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Headaches are a common, but under-recognized symptom of rheumatic diseases. They can result from intracranial (inflammation, thrombosis, etc.) or extracranial pathology, such as irritation, or degeneration of anatomically related structures such as the eyes, neck, and sinuses. In addition, patients with rheumatologic disorders have the same tendencies as the general population to develop primary headaches. While the latter are benign in nature, the former type of headaches may signal disease manifestation, progression, or complication. Information on headache syndromes related to rheumatologic disorders as well as understanding of underlying disease processes and mechanisms is important. This will help to improve diagnostics and treatment of rheumatic diseases.

The present article is dedicated to the 90th anniversary of the foundation of the Department of Ichthyology and Hydrobiology in Saint-Petersburg State University, as well as to the formation of ichthyological school by talented scientist and bestow teacher Professor Nikolai Lvovich Gerbilcky. The results of fundamental works which were fulfilled during much time when using the principle of ecological histophysiological analysis laid by N.L. Gerbilsky are shown in this article. Also the results of the analysis of species adaptations connecting with the reproduction of fishes and with survival of its progeny when using this new method were presented. The basic principles of the biotechnology of fish reproduction in industrial conditions were created because of these results. The sphere of the principles of morphological-physiological analysis were expended and continued by following leaders of the Department and Laboratories – the schoolers and the followers of N.L. Gerbilsky. The mechanisms of hormonal regulation of fish’s gametogenesis were studied and the patterns of phase changes in the regulation and ecological – physiological staging of fish’s gametogenesis were opened by B.N. Kazansky. Fundamental investigations of osmotic and ionic regulation in different species of acipenserids and salmonids from the perspective of ecological morphological physiology when using present experimental methods leaded up to the creation of new direction in the study of fish osmoregulation and its adaptation to water with different salinity by L.S. Krayushkina and her pupils and colleagues. The mechanisms of regulation of the gametogenesis and the functions of sex gonads, the differentiation of fish sex and the influence of extremal factors on the process of gameto- and gonad genesis in different fishes were investigated by G.M. Persov and his Laboratory of Experimental Ichthyology. The use and the development of the principle of Gerbilsky’s method outside the Department by his pupils were presented: in the creation of the theory of functional basis of fish migrations, in the studies of endocrine regulation of reproductive cycle in acipenserids and salmonids by I.A. Barannikova and colleagues of her Laboratory. Structural and functional peculiarities of hypothalamic-hypophysial neurosecreting system of fishes were studied by A.L. Polenov. The continuation of traditional ruse to the analysis of different fish adaptations were demonstrated in the investigations of the ichthyologists at present time.

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The work presents the biological characteristics of the females of the Amur sturgeon caught in the Amur River: indicators of the length and body weight of females, the mass and stages of maturity of their gonads, the dimensional mass characteristic of oocytes, indicators of individual absolute and relative fertility. The results of histological examination of gonads are presented. Degenerative changes in the structure of the reproductive system were noted, reducing the effectiveness of natural reproduction.