scholarly journals Time-based method for determining fish abundance in fishing rivers

2020 ◽  
Vol 0 (1) ◽  
pp. 68-76
Author(s):  
Evgeniy Vyacheslavovich Kulikov ◽  
Erbolat Latifovic Kadimov ◽  
Kuanysh Baibulatovich Isbekov ◽  
Saule Zhangirovna Asylbekova
Keyword(s):  
Fish Species ◽  
Crucian Carp ◽  
Statistical Data ◽  
Fish Abundance ◽  
Water Bodies ◽  
Anadromous Fish ◽  
Commercial Fish ◽  
Fish Stocks ◽  
Rational Use ◽  
Entire Duration

The article touches upon the problem of the rational use of fish stocks in fishing water bodies, which implies using modern accounting methods for fish abundance and fish stocks. To this end, instrumental surveys are carried out. In the fishing rivers of Kazakhstan (the Zhayik and Kigash Rivers) there was previously used the biostatistical method of accounting based on data from fishing statistics. The statistical data have recently become unreliable, since they do not take into account the illegal, unregulated and unreported catch. Instead of the biostatistical method, it has been proposed to use the time-based method which considers the fish that have passed along the river for a certain period of time and extrapolating these data for the entire duration of the fish run. The results of using the method to estimate the abundance of semi-anadromous fish species in the Zhaiyk River in the spring of 2019 are shown. There has been developed the method determining the catchability of a commercial seine on the river by conducting simultaneous fishing with two seines following one after another. For each fish species in the catch, the catch coefficient should be calculated separately. Examples of calculating the abundance, ichthyomass, and commercial stocks of various fish species (roach, sazan, bream, asp, crucian carp, sabrefish, catfish) that entered the river in the spring of 2019 are presented. There is found a difference in the values of the commercial fish stocks determined by the time-based and biostatistical methods, due to the lack of the subjective component of the forecast.

scholarly journals Fatty Acid Composition and Contents of Seven Commercial Fish Species of Genus Coregonus from Russian Subarctic Water Bodies

Lipids ◽  
2017 ◽  
Vol 52 (12) ◽  
pp. 1033-1044 ◽  
Author(s):  
Michail I. Gladyshev ◽  
Nadezhda N. Sushchik ◽  
Olesia N. Makhutova ◽  
Larisa A. Glushchenko ◽  
Anastasia E. Rudchenko ◽  
...  
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Fish Species ◽  
Water Bodies ◽  
Commercial Fish

scholarly journals МОРФОМЕТРИЧНІ ПОКАЗНИКИ ДЕЯКИХ ВИДІВ РИБ МАЛИХ РІЧОК ЗАХІДНОГО ПОДІЛЛЯ ЯК ІНДИКАТОР ЗАБРУДНЕННЯ ВОДОЙМ

2020 ◽  
Vol 78 (4) ◽  
pp. 35-40
Author(s):  
V. O. Khomenchuk ◽  
B. Z. Lyavrin ◽  
V. Z. Kurant
Keyword(s):  
Fish Species ◽  
Crucian Carp ◽  
Body Height ◽  
Perca Fluviatilis ◽  
Small Rivers ◽  
Trophic Conditions ◽  
Commercial Fish ◽  
Average Mass ◽  
Perch Perca Fluviatilis ◽  
Head Height

The morphometric characteristics of the most common commercial fish were studied: carp – Cyprinus carpio L., pike – Esox lucius L., crucian carp– Carassius auratus gibelio Bloch. and perch – Perca fluviatilis L., two years old, with an average mass of 290–330 g., 300–350 g., 150–230 g. and 170–230 g. respectively, caught from the small rivers of the Western Podillia (Strypa, Seret, Zolota Lypa). It was found, that the indicators of full length, standard length, head length, head height at the back of the head, the largest and smallest body height in carp, crucian carp and perch decreased linearly in a number of rivers Strypa – Seret – Zolota Lypa. It is noted, that the values of the liver index in the investigated fish species differ significantly from the representatives of the rivers Seret and Zolota Lypa compared to the species from the Strip River. This indicator increases in the Strypa – Seret – Zolota Lypa range, except for the pike index, which is of the lowest importance in the representatives of the Seret River. All the fish species studied saw an increase in the gills index in a number of Strypa – Seret – Zolota Lypa rivers. The study demonstrated that the values of the Fulton and Clark fattening coefficients in carp, crucian carp and perch decreased in a number of Strypa – Seret – Zolota Lypa rivers. In pike the highest values of fattening coefficients were noted for fish from the river Seret. Considering the same age of the fish and relatively the same trophic conditions in the studied rivers, it can be assumed, that the differences in morphometric indices are due to different anthropogenic influence on the watercourses. In this case, the least favorable environmental conditions are in the Zolota Lypa river, which is obviously due to its complex pollution.

scholarly journals Indicator-based status assessment of commercial fish species in the North Sea according to the EU Marine Strategy Framework Directive (MSFD)

2013 ◽  
Vol 70 (3) ◽  
pp. 694-706 ◽  
Author(s):  
Wolfgang Nikolaus Probst ◽  
Matthias Kloppmann ◽  
Gerd Kraus
Keyword(s):  
North Sea ◽  
Fish Species ◽  
Marine Strategy Framework Directive ◽  
Commercial Fish ◽  
Fish Stocks ◽  
The North ◽  
The Status ◽  
Status Assessment ◽  
The North Sea ◽  
The Eu

