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Growth comparison of the (1+) juvenile sterlet (Acipenser ruthenus) by using experimental and commercial diet
Baránek, V. ; Prokeš, Miroslav ; Baruš, Vlastimil ; Peňáz, Milan ; Cileček, M. ; Mareš, J. ; Jirásek, J. ; Spurný, P.
The aim of this experiment was to check the growth rate of the (1+) juvenile sterlet. The experiment was proceeded during the 42-days period (25 July - 4 September 2005) in the hatchery of the Pohořelice Pond Fisheries. The fish were kept in four flow through tanks. In total, 45 individuals were stocked in each tank. Fish were fed by experimental (44/12) and commercial diet (Pro Aqua Brutfutter 57/15, Skretting) in two repetitions. Our experiment confirmed very good growth ability of the juvenile sterlet, together with low FCR parameter. Sterlet may be considered as an appropriate fish for intensive aquaculture and also, as a native species of the Czech Republic for stocking into Czech running waters.
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Converting of juvenile zander (Sander lucioperca) to artificial diet (preliminary results)
Baránek, V. ; Mareš, J. ; Prokeš, Miroslav ; Jirásek, J. ; Spurný, P.
Weaning success of pond-reared zander (Zander lucioperca) fry was evaluated using three different converting methods: direct converting to dry feed (Bio-Optimal Start 0.5-0.8 mm) – variant A, three– day application of semi-moist feeding mixture on the base of fish – variant B and three-day application of semi-moist mixture + three-day co-feeding of semi-moist mixture and dry feed. These methods were evaluated regarding specific growth rate (SGR), Fulton´s factor of weight condition (FWC), survival and cannibalism. The average onset total length of fish was 35.22 ± 2.15 mm and the average individual weight was 0.31 ± 0.05 g. There were 600 individuals in each circular tank. The initial stock density was 0.62 g.l-1 (2 fish.l-1). The water temperature during this experiment fluctuated in intervals 22 – 24oC. Fish survival during a 14-day period of rearing ranged from 34.33% [C] to 50.33% [A]. Variant A and B were achieved better weaning performance than variant C regarding all parameters.
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Biomorphometry and growth rate of the sterlet (Acipenser ruthenus) in the Czech Republic
Prokeš, Miroslav ; Baruš, Vlastimil ; Peňáz, Milan ; Baránek, V. ; Ošanec, J. ; Šutovský, I.
Two samples of 40 and 30 juvenile specimens of the sterlet (Acipenser ruthenus Linnaeus, 1758) reared in special aquacultural facilities in the Czech Republic (and originating from Russia), and in the Slovak Republic (originating in the Danube Slovak section) were biometrically analysed and compared. Specimens did not differ in the maximum-minimum range of their meristic characters from the description presented for sterlet, but differ significantly in mean values in 4 (of 6) meristic and 14 (of 27) metric characters compared. On the basis of UPGMA it was found that the sample of sterlet from the CR, clusters well with other samples of the sterlet population. On the basis of PCA affinities of sterlet samples with hybrid samples of bester (A. ruthenus x Huso huso) were found. In comparative rearing of juvenile sterlet and Siberian sturgeon (Acipenser baerii) under identical experimental condition intensive growth rates in the Siberian sturgeon were found.
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Growth of the sterlet (Acipenser ruthenus) under conditions of Pohořelice Pond Fisheries
Baránek, V. ; Prokeš, Miroslav ; Baruš, Vlastimil ; Peňáz, Milan ; Mareš, J. ; Spurný, P. ; Němec, R.
Growth results of the sterlet (Acipenser ruthenus) reared at the Pohořelice Pond Fisheries were observed in 2003 and 2004 and subsequently analysed. During the period 28 July ů 2 September 2003 a feeding experiment (sterlet of age 1+ and 4+, 5+) was performed in which very good growth parameters were achieved: In the age category 1+ (initial mean weight of 99,5; 71,2 and 53,8 g) using DFR 1,6; 1,7; 2,1 % respectively, SWGR 1,02; 1,36; 0,91 %.d-1 , respectively and FCR 1,45; 1,10 and 2,38, respectively. In the age category 4+, 5+ (initial mean weight of 316,9; 375,0 and 478,85 g) using DFR 1,3; 1,1 and 0,9 %, respectively, SWGR 0,88; 0,73 and 0,59 %.d-1 , respectively and FCR 1,35; 1,39 and 1,42, respectively. On the basis of these results, sterlet may be considered to be an appropriate fish for intensive aquaculture and, as a native species for the Czech Republic, also for stocking into Czech running waters.
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Rearing of the zander (Sander lucioperca) stock material under controlled conditions (preliminary results)
Baránek, V. ; Mareš, J. ; Spurný, P. ; Prokeš, Miroslav ; Baruš, Vlastimil ; Němec, M.
The aim of this study was to check the possibilities of exploitation of summer zander (Sander lucioperca) fry for production of stock material under controlled conditions. Two groups of these fish were converted from natural diet to artificial diet using the semi-moist feeding mixtures (variant A) and trout feed (Dan-Ex 1352 - variant B). The average total length of imported fish was 44,3 mm and the average idividual weight was 0,606 g. There were 255 individuals in each tank. The initial stock density was 2,34 g.l-1 (3,86 ks.l-1). The water temperarute during this experiment fluctuated in intervals 21 ů 23 oC. Our simple experiment confirmed possibility of exploitation of summer zander fry to intensive rearing of stock material.
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