Hematological and Biochemical Indices of Blood in Wels (Silurus glanis L.) from Intensive Aquaculture

Abstract

The objective of the present study was to determine the values of basic blood indicators and of biochemical plasma indicators of we Is (Si/urlls glanis L.) intensively bred in warmed power station water without natural feeds. The study included 8 feeding experiments using 4 imported (ALMA. BioMar) and 4 domestic pelle ted feeds with different protein (40 -491ft) and fat 18-22'7c) content. The experiment involved 3265 one-year-old she at fish (Su I) of 209 and 295 g average individual weight (in 1996 and 1997. respectively). Analysed were 56 fish of 15 months (1997) and 17 months (1996) Significant changes IP < 0.05) in hematological indicators were found in fish fed the PDl feed mixture and very significant (P < 0.0 I) differences in the Chol a TL values in fish fed BioMar and W 97. These data characterise the adaptation reaction of the internal environment of wels to conditions of intensive aquaculture with warmed water and the nutritional value of used feeds. Intensive aijltacliiture. Sill/rus glanis. wels. pelleted feed. blood indicawl'S.A good adaptability of wels (Silltrlts gianis L.) to various ecological, food and technological conditions enables its farming diversity in various production systems. Besides pond and combined culture, the whole wels production cycle from fry to marketable fish can be run in special facilities with controlled water temperature regime and utilizing commercial feeds (J i n1 s e k et al. 1998).The aim of the experiments performed in 1996 and 1997 was to test the production of twoyear-old wels of lower jndividual body mass in intensive aquaCUlture, The achieved production results are presented in the study of linlsek and r--lareS (1998). i\latcrials and MethodsThe experiments were carried out in the fish farm TisO\'u ICeske f) b:irst\i Mari:inske Lazne PIC). Heated powerplant effluents were used. Water temperature was controlled using the water from the Ohre river. Partly shaded concrete raceways (production volume 3 m', int10w rate 2 l·s·1 ) were utilized for the experiments. The production and physiological effects of --1 imported pelleted feed produced by ALl\IA and BioMar. one domestic pelleted feed PD 2 and 3 experimental diets of own prescriptions I indicated A. Band \V97) were tested in two replicates. The feeds differred in protein (40 -46 '7r) and lipid content (8 -22 '7(). All feeds were produced by extrusion.

Replacement of fish meal with rapeseed protein concentrate in diets fed to wels catfish (Silurus glanis L.)

“…The haematocrit baseline value corresponds to the value determined in our study (Table 5). Detected blood serum values of triglycerides, glucose and protein, however, differ from values cited by Jirásek et al. (1998).…”

“…Average blood serum values determined were total lipids 9.95 mM L −1 , glucose 49.39 mM L −1 and total protein 29.89 g L −1 . We assume that differences between values published by Jirásek et al. (1998) and in the present study reflect the different compositions of used diets and possible differences in starvation time before sampling.…”

“…(1998) and in the present study reflect the different compositions of used diets and possible differences in starvation time before sampling. It is known that blood serum values generally represent the nutrient composition of a diet (Jirásek et al. 1998) and that starvation time before sampling can have a significant influence on plasma glucose, triglycerides and protein concentrations (Shi et al.…”

Mesquite bean ( Prosopis juliflora ) meal in diets of Nile tilapia ( Oreochromis niloticus ): Nutritional value, growth, physiological responses and health

“…It should also be mentioned that haematological values can be affected not only by growth but also by ecophysiological conditions (Ranzani‐Paiva et al, ). Diet quality and quantity has significant effects on fish physiology, and, thus, may interfere with haematological variables (Jirásek, Mareš, & Palíková, ).…”

Rate and State Friction as a Spatially Regularized Transient Viscous Flow Law

“…de Borst and Mhlhaus (1992); Peerlings et al (1996); Jirásek (1998); Bažant and Jirásek (2002); Engelen et al (2003); Jirásek andRolshoven (2009b, 2009a); Burghardt et al (2012); Lyakhovsky et al (2011); Ben-Zion (2014b, 2014a); Lyakhovsky et al (2016); Kurzon et al (2019Kurzon et al ( , 2020; Kiefer et al (2018); Abdallah et al (2020).…”