Effects of feeding rate and frequency on growth performance of yearling great sturgeon, Huso huso

Abstract

Growth and survival of yearling great sturgeon, Huso huso, were determined at three different feeding rates and three different frequencies. Feeding rates were 2, 3, and 4% body weight day -1 , and these daily rations were offered in 3, 4, and 5 fractions over the day. Sturgeon were offered to 18 tanks with 10 fish each were distributed to each of the 3 feeding rates and 3 frequencies. Thus, a 3x3 experimental design was used with two replicates per treatment involving a total of 18 tanks (stocking density = 10 fish per tank). Initial average body weights of the yearlings were 900 ± 9.2 g. Fish were kept at 23 ± 1.5 ºC in rectangular tanks and fed one commercial diet (40-42 % protein, 12-14% fat, 10-11% moisture and 10% ash). After about 16 weeks of feeding (108 experimental days), final length, weight and feed conversion were determined: all were significantly affected by feeding rate and feeding frequency (P<0.05). The highest feed conversion ratio (FCR) was observed at a ration of 4% body weight (BW) day -1 with the daily ration being given in 5 portions over the day, while maximum length and weight was obtained with a ration of 2% BWday -1 and the daily ration being spread over 3 feeding times. No mortalities occurred during the 16-weeks trial. Results show that the optimum feeding rate and feeding frequency for this size group of great sturgeon yearlings would appear at a feeding rate at 2% BW day -1 with the daily amount being offered in three portions over the day.

Optimum ration level for better growth, conversion efficiencies and body composition of fingerling Heteropneustes fossilis (Bloch)

“…The results of our feeding trial indicate that the allocation of ration in the range of 5.9-6.8% of the BW day -1 , corresponding to 2.36-2.72 g protein and 88.20-101.66 MJ DE of the diet day -1 , is the optimum diet for a better growth of fingerling H. fossilis. This is higher than the ration allocation reported for striped bass, Morone saxatilis (1.7; Piper et al 1982), Chinese long snout catfish, L. longirostris (1.8; Han et al 2004), Atlantic salmon, Salmo salar (2; Austreng et al 1987), green back flounder (2; Verbeeten et al 1999), Nile tilapia, O. niloticus (2; El-Saidy and Gaber 2005), great sturgeon, Huso huso (2; Mohseni et al 2006), tropical bagrid catfish, M. nemurus (2.5; Ng et al 2000), walking catfish, C. batrachus (3; Hassan and Jafri 1994), Clariid catfish hybrid, Clarias gariepinus 9 Hetrobranchus bidorsalis (3; Adebayo et al 2000), yellow flounder, L. ferruginea (3; Puvanendran et al 2003), European sea bass, Dicentrarchus labrax (3-3.5; Eroldogan et al 2004), Cuneate drum, N. miichthioides (5; Wang et al 2007), mrigal, C. mrigala (5-5.5; Khan et al 2004), in the range reported for African catfish, C. gariepinus (6; Al-Hafedh and Ali 2004), white sturgeon, Acipensor transmontanus (6; Deng et al 2003) and lower than the values for European sea bass, D. labrax (7.4; Russell et al 1996), African catfish, C. gariepinus (10; Hogendoorn et al 1983), Tambaqui, C. macropomum (10; Silva et al 2007) and brown trout, Salmo trutta (11.3; Elliot 1975). Since water temperature influences body temperature, the growth rate and metabolic rate of fish reared at different temperatures are expected to have different values for optimum feeding rate (Jobling 1983;Borghetti and Canzi 1993;Xie et al 1997).…”

Effects of Photoperiod Manipulation on Growth Performance and Hematological Responses of Juvenile Caspian Roach Rutilus rutilus caspicus

“…These conditions can include the physical culture environment (temperature, salinity, light intensity and photoperiod) and general nutritional parameters such as diet composition, ration and feeding frequency (Mohseni et al, 2006). The strategy of their rearing condition will help us to gain best results in their culture and can affect their growth and survival.…”

Effects of feeding rates and feeding frequency on the growth performances of juvenile hybrid sturgeon, Acipenser schrenckii Brandt♀×A. baeri Brandt♂

“…Feeding frequency should target optimal feed intake and the growth (Mohseni et al, 2006). Several studies have reported the effects of feeding rate on the growth performance of white sturgeon (Deng et al, 2003;Hung et al, 1995), Atlantic sturgeon (Acipenser oxyrinchus) (Jodun, 2004;Kelly and Arnold, 1999), shortnose sturgeon (Acipenser brevirostrum) (Giberson and Litvak, 2003), Persian sturgeon (Acipenser persicus) (Yousefpour et al, 1998), and great sturgeon (Mohseni et al, 2006;Pourali et al, Aquaculture 448 (2015) …”