26 research outputs found
Dynamics of yolk sac and oil droplet utilization and behavioural aspects of swim bladder inflation in burbot, Lota lota L., larvae during the first days of life, under laboratory conditions
Application of different activating solutions to in vitro fertilization of crucian carp, Carassius carassius (L.), eggs
Changes in European eel ovary development and body and ovary chemistry during stimulated maturation under controlled conditions: preliminary data
Artificial spawning of common tench Tinca tinca (Linnaeus, 1758), obtained from wild and domestic stocks
Effect of two commercial preparations containing different GnRH analogues with dopamine antagonists on barbel Barbus barbus (L.) sperm quantity and quality
The effects of cadmium and copper on embryonic and larval development of ide Leuciscus idus L.
Composition of seminal plasma and ovarian fluid in Ide Leuciscus idus and Northern pike Esox lucius
Cortical reaction as an egg quality indicator in artificial reproduction of pikeperch, Sander lucioperca
The aim of this study was to investigate the process of the cortical reaction in eggs of pikeperch, Sander lucioperca (L.), as well as the application of microscopic assessment of this process in egg quality evaluation. The analysis was carried out with eggs obtained from 10 females by artificial reproduction, in which hormonal stimulation with hCG was applied. Subsequently, each sample of eggs (separately from each female fish) was analysed. The analysis included observation of the cortical reaction and the process of egg swelling, and determination of the effect of temperature (12, 14 and 16°C) and the presence of spermatozoa on the cortical reaction. The results indicate that the cortical reaction in pikeperch eggs is quite violent, resulting in visible deformation of eggs between 3 and 5 min after activation. No effect of temperature or the presence of spermatozoa on the cortical reaction was observed. A strong correlation was recorded for the percentage of egg deformations observed and embryo survival rate. The described method of determination of pikeperch egg quality (based on egg deformation rate between 3 and 5 min after activation) may be highly useful, both in scientific research (where high-quality eggs are required) and in hatchery practice.</jats:p