Effects of different levels of vitamin B 6 in tank water on the Nile tilapia ( Oreochromis niloticus ): growth performan
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Effects of different levels of vitamin B6 in tank water on the Nile tilapia (Oreochromis niloticus): growth performance, blood biochemical parameters, intestine and liver histology, and intestinal enzyme activity Sina Javanmardi & Kamran Rezaei Tavabe & Kurt A. Rosentrater & Masoomeh Solgi & Rana Bahadori Received: 25 February 2020 / Accepted: 16 June 2020 # Springer Nature B.V. 2020
Abstract According to the importance of vitamin B6 (pyridoxine) as a water-soluble vitamin on the physiological conditions of aquatic animals, the present study aimed to investigate effects of different concentrations of this vitamin in recycle system culture water on the Nile tilapia (Oreochromis niloticus). Treatments including 0 (control), 10, 20, 30, and 40 mg L−1 vitamin B6 were adjusted in triplicate recirculating systems. Each of the experimental tanks (100 L) was stocked 15 fingerling Nile tilapia during 60-day experimental period. According to the findings, weight gain in treatments of 30 and 40 mg L−1 pyridoxine was significantly higher than the other treatments while blood cortisol hormone in the treatment of 40 mg L−1 was significantly highest among the treatments. In addition, mid-intestine trypsin S. Javanmardi : K. Rezaei Tavabe (*) : M. Solgi : R. Bahadori Fisheries Department, Natural Resources Faculty, University of Tehran, Karaj, Iran e-mail: [email protected]
S. Javanmardi e-mail: [email protected] M. Solgi e-mail: [email protected] R. Bahadori e-mail: [email protected] K. A. Rosentrater Department of Agricultural and Biosystems Engineering, Iowa State University, 3327 Elings Hall, Ames, IA 50011-3270, USA e-mail: [email protected]
activity in the treatment of 40 mg L−1 was significantly higher than the other treatments. The histological analysis of the intestine showed that the number of mucussecreting cells significantly decreased in treatments of 30 and 40 mg L−1. Our findings here suggest that pyridoxine can possibly be absorbed by the Nile tilapia’s body through culture water and it seems 20– 30 mg L−1 pyridoxine in the culture water is the optimal concentration for the Nile tilapia juveniles in recycle system culture. Keywords Digestive enzyme . Liver histological changes . Nile tilapia . Water recirculating system . Vitamin B6 requirement
Introduction Nowadays, demand for food and protein has been increased due to the massive increase in the global population, and in this regard, production of Nile tilapia is considered a promising way to overcome this growing need (Godfray et al. 2010). Nile tilapia (Oreochromis niloticus) is one of the most important aquaculture species in tropical and subtropical regions of the world. Due to its popularity and great aquaculture potential, it has been transplanted throughout many other similar regions, globally, and by 2016, its worldwide production had risen to 4.2 million tons (FAO 2018). Due to water restrictions in most areas, aquaculture production by modern methods to achieve intensive and super-intensive production is essential. Fourth rank of
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