EFFECTS OF FEEDING REGIME ON GROWTH FEED CONVERSION AND SIZE VARIATION OF Silurus glanis

The Influence of Feeding Level on Growth Performances of European Catfish (Silurus glanis L., 1758) Juveniles under Recirculating Water Conditions

“…In our study, PER presented almost a constant intergroups value of 2.50 (±0.04), indicating the higher efficiency with which the catfish have converted nutrients from feed into body mass and consequently, in nutrients for human food supply. Our results reinforced the data obtained by, Havasi et al (2015) in the experiment presented above, on European catfish juveniles fed with a commercial diet having 49 % crude protein, with good results of the feed intake (FCR=0.77±0.07, PER=2.7±0.2) for the 3 times/day of the meal's frequency. In another study about four experimental diets with different percentages of protein, during a 112 days trial on European catfish fingerlings (46,4 g), Bekcan et al (2006) obtained values quite similar to ours of the feed intake for the group fed with 40 % protein level (FCR = 0.97 ± 0.010, PER = 2.62 ± 0.028), but smaller SGR=0.74 ± 0.002 %/day in the conditions of ad libitum distribution of the food, twice/day.…”

“…Correlating with the similarity of the recorded R 2 values, this situation suggesting a possible competition for food even in the experimental variant with higher feeding rate R2. Taking into account our results reported to those found by Havasi et al (2015), the continuous repartition of the daily food could be a better solution for catfish feeding because, besides elevated feeding rates, increasing the feeding frequency could be the answer in order to obtain a homogenous population in aggressive specie like Silurus glanis. The coefficient of variation (CV %) recorded a larger variation by analysing the final moment (R1, 27.73 %→30.34% > R2, 23.87%→24.44%).…”

“…Therefore, adjusting the optimum feeding rate, according to the fish species, fish size and rearing system, is a goal to achieve in a RAS (Timmons et al, 2002). Practical aspects of growth rate and feeding regime of Silurus glanis species in intensive conditions are increasingly being investigated in the last years (Hilge, 1985;Bekcan et al, 2006; GRECU et al Placinta et al, 2012;Florczyk et al, 2014;Havasi et al, 2015) showing a robust and easy-adaptative fish (Linhart et al, 2002) as long the water quality is maintaining in optimal intervals. In general, these are important arguments for fish being raised in RAS because high growth rate increases production turnover as soon as fish reach the market size.…”

Equally weighted multivariate optimization of feeding rate for sub‐yearling great sturgeon (Huso huso) using desirability function model

“…A very important factor for ensuring the success of livestock, poultry, and aquatic organisms farming, is to determine the appropriate feeding rate in order to achieve optimal and economic growth rates (Hasan, 2000). However, it might be difficult to successfully determine optimum feeding rate for fishes since it is dependent on numerous interrelated factors including diet quality, environmental conditions, stocking density, feeding frequency, selected species, initial weight, and animal size (Brett & Groves, 1979; Havasi et al, 2015; Jobling, 1995; Silva, Gomes, & Brandão, 2007). To date, a large body of research has attempted to determine optimal feeding rate and frequency for cultural aquatic animals, including different sturgeon species.…”