Abstract Probst, W. N., Kloppmann, M., and Kraus, G. Indicator-based status assessment of commercial fish species in the North Sea according to the EU Marine Strategy Framework Directive (MSFD). – ICES Journal of Marine Science, 70: 694–706. The EU Marine Strategy Framework Directive (MSFD) is structured into eleven descriptors of good environmental status (GES). For each descriptor the current status of the marine environment should be assessed against its GES using ecosystem criteria and indicators. Within Descriptor 3 (D3) the MSFD addresses the status of exploited fish stocks according to three criteria (exploitation rate, stock size and size structure). This study performed an MSFD-compliant assessment of exploited fish stocks in the North Sea by aggregating data from analytical stock assessments and scientific research surveys to calculate indicator metrics for each criterion within each stock time-series. A stock achieved GES, when each indicator for each criterion had a good status. Of 43 assessed fish stock suggested by the EU Data Collection Framework, 63% (27) achieved GES. Though the MSFD explicitly demands that all exploited fish stocks achieve GES, this demand may be challenged by reality, because the status of exploited stocks depends not only on fishing impacts, but also on environmental conditions and ecological interactions. Therefore an alternative approach based on binomial distributions is presented to define limits for GES at the descriptor level. The implications and pitfalls of the applied assessment methods are discussed.

scholarly journals Angling for data: Recreational anglers’ records of conger eel (Conger conger) landings from the English Channel between 1990-1991

2016 ◽  
Author(s):  
Magnus L Johnson ◽  
Philip Wheeler
Keyword(s):  
Fish Species ◽  
Quantitative Data ◽  
Population Trends ◽  
Retrospective Data ◽  
English Channel ◽  
Commercial Fish ◽  
Fish Stocks ◽  
Government Records ◽  
Conger Eel ◽  
Conger Conger

Declines in commercial fish stocks have been well documented through government records of catches. Here we demonstrate that records from anglers, if appropriately interpreted, can be used to provide detailed retrospective data on population trends in fish species. We highlight this with reference to records of conger eel from the British Conger Club that show a decline in size and abundance of conger through the 1990s, during which time the commercial extraction of the species increased markedly. Anglers’ records are a potentially important source of quantitative data on population trends of a number of poorly studied species.

scholarly journals STUDY OF UKRAINIAN AND WORLD EXPERIENCE IN THE FIELD OF WATER BODIES' CRIMINAL LAW PROTECTION

2020 ◽  
Vol 36 (3) ◽  
pp. 19-27
Author(s):  
A. Shulha ◽  
V. Pavlykivskyi ◽  
S. Vambol ◽  
V. Vambol
Keyword(s):  
Water Resources ◽  
Criminal Law ◽  
Natural Waters ◽  
Statistical Data ◽  
Legal Protection ◽  
Water Bodies ◽  
Toxic Substances ◽  
Rational Use ◽  
Environmental Objects ◽  
Criminal Offenses

The this work purpose is to study present Ukrainian and world experience in the criminal law protection field of water bodies in order to develop recommendations for improving the ways of their protection and rational use. For the analysis of Ukrainian and world norms and laws, an overview and analytical approach was used. The databases Google Scholar, PubMed, ResearchGate were searched for relevant keywords. Methods of mathematical statistical data processing are used to study criminal offenses against water resources on the example of Ukraine and to forecasting them. The rules for collecting wastewater into sewerage systems operating in Ukraine are not strict enough and do not establish clear restrictions for the discharge of wastewater containing active pharmaceutical ingredients. To achieve the result specified in the rules, it is enough to use ineffective cleaning methods. Along with the classical methods of protecting water bodies from contamination by toxic substances, such as environmental engineering, legal mechanisms should be applied to prevent offenses related to water resources. A special place is occupied by the criminal-legal impact on persons guilty of causing harm to environmental objects. However, in Ukraine there is a persistent negative trend regarding the protection of natural waters. The forecast showed that the number of recorded crimes against the environment continues to grow (by at least 4.3 %), and against water resources – by almost a quarter a year (21.8 %). So in Ukraine, legal protection in general and criminal law, in particular, is weak protection against the commission of criminal offenses against the country's water resources by potential offenders. The study of criminal offenses against water resources and their forecasting was carried out on the example of Ukraine, therefore it is recommended to study these issues for other countries of different levels of development. The originality and significance of the study lies in the generalization and analysis of statistical data on criminal offenses against the environment in general, and water bodies in particular, as well as in predicting criminal offenses for the next three years. The study made it possible to identify weaknesses in the legislative and criminal law protection of water bodies in Ukraine, which should become the beginning for improving the ways of their protection and rational use.

scholarly journals SPECIES COMPOSITION OF COMMERCIAL FISH CATCHES IN WATER BODIES OF THE STAVROPOL TERRITORY FOR THE PERIOD OF THE LATE XX – EARLY XXI CENTURIES

2019 ◽  
Vol 14 (1) ◽  
pp. 169-177 ◽  
Author(s):  
E. G. Mishvelov ◽  
I. A. Bakumenko
Keyword(s):  
Species Composition ◽  
Common Carp ◽  
Crucian Carp ◽  
Silver Carp ◽  
Water Bodies ◽  
Landsat 8 ◽  
Silver Crucian Carp ◽  
Commercial Fish ◽  
The Past ◽  
State Water

Aim. The aim of the study is to analyze the species composition of commercial fish catches in water bodies of the Stavropol Territory for two periods from 1986 to the present.Methods. The first period from 1986 to 2003 is conventionally highlighted and the second period from 2009 to 2017. Data on linear and area characteristics of the territorial objects