Search academic texts

Registration Number

0217U003645, 0117U004075 , R & D reports

Title

The study of the structure of the Neogobius melanostomus population in the Azov Sea

popup.stage_title

Head

Demchenko Viktor O.,

Registration Date

13-06-2017

Organization

Institute of Marine Biology National Academy of Sciences of Ukraine

popup.description2

Research report: 27, 18 Figure 4 Table 13 sources.... The object of study - the population structure of the Neogobius melanostomus in the Azov Sea. Purpose - to clarify the size-mass, age and sex structure of the populationNeogobius melanostomus in the Azov Sea. Research Methods - field observations, the standard ichthyological methods, a comprehensive statistical analysis. The results and their novelty. Investigated Neogobius melanostomus population structure in the Azov Sea. Based on the comparison the results of other studies, we recorded a significant reduction in the average size of individuals. In еру goby dredge catches. for the entire study period. registered male individuals with an average size of 10.6 cm and a average weight of 22.0 g, while females had a significantly smaller size, 9.2 cm and 13.2 g. In result of research was found 4 age goby groups in the catches dredge, but in different months of research their relationship had some differences. For sex structure bull logs indicated a certain stability, which is close to the ratio of males and females at the level of 1 to 1. At the same time there are certain seasonal fluctuations due to natural mortality and spawning males. Reduction of medium-sized bull logs may have a number of negative consequences, namely: - reduction of medium size, and thus the ratio of age groups, will lead to a decrease in interest nerestuschihsya individuals. This, in turn, will lead to a rapid decrease in the number; - small size of individuals contribute to the reduction of catch for one commercial gain. It requires a more marked for achievement of the planned volume of commercial extraction. In connection with the specifics of fishing gear, this leads to an almost total destruction of benthic biocenoses. Significant growth of official commercial catches, on the background of significant volumes of IUU fishing can lead to the destruction of the goby fish population abundance . Keywords: round goby fish, the population structure, Azov Sea, fishing, IUU fishing.

Product Description

popup.authors

Демченко В.О.
Ткаченко М.Ю.

popup.nrat_date

2020-04-02