Production effect of various feeds on two size classes of juvenile tench (Tinca tinca) under the conditions of intensive rearing
2007
Mares, J.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Zoologie, Rybarstvi, Hydrobiologie a Vcelarstvi | Jirasek, J.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Zoologie, Rybarstvi, Hydrobiologie a Vcelarstvi | Baranek, V.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Zoologie, Rybarstvi, Hydrobiologie a Vcelarstvi | Fiala, J.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Zoologie, Rybarstvi, Hydrobiologie a Vcelarstvi | Kopp, R.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Zoologie, Rybarstvi, Hydrobiologie a Vcelarstvi
Two size classes of tench juveniles with initial individual weights of 0.8 (group L) and 1.2 g (group H), respectively, were reared in flow-through aquaria connected to a recirculation system during a period of 63 days. Three feeds (KARPICO Supreme 7 Ex, ASTA 2, L05/CH) with nutrient content of 37/8, 42/7 and 35/7 (% proteins/ fat) were used in the experiment. The feed conversion ratio (FCR) and specific growth rate (SGR) depended on the size class and feed used. They ranged from 1.84 to 4.15 and from 0.70 to 1.49 %/d, respectively. Better values were achieved in the group H than in the group L, independently of the diet used (FCR 1.84-3.53 and SGR 0.83-1.49 %/d). The best results were achieved when using ASTA 2 feed (FCR: 2.05 (group L) and 1.84 (group H); SGR: 1.36 (group L) and 1.49%/d (group H). In conclusion, the small fry did not improve either its growth or its feed conversion efficiency later in the juvenile period and for this reason, it shouldn't be used for further rearing.
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