Growth of Australian shortfin eel (Anguilla australis) elvers given different dietary protein and lipid levels

Abstract

The Australian short®n eel, Anguilla australis is a potential candidate for intensive aquaculture. The present study was undertaken to evaluate the growth of elvers (5.4 g 0.1 initial weight) fed with diets of varying protein and lipid content, and to assess the potential of using soya-bean meal as a dietary ingredient. A 10 week experiment was conducted at 24 (1.0)°C by rearing ®sh, in 60 L conical ®bre glass tanks using a closed recirculation system. Diets having protein concentrations of 40 or 50% (by dry weight) were tested at three lipid levels (15, 20, 25%); diets being designated P 40 L 15 , P 40 L 20 , P 40 L 25 , P 50 L 15, etc. All these diets contained 5% soya-bean meal. In addition P 50 L 20 diets were formulated to contain 10 and 20% soya-bean meal in the diet (Diets S1 & S2). Short®n eel grew best on the P 50 L 15 diet, with an average speci®c growth rate of 2.26%. Food conservation ratio (FCR) and Protein eciency ratio (PER) ranged from 1.21 (P 50 L 15 ) to 2.12 (P 40 L 25 ), and 0.92 (P 50 L 25 ) to 1.65 (P 50 L 15 ), respectively. Based on all criteria the best growth performance of short®n eel was on the P 50 L 15 diet, followed by P 40 L 20 and P 40 L 15 . At both protein levels ®sh reared on diets with 25% lipid performed poorly. The performance of short®n eel was not aected by the amount of soya-bean meal in the diet, up to a maximum of 20% dietary inclusion. No signi®cant dierences in muscle protein were evident in short®n eel reared on dierent dietary treatments, nor was the lipid content of muscle related to dietary lipid level. KEY WORDS

Effects of salinity and temperature on the growth and survival of New Zealand shortfin,Anguilla australis, and longfin,A. dieffenbachii, glass eels

“…The SGR of shortfin and longfin glass eels observed in the current experiments were similar to those reported for other Anguillid species reared under laboratory conditions (Kamstra & Heinsbroek 1991; De Silva, Gunasekera, Gooley & Ingram 2001a; De Silvia, Gunasekera, Ingram & Dobson 2001b; Ingram et al 2001; Rodriguez et al 2005). Growth rate variability in Anguillids is well documented (Wickins 1985; Jellyman 1997; Ingram et al 2001) and remains an underlying issue facing eel aquaculturists.…”

Effects of salinity and temperature on the growth and survival of New Zealand shortfin,Anguilla australis, and longfin,A. dieffenbachii, glass eels

“…The SGR of shortfin and longfin glass eels observed in the current experiments were similar to those reported for other Anguillid species reared under laboratory conditions (Kamstra & Heinsbroek 1991; De Silva, Gunasekera, Gooley & Ingram 2001a; De Silvia, Gunasekera, Ingram & Dobson 2001b; Ingram et al 2001; Rodriguez et al 2005). Growth rate variability in Anguillids is well documented (Wickins 1985; Jellyman 1997; Ingram et al 2001) and remains an underlying issue facing eel aquaculturists.…”

The effect of dietary methionine concentrations on growth performance of juvenile Nile tilapia (Oreochromis niloticus) fed diets with two different digestible energy levels

“…In the present study, significantly improved growth performance obtained in fish fed with high-energy diet. It is similar with the previous studies (De Sliva et al 2001;Du et al 2005;Martins et al 2007;Chartzifotis et al 2010). Fish generally utilize dietary protein for growth if the energy demands for their basal metabolisms and voluntarily activities are met by the diet (Lee et al 2000).…”

Ultrasound pretreatment and solvent extraction parameters effects on the nutritional characteristics of Indonesian shortfin eel (Anguilla bicolor bicolor) protein concentrate

