Narjes Sanchooli*; Hashem Khandan Barani; Abdolali Rahdari
Volume 5, Issue 3 , March 2017, , Pages 107-116
Abstract
This study aimed to investigate the effects of different levels of the amino acid lysine on growth performance, feed efficiency and body composition of juvenile snow trout (Schizothorax zarudnyi). For this purpose, 150 fish with average weight 22.51±0.28 g fed with five levels of dietary amino ...
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This study aimed to investigate the effects of different levels of the amino acid lysine on growth performance, feed efficiency and body composition of juvenile snow trout (Schizothorax zarudnyi). For this purpose, 150 fish with average weight 22.51±0.28 g fed with five levels of dietary amino acid lysine including 0 (control), 7, 12, 17 and 22 g/kg diet, for 8 weeks. Fish fed two times daily at 3% body weight rate. At the end of feeding trial, growth performance, feed efficiency and body composition were recorded. Maximum final weight and body weight, best average daily gain, best specific growth rate and increase the relative weight were evident for 17 g/kg diet treatment. Maximum body protein content was obtained for 17 g/kg diet treatment. Body moisture, fat and ash content remained unchanged. Based on the above results, it may be concluded 17 g lysine per kg diet is optimal for the growth, feed efficiency and body composition of juvenile S. zarudnyi.
H Khandan Barani; M Miri; H. A. Dahmardeh
Volume 4, Issue 3 , January 2016, , Pages 1-11
Abstract
Abstract Pollution is a world problem with serious consequences. Heavy metals are an important group of these contaminants and enter aquatic ecosystems from anthropogenic and natural sources and animal health and systems are affected. In this study, the effect of lead exposure (3 mg/l concentration, ...
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Abstract Pollution is a world problem with serious consequences. Heavy metals are an important group of these contaminants and enter aquatic ecosystems from anthropogenic and natural sources and animal health and systems are affected. In this study, the effect of lead exposure (3 mg/l concentration, 30 days) on activity of tissue enzymes, including acetyl cholinesterase, alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP) and lactate dehydrogenase (LDH) In liver, gills, brain and muscle were studied in Snow trout (Schizothorax zarudnyi). The results showed that lead caused a significant inhibition of acetyl cholinesterase in the gills and brain as compared to control group (p˂0/05). The activity of ALT was increased significantly in the liver and brain homogenates following lead acetate exposure (p˂0/05). A significant increase in AST activity was observed in the liver and brain (p˂0/05). Moreover, LDH and ALP activity were increased significantly following lead acetate exposure only in the liver (p˂0/05). According to this, lead exposure in Snow trout leads to interactions between these metal and biological systems, which could affect metabolic enzyme activities in some tissues.The enzyme activity by lead did not follow the same pattern of increase or decrease and different results were based on enzymes and tissue. Therefore, monitoring of enzymatic profiles in tissues of Snow trout could be useful for identification of overall fish health and organ dysfunction following lead exposure.
