BIOLOGICAL AND ICHTHYOPATHOLOGICAL CHARACTERISTICS OF THE RUTILUS RUTILUS CASPICUS IN ZHAIYK-CASPIAN BASIN

In the present study, we provide supplementary data for Myxidium cf. rhodei Léger, 1905 based on morphological, histological and molecular characterization. M. cf. rhodei was observed in the kidneys of 918 out of 942 (97%) roach Rutilus rutilus (Linnaeus, 1758). Myxospores of M. cf. rhodei were fusiform with pointed ends, measuring 12.7 ± 0.1 SD (11.8-13.4) µm in length and 4.6 ± 0.1 (3.8-5.4) µm in width. Two similar pear-shaped polar capsules were positioned at either ends of the longitudinal axis of the myxospore: each of these capsules measured 4.0 ± 0.1 (3.1-4.7) µm in length and 2.8 ± 0.1 (2.0-4.0) µm in width. Polar filaments were coiled into 4 to 5 turns. Approximately 18-20 longitudinal straight ridges were observed on the myxospore surface. The suture line was straight and distinctive, running near the middle of the valves. Histologically, the plasmodia of the present species were found in the Bowman’s capsules, and rarely in the interstitium of the host. Phylogenetic analysis revealed that M. cf. rhodei was sister to M. anatidum in the Myxidium clade including most Myxidium species from freshwater hosts.

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Population Characteristics and Feeding of Roach Rutilus rutilus in Small Regulated River of the Kyiv Polissya

Hydrobiological Journal ◽

10.1615/hydrobj.v56.i1.30 ◽

2020 ◽

Vol 56 (1) ◽

pp. 42-48

Author(s):

Ye. A. Gupalo ◽

I. I. Abramyuk ◽

S. A. Afanasyev ◽

O. V. Manturova ◽

Ye. V. Savchenko

Keyword(s):

Rutilus Rutilus ◽

Population Characteristics ◽

Regulated River ◽

Roach Rutilus Rutilus

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TO THE PROBLEM OF PRACTICABILITY OF CHANGING FISHERIES MEASURES FOR COMMERCIAL CATCHES OF ROACH AND SHEATFISHIN THE VOLGA-CASPIAN BASIN (THE ASTRAKHAN REGION)

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2018-1-7-13 ◽

2018 ◽

pp. 7-13

Author(s):

Vitaliy Victorovich Barabanov ◽

Gennadij Grigor'evich Kolosyuk

Keyword(s):

Retrospective Analysis ◽

Caspian Basin ◽

Commercial Catch ◽

Reproductive Part ◽

Fish Catch

Fisheries measures is an instrument allowing to regulate fish catch pressing to the aquatic bio-resources stocks. Roach and sheatfish are the species which are exploited in industrial and amateur fisheries of the Volga-Caspian basin (the Astrakhan region). According to the Fishery Regulations, today the minimum allowable length for roach is 17 centimeters, and for sheatfish it is 60 centimeters. According to the results of retrospective analysis of stocks dynamics, commercial catch of roach and cheatfish, experience in changing fisheries measures for roach and sheatfish in the Volga-Caspian basin, changing fisheries measures for these species has been found inexpedient. The current fisheries measures for commercial catch of roach allows to exploit only the reproductive part of the population, minimizing losses of restocking. Also, the work shows that a change of fisheries measures for sheatfish will lead to the decrease of the commercial catch of sheatfish and objects of its ration. In general, it must be stressed that changing fisheries measures will lead to redistribution of roach and sheatfish catches between the main participants (commercial fishers, amateur fishers and poachers), but not in favor of the official fish catching

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