“…Referring to the SDS-PAGE assessment, the banding pattern of the Indonesian shortfin EPC revealed the existence of 5 different proteins with MWs between 4.00 and 76.00 kDa. The result presents a smaller number of proteins than those documented by De Silva et al (2001) , who observed 17 peptide compounds in Australian short fin eel (Anguila australis Richardson ) cultivated in Australia. The variations in the treatment, solvent, and procedures utilized in the production of EPC is likely responsible for the observed variability in the amino acid profile of the resulting EPC.…”

Effects of salinity and temperature on the growth and survival of New Zealand shortfin,Anguilla australis, and longfin,A. dieffenbachii, glass eels

“…The SGR of shortfin and longfin glass eels observed in the current experiments were similar to those reported for other Anguillid species reared under laboratory conditions (Kamstra & Heinsbroek 1991; De Silva, Gunasekera, Gooley & Ingram 2001a; De Silvia, Gunasekera, Ingram & Dobson 2001b; Ingram et al 2001; Rodriguez et al 2005). Growth rate variability in Anguillids is well documented (Wickins 1985; Jellyman 1997; Ingram et al 2001) and remains an underlying issue facing eel aquaculturists.…”

The effect of dietary methionine concentrations on growth performance of juvenile Nile tilapia (Oreochromis niloticus) fed diets with two different digestible energy levels

“…In the present study, significantly improved growth performance obtained in fish fed with high-energy diet. It is similar with the previous studies (De Sliva et al 2001;Du et al 2005;Martins et al 2007;Chartzifotis et al 2010). Fish generally utilize dietary protein for growth if the energy demands for their basal metabolisms and voluntarily activities are met by the diet (Lee et al 2000).…”

Ultrasound pretreatment and solvent extraction parameters effects on the nutritional characteristics of Indonesian shortfin eel (Anguilla bicolor bicolor) protein concentrate

“…Referring to the SDS-PAGE assessment, the banding pattern of the Indonesian shortfin EPC revealed the existence of 5 different proteins with MWs between 4.00 and 76.00 kDa. The result presents a smaller number of proteins than those documented by De Silva et al (2001) , who observed 17 peptide compounds in Australian short fin eel (Anguila australis Richardson ) cultivated in Australia. The variations in the treatment, solvent, and procedures utilized in the production of EPC is likely responsible for the observed variability in the amino acid profile of the resulting EPC.…”

Effects of salinity and temperature on the growth and survival of New Zealand shortfin,Anguilla australis, and longfin,A. dieffenbachii, glass eels

“…The SGR of shortfin and longfin glass eels observed in the current experiments were similar to those reported for other Anguillid species reared under laboratory conditions (Kamstra & Heinsbroek 1991; De Silva, Gunasekera, Gooley & Ingram 2001a; De Silvia, Gunasekera, Ingram & Dobson 2001b; Ingram et al 2001; Rodriguez et al 2005). Growth rate variability in Anguillids is well documented (Wickins 1985; Jellyman 1997; Ingram et al 2001) and remains an underlying issue facing eel aquaculturists.…”

The effect of dietary methionine concentrations on growth performance of juvenile Nile tilapia (Oreochromis niloticus) fed diets with two different digestible energy levels

“…In the present study, significantly improved growth performance obtained in fish fed with high-energy diet. It is similar with the previous studies (De Sliva et al 2001;Du et al 2005;Martins et al 2007;Chartzifotis et al 2010). Fish generally utilize dietary protein for growth if the energy demands for their basal metabolisms and voluntarily activities are met by the diet (Lee et al 2000).…”

Ultrasound pretreatment and solvent extraction parameters effects on the nutritional characteristics of Indonesian shortfin eel (Anguilla bicolor bicolor) protein concentrate

“…Referring to the SDS-PAGE assessment, the banding pattern of the Indonesian shortfin EPC revealed the existence of 5 different proteins with MWs between 4.00 and 76.00 kDa. The result presents a smaller number of proteins than those documented by De Silva et al (2001) , who observed 17 peptide compounds in Australian short fin eel (Anguila australis Richardson ) cultivated in Australia. The variations in the treatment, solvent, and procedures utilized in the production of EPC is likely responsible for the observed variability in the amino acid profile of the resulting EPC.…”