Values of Haematological Indices of Wels (Silurus glanis L.) in Relationship to the Level of Nutrition during the Pre-spawning Period

Z Svobodová ,V Vajcová,J Hamáčková ,Helena Modrá ,Jitka Kolářová ,J Kozák

doi:10.2754/avb199867040235

Abstract

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Highlights

The goal of this paper was to evaluate the effect of different nutrition levels on condition and health expressed by means of selected haematological indices of both males and females of wels (Silurus glanis L.) during the pre-spawning period
In case of brood wels kept in ponds for artificial reproduction, the pre-spawning period is considered extremely important for reproductive results, and above all from the point of view of fish recovering after reproduction
Our evaluation of wels males and females kept at different nutrition levels showed significant differences in total protein concentration in blood plasma. with the benefit for groups kept at higher nutrition level

Summary

Introduction

The goal of this paper was to evaluate the effect of different nutrition levels on condition and health expressed by means of selected haematological indices of both males and females of wels (Silurus glanis L.) during the pre-spawning period. 15 males and females were checked in 1995 while 18 females were checked in 1997 Both males and females which had been reared during the 1995 and/or 1997 pre-spawning period with higher level of nutrition reached expressively higher relative weight gain and signiticantly higher total protein (TP) in blood plasma (P < 0.05: P < 0.0 I) compared to those with lower level of nutrition. Results gained report for a more favourable condition of brood wels reared at higher nutrition level (ratio of fodder fish biomass: wels biomass 2.3: I - 3.2: I) during the pre-spawning period and a higher non-specific disease resistance may be anticipated . Relationships between nutrition level and values of production, haematological and reproductive characters of the fish under study were discussed Both the rearing and the nutrition level of fish during their pre-spawning period are important factors affecting quality of gametes and results of reproduction. Reproduction is considered among important physiological stress of the fish organism

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Conclusion