Dietary ascorbic acid requirement of cobia, Rachycentron canadum Linneaus

Abstract

A 10‐week feeding trial was conducted to determine the optimal requirement of cobia (Rachycentron canadum Linneaus) for dietary ascorbic acid (AA). Graded levels of L‐ascorbyl‐2‐polyphosphate (LAPP) were supplemented in basal diet to formulate six semi‐purified diets containing 2.70 (the control diet), 8.47, 28.3, 80.6, 241 and 733 mg AA equivalent kg−1 diet, respectively. Each diet was randomly fed to triplicate groups of fish in flow‐through plastic tanks (300 L), and each tank was stocked with 25 fish with average initial weight of 4.59 ± 0.36 g. Observed deficiency signs included poor growth, higher mortality and lower feeding rate (FR) in the fish of the control group. Fish fed the control diet had significantly lower weight gain (WG), lower feed efficiency ratio (FER) and lower tissue AA concentrations in fish liver and muscle. With the increase of dietary AA, the survival, WG, FER, hepatic and muscular AA concentrations of cobia significantly increased and then levelled off. The dietary AA requirement of cobia was estimated to be 44.7 mg kg−1 based on WG, 53.9 mg kg−1 or 104 mg kg−1 based on either hepatic or muscular AA concentration, respectively.

Vitamin C requirement of adult genetically improved farmed tilapia, Oreochromis niloticus

“…Our results were in accordance with the findings of Xiao et al (2010), who reported that dietary vitamin C had no effects on the whole-body composition of cobia. However, in other fish species, body lipid content is significantly affected by dietary vitamin C. Karabulut et al (2011) reported that body lipid content of brook trout fed 500 mg kg -1 vitamin C was significantly lower than that of fish fed the control diet.…”

Effect of previous ascorbic acid treatment on the fatty acid profile of cobia (<i>Rachycentron canadum</i>) fillets during frozen storage

“…Cobia is a promising candidate for aquaculture trade because of its rapid growth rate, reaching up to 4-6 kg in a year, hardiness, efficient feed conversion, excellent flesh quality and comparatively low production costs (Franks et al, 1999;Liao et al, 2004). Therefore, research has been recently carried out to assess the optimal commercial feeds to be employed (Xiao et al, 2010;Trushenski et al, 2011). Related to cobia composition studies, previous research has focused on proximate analysis (Duncan et al, 2007;Liu et al, 2009) and fatty acid composition description (Khristoferzen, 1969;Kotb et al, 1991;Liu et al, 2009).…”

“…The effect of AA on farmed cobia fish has recently been studied according to the search for performed diets (Xiao et al, 2010); AA incorporation in the diet and its effect on different growing and developing parameters was analyzed. It could be observed that an increasing AA content in the diet could lead to an increased survival, weight gain, feed efficiency ratio and a muscular and hepatic AA concentration.…”

Effects of Dietary Supplementation of a Citrus By-product on Growth Performance, Innate Immunity and Tolerance of Low Water Temperature in Red Seabream Pagrus major

“…Yellow croaker C , 20-30% (Ai et al, 2006;Eo and Lee, 2008). Xiao et al, 2010). C , (Dabrowski et al, 1994;Gouillou-Coustans et al, 1998).…”

“…C , (Dabrowski et al, 1994;Gouillou-Coustans et al, 1998). Cobia C (35% ascorbic acid equivalent, China) (0, 10, 30, 90, 270, 810 mg/kg) 10 , C (Xiao et al, 2010). ,…”