Growth performance, feed intake and morphology of juvenile European catfish, Silurus glanis (L.) fed diets containing different protein and lipid levels

Florczyk, Krzysztof; Mazurkiewicz, Jan; Przybylska, Katarzyna; Ulikowski, Dariusz; Szczepkowski, M.; Andrzejewski, W.; Golski, Janusz

doi:10.1007/s10499-013-9667-0

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…A proper feeding level is an important component for the success of European catfish production and must take into consideration besides the production system type, the fish life stage (Florczyk et al, 2014, Placinta et al, 2012, fish welfare (Dediu et al, 2010), the water's temperature and quality (Muscalu et al, 2010). For example, Florczyk et al, (2014) testing 3 diets containing different protein/lipid levels on smaller size of Silurus glanis fingerlings (4.2±0.15 g), for 50 days, with continuous administration of the food (level feeding not specified, so supposing ad libitum) obtained, at the trial finish, the best results for SGR (2.63±0.04 %/day) in the group 45/20, the most favourable PER (2.36±0.14) in the group The Influence of Feeding Level on Growth Performances of European Catfish (Silurus glanis L., 1758) Juveniles (37/12) even if FCR in all 3 groups (45/20, 45/15 and 37/12) was quasi-invariable.…”

Section: Growth Performancesmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Grecu¹,

Dediu²,

Docan³

et al. 2019

BUASVMCN-ASB

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The study was carried out with one summer-old Silurus glanis juveniles, having the mean size 23.04±2.05 cm and weight 73.84±19.12 g, reared in recirculating water condition, in order to assess the impact of feeding level on growth performances and body size variation of fish. Two feeding levels were tested (R1=1.5% BW/day and R2=2.5% BW/day), in duplicate, during 6 weeks, and the biomass gain (BG), feed conversion ratio (FCR), specific growth rate (SGR), protein efficiency ratio (PER), morphometric relationship between length-weight (LWR) and coefficient of variation (CV) were assessed. Data revealed that the overall mean weight of the biomass was doubled during the trial, from 14.92 kg to 31.17 kg, and the body growth significantly increases with the increment of the feeding rate (13.48 kg in R1 and 17.70 kg in R2), underlying the good potential of the species, at this life stage, for fast-growing under intense conditions. The calculated SGR in R1 was 1.43%/day and in R2, significantly higher, as 2.05 %/day, for the almost similar values of FCR (0.74 g/g) and PER (2.50 g/g) recorded between the treatments.

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Section: Growth Performancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Grecu¹,

Dediu²,

Docan³

et al. 2019

BUASVMCN-ASB

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“…A number of works focus on searching for optimal diet composition during catfish farming. Thus, it has been found that catfish fed on high‐protein feeds are characterized by a rapid growth rate and high survival under aquaculture conditions (Florczyk et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

First insights into the activity of major digestive enzymes in the intestine of the European catfish Silurus glanis and protective anti‐enzymatic potential of its gut parasite Silurotaenia siluri

Фролова

Извеков

Извекова

2023

Journal of Fish Biology

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The European catfish Silurus glanis is attracting growing interest as an object of fisheries and aquaculture, which is reinforced by the expansion of its natural range under climate change. Shaping the effective exploitation strategy for this valuable species requires detailed knowledge of its biology, including feeding and digestion processes, especially near the natural limits of the species range. Meanwhile, the digestion physiology of the European catfish remains poorly explored, including the activity of major digestive enzymes and the possible effect of intestinal parasites on this activity. In this regard, the activity of proteinases and α‐amylase in the intestinal mucosa of the catfish was studied. Adult catfish were collected in the Rybinsk reservoir (Upper Volga) located close to the northern limit of the species range. It was shown that all subclasses of intestinal digestive proteinases, including serine proteinases, metalloproteases and cysteine (thiol) proteinases, function in the gut mucosa of the catfish. The mucosal levels of total proteolytic activity depended on fish size, in contrast to those of trypsin, chymotrypsin and α‐amylase. The level of chymotrypsin activity was significantly higher than that of trypsin activity. It was also found that the incubation medium and extract of the cestodes Silurotaenia siluri parasitizing the catfish gut had a significant inhibitory effect on the activity of serine proteases (trypsin and chymotrypsin) operating in the intestines of the host fish.

