Production effect of various feeds on two size classes of juvenile tench (Tinca tinca) under the conditions of intensive rearing

Abstract

The experimental rearing of tench (Tinca tinca) juveniles of two size classes with initial individual weight of 0.8 and 1.2 g was performed into flow-through aquaria connected to 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. Achieved values of production indicators – feed conversion ratio (FCR) and specific growth rate (SGR) ranged from 1.84 to 4.15 and from 0.70 to 1.49 %.d–1, respectively in relationship to the size class and feed used. More favourable values were achieved with the bigger size class regardless to the diet used (FCR 1.84–3.53 and SGR 0.83–1.49 %.d–1) and the best results were achieved when using ASTA 2 feed (2.05 and 1.84 or more precisely 1.36 and 1.49%.d–1).

Production effect of different commercial feeds on juvenile tench (Tinca tinca L.) under the intensive rearing conditions

“…The FCR was decreased with increasing growth rate. The highest FCR was reported in variant A, this value was 42% higher than value of FCR in variant C. In the presented experiment the FCR reached lower values than that reported for tench by Mareš et al (2007). The values of PER were similar trend as values of FCR, the better values of PER were caused be higher growth rate.…”

“…Quirós et al (2003) reached the highest SWGR with commercial feed used for Sea-bass (Dibaq). Values of the Fulton's factor of weight condition (FWC) ranged within 2.54-2.90 were higher than that reported Mareš et al (2007) and Quirós et al (2003). The highest value of FWC was found for fry fed with Pro Aqua Brutff uter.…”

“…Other authors (Wolnicki et al, 2005;Mareš et al, 2007) also obtained the high survival in the feeding test with juvenile tench, as contrasted to papers (Ouirós and Alvriňo, 1998;Quirós et al, 2003), where survival for tench was unsatisfactory with feeding commercial diets. Feeding dry diets result in satisfactory survival for other juvenile cyprinids (Wolnicki, 1996;Myszkowski et al, 2002).…”

“…The body fat deposition in variant B was superior by 18 %, compared to the variant A. The body fat deposition was higher these commercial feed than that reported for tench fry Mareš et al (2007), the deposition fat was within the range 4.48-6.74 %.…”

“…the diff erences of weight growth intensity could be caused by initial body weight. Mareš et al (2007) reached the highest SWGR values for fry fed with the ASTA, which had the highest content of protein and fat of diets used in their feeding experiment. Quirós et al (2003) reached the highest SWGR with commercial feed used for Sea-bass (Dibaq).…”