groups. Hematocrit and hemoglobin were also significantly increased while plasma cholesterol levels were decreased in taurine-supplemented groups than those in the control group. Nitroblue-tetrazolium, myeloperoxidase and lysozyme activities, and plasma immunoglobulin level were significantly increased by taurine supplementation. These results suggest that dietary taurine supplementation is effective in improving growth performances, feed utilization, and innate immunity of olive flounder in low water temperature season.

Taurine supplementation enhances the replacement level of fishmeal by soybean concentrate in diets of juvenile Pacific white shrimp ( Litopenaeus vannamei Boone, 1931)

“…Moreover, previous studies showed that plant protein sources' dietary high levels decreased more antioxidant enzyme activities in white shrimp (Wan et al, 2018;Xie et al, 2016). In the previous reports, the higher immune response in terms of SOD, GPx and RB activities was recorded in yellow catfish (Li et al, 2016) and olive flounder (Kim et al, 2017) diets supplemented with taurine.…”

Effects of taurine supplementation in low fish meal diets for red seabream (Pagrus major) in low water temperature season

“…In the previous studies, plasma total protein, total cholesterol, triglyceride levels, and HSI of red seabream were significantly reduced when fish were fed taurine-incorporated LFM diet in which 70% of FM was replaced with SM (Goto et al 2001). Kim et al (2017) observed that hematocrit and hemoglobin level of olive flounder were significantly enhanced by taurine supplementation to their diets. It seems that there is a discrepancy among biochemical and biometric results obtained from different studies on dietary taurine supplementations.…”

“…Taurine exerts ability to enhance immunity of fish and shellfish. For instance, innate immune responses of olive flounder were enhanced in fish by 0.25-1.0% taurine supplementation in a FM diet (Kim et al 2017). Dong et al (2018) found that dietary supplementation of taurine is important to improve the innate immunity of Chinese mitten crab (Eriocheir sinensis).…”

“…In the present study, an improved expression level of IGF-1 mRNA was observed in fish fed taurinesupplemented diets compared to the respective SM diets. In a previous study, we observed that IGF-1 mRNA expression of olive flounder can be enhanced by dietary taurine supplementation (Kim et al 2017). IGF-1, also known as somatomedin C, is an endocrine hormone which is produced in liver to mediate prenatal and postnatal growth of vertebrates (Coleman and Tsongalis 2010).…”

“…Liver samples were taken from three fish per tank and frozen immediately in liquid nitrogen. Total RNA isolation and gene expression determination were conducted according to Kim et al 2017). The 18S rRNA gene was used as the housekeeping gene.…”