[The nature of changes of some immunophysiological characteristics in bream (Abramis brama) infected with plerocercoids (Ligula intestinalis) at various stages of parasite development].

The data from studies of the antimicrobial properties of blood serum, the content of total lipids, and antioxidant activity of immunocompetent tissues and organs of breams Abramis brama infected with plerocercoids Ligula intestinalis depending on the phase of development of the parasite are presented. The quantitative characteristics of the studied parameters are determined.

[Dependence of the infestation intensity of zope Abramis ballerus with Dactylogyrus chranilowi Bychowsky, 1931 on the level of antimicrobial effect of the host's blood serum].

Infestation of zope Abramis ballerus with Dactylogyrus chranilowi Bychowsky, 1931 depending on the bactericidal activity of the host's blood serum was investigated. Connection of the infestation intensity with the level of antimicrobial effect of the host's blood serum is demonstrated.

[Influence of stress hormones (adrenalin and glucocorticoids) on the infestation rate of the carp Cyprinus carpio L. by Dactylogyrus sp. (Monogenoidea)].

Influence of adrenaline, hydrocortisone, and prednisolone on the infestation rate of the carp Cyprinus carpio by Dactylogyrus sp. is investigated, according to the analysis of the abudance index of parasites. Introduction of these hormones into experimental fish resulted in the increase of the abudance index of dactylogyrids.

[The effect of ligula intestinalis on some lipid exchange indexes of the spleen of the host, bream abramis brama of different age].

The results of the comparative analysis of the spleen in healthy individuals of bream Abramis brama and those infected by the Ligula intestinalis plerocercoids are given. Two age groups of bream were studied. The comparison was carried out by the index of common lipids (CL), the content of common lipids, the intensity of lipid peroxidation (POL), and the common antioxidant activity (CAA).

[Peculiarities of lipid peroxidation indices in Ligula intestinalis (Cestoda: Pseudophyllidea) and its host--Abramis brama (L.)].

A comparative analysis of indices of peroxidation lipids in tissues of Ligula inteslinalis plerocercoids and in the intermediate fish host, the bream Abramis brama, was performed for the content of common lipids (CL), malonate di-aldehyde (MDA), which is a product of lipid peroxidation (POL), and common antioxidate activity (CAA). The dependence of indices upon size of parasites is recovered. The long-sized parasites had higher rate of MDA and intense CAA.

[The effect of carbophos on the immunocompetent cells and structure of the spleen in the carp Cyprinus carpio].

The response of immunocompetent cells of underyearling carps on different concentrations (0.05, 0.1, 1.