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Example of the application the microsatellite DNA fragments in the study of farmed European catfish (Silurus glanis, L.) broodstock

Kuciński¹,

Liszewski²,

Krzyoeków³

et al. 2015

Archives of Polish Fisheries

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Acta Technologica Agriculturae 1/2016Dušan Páleš et al.The most effective way for determination of curves for practical use is to use a set of control points. These control points can be accompanied by other restriction for the curve, for example boundary conditions or conditions for curve continuity (Sederberg, 2012). When a smooth curve runs only through some control points, we refer to curve approximation. The B-spline curve is one of such approximation curves and is addressed in this contribution. A special case of the B-spline curve is the Bézier curve Rédl et al., 2014). The B-spline curve is applied to a set of control points in a space, which were obtained by measurement of real vehicle movement on a slope (Rédl, 2007(Rédl, , 2008. Data were processed into the resulting trajectory (Rédl, 2012;Rédl and Kučera, 2008). Except for this, the movement of the vehicle was simulated using motion equations (Rédl, 2003;Rédl and Kročko, 2007). B-spline basis functionsBézier basis functions known as Bernstein polynomials are used in a formula as a weighting function for parametric representation of the curve (Shene, 2014). B-spline basis functions are applied similarly, although they are more complicated. They have two different properties in comparison with Bézier basis functions and these are: 1) solitary curve is divided by knots, 2) basis functions are not nonzero on the whole area. Every B-spline basis function is nonzero only on several neighbouring subintervals and thereby it is changed only locally, so the change of one control point influences only the near region around it and not the whole curve.These numbers are called knots, the set U is called the knot vector, and the half-opened interval 〈u i , u i + 1 ) is the i-th knot span. Seeing that knots u i may be equal, some knot spans may not exist, thus they are zero. If the knot u i appears p times, hence u i = u i + 1 = ... = u i + p -1 , where p >1, u i is a multiple knot of multiplicity p, written as u i (p). If u i is only a solitary knot, it is also called a simple knot. If the knots are equally spaced, i.e. (u i + 1 -u i ) = constant, for every 0 ≤ i ≤ (m -1), the knot vector or knot sequence is said uniform, otherwise it is non-uniform.Knots can be considered as division points that subdivide the interval 〈u 0 , u m 〉 into knot spans. All B-spline basis functions are supposed to have their domain on 〈u 0 , u m 〉. We will use u 0 = 0 and u m = 1.To define B-spline basis functions, we need one more parameter k, which gives the degree of these basis functions. Recursive formula is defined as follows:This definition is usually referred to as the Cox-de Boor recursion formula. If the degree is zero, i.e. k = 0, these basis functions are all step functions that follows from Eq. (1). N i, 0 (u) = 1 is only in the i-th knot span 〈u i , u i + 1 ). For example, if we have four knots u 0 = 0, u 1 = 1, u 2 = 2 and u 3 = 3, knot spans 0, 1 and 2 are 〈0, 1), 〈1, 2) and 〈2, 3), and the basis functions of degree 0 are N 0, 0 (u) = 1 on interval 〈0, 1) Acta In this co...

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Growth performance, feed intake and morphology of juvenile European catfish, Silurus glanis (L.) fed diets containing different protein and lipid levels

Cited by 6 publications

References 23 publications

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

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

First insights into the activity of major digestive enzymes in the intestine of the European catfish Silurus glanis and protective anti‐enzymatic potential of its gut parasite Silurotaenia siluri

Example of the application the microsatellite DNA fragments in the study of farmed European catfish (Silurus glanis, L.) broodstock

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