Dietary vitamin E requirement for maximizing the growth, conversion efficiency, biochemical composition and haematological status of fingerling Channa punctatus

Abstract

The e¡ect of feeding graded levels of vitamin E (E 0 , E 20 , E 40 , E 60 , E 100 , E 140 , E 180 , E 220 , E 260 ) in nine case-in^gelatin-based isonitrogenous (450 g kg À 1 crude protein) and isoenergetic (17.97 kJ g À 1 gross energy) experimental diets was evaluated in ¢ngerling Channa punctatus for 12 weeks. Growth, nutritional and haematological parameters were studied. Hepatic lipid peroxidation as thiobarbituric acid-reactive substances (TBARS) was also assayed. The maximum absolute weight gain (AWG g/¢sh, 55), best feed conversion ratio (FCR, 1.32), protein retention e⁄ciency (PRE, 40%) and energy retention e⁄ciency (ERE, 76%) were achieved in ¢sh fed on a diet supplemented with 140 mg vitamin E kg À 1 diet (E 140 ). A consistent decline in the hepatic TBARS concentration and an improvement in haematocrit (Hct) and haemoglobin (Hb) were displayed in ¢sh fed on diets with increasing concentrations of vitamin E up to 140 mg kg À 1 (E 0^E140 ), beyond which (E 180^E260 ) a reverse trend in these parameters was evident. Based on the broken-line regression and exponential analyses of AWG, FCR, PRE, ERE, Hb and Hct data, diets for ¢ngerling C. punctatus should contain vitamin E in the range of 140^169 mg kg À 1 to maintain satisfactory ¢sh performance.

Reference values for selected hematological and serum biochemical parameters of Senegalese sole (Solea senegalensisKaup, 1858) juveniles under intensive aquaculture conditions

“…Hypoproteinemia has been associated with malnutrition or malabsorption due to insufficient intake, digestion or absorption (Peres et al, 2003;Sala-Rabanal et al, 2003), high dietary carbohydrates or the presence of antinutritional factors, disease or severe stress (Sala-Rabanal et al, 2003;Andrews et al, 2009). Hyperproteinemia, including increased albumin and/or globulin levels, has been related to stress, inflammatory and innate immune responses (Svoboda et al, 2001;Velisek et al, 2011) or to feeding immunostimulants (Panigrahi et al, 2010;Abdel-Hameid et al, 2012). Serum albumin is also known to increase as a result of sexual maturation (Di Marco et al, 2011).…”

“…Starvation may also reduce blood activity levels of these enzymes due to low metabolic demands (Peres et al, 2012). AST and ALP are usually indicators of liver damage, induced by liver inflammatory processes (Lemarie et al, 1991), chemicals, or lipid peroxidation (Abdel-Hameid et al, 2012). Stress situations are also known to elevate blood AST and ALT levels due to increased energy demands (Lemarie et al, 1991).…”

Dietary niacin requirement of fingerlingChanna punctatus(Bloch)

“…Vitamin-free casein and gelatin were used as dietary protein sources. Experimental diets were prepared by following the method reported by Nassr et al (2012).…”

“…The production of this fish is not organized due to the lack of nutritionally-balanced feeds (Nassr et al, 2017). Although some studies have been focused on nutritional aspect (Marimuthu, Arokiaraj, & Haniffa, 2009;Jindal, Yadava, Jain, & Gupta, 2010;Zehra & Khan, 2012a, 2012bNassr, Khan, & Abidi, 2012;Nassr et al, 2017) of C. punctatus, no published data is available on niacin requirement of this fish. For that reason, the present study was conducted to determine the optimal dietary niacin requirement of C. punctatus based on growth performance, hematological parameters and carcass composition.…”

Evaluation of dietary vitamin E supplementation on growth performance and antioxidant status in hybrid snakehead (Channa argus × Channa maculata )

“…Vitamin E deficiency may give rise to muscular dystrophy, oedema of heart and muscle, anaemia and impaired erythropoiesis, depigmentation, ceroid pigment in the liver (NRC ) and even death. On the other hand, excess doses of α‐tocopherol might also exerted a pro‐oxidant effect on lipid tissues, and this has been demonstrated in rainbow trout Oncorhynchus mykis s (Tokuda & Takeuchi, ), Channa punctatus (Abdel‐Hameid, Abidi, & Khan, ) and grass carp (Li et al., ). Diet supplementation with vitamin E decreases the levels of lipid peroxidation products and protects the integrity of tissues in farmed fish (Lewis‐McCrea & Lall, ; Peng et al., ).…”