Growth of Australian shortfin eel (Anguilla Australis) elvers given different dietary protein and lipid levels
Data(s) |
01/01/2001
|
---|---|
Resumo |
The Australian shortfin eel, <i>Anguilla australi</i>s 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 fish, in 60 L conical fibre 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<sub>40</sub>L<sub>15</sub>, P<sub>40</sub>L<sub>20</sub>, P<sub>40</sub>L<sub>25</sub>, P<sub>50</sub>L<sub>15</sub>, etc. All these diets contained 5% soya-bean meal. In addition P<sub>50</sub>L<sub>20</sub> diets were formulated to contain 10 and 20% soya-bean meal in the diet (Diets S1 & S2). Shortfin eel grew best on the P<sub>50</sub>L<sub>15</sub> diet, with an average specific growth rate of 2.26%. Food conservation ratio (FCR) and Protein efficiency ratio (PER) ranged from 1.21 (P<sub>50</sub>L<sub>15</sub>) to 2.12 (P<sub>40</sub>L<sub>25</sub>), and 0.92 (P<sub>50</sub>L<sub>25</sub>) to 1.65 (P<sub>50</sub>L<sub>15</sub>), respectively. Based on all criteria the best growth performance of shortfin eel was on the P<sub>50</sub>L<sub>15</sub> diet, followed by P<sub>40</sub>L<sub>20</sub> and P<sub>40</sub>L<sub>15</sub>. At both protein levels fish reared on diets with 25% lipid performed poorly. The performance of shortfin eel was not affected by the amount of soya-bean meal in the diet, up to a maximum of 20% dietary inclusion. No significant differences in muscle protein were evident in shortfin eel reared on different dietary treatments, nor was the lipid content of muscle related to dietary lipid level.<br /> |
Identificador | |
Idioma(s) |
eng |
Publicador |
Blackwell Science Ltd |
Relação |
http://dro.deakin.edu.au/eserv/DU:30001342/n20011158.pdf http://dx.doi.org/10.1046/j.1365-2095.2001.00156.x |
Direitos |
2001, Blackwell Science Ltd |
Palavras-Chave | #dietary lipid #dietary protein #growth #shortfin eel (Anguilla australis) #soya-bean meal |
Tipo |
Journal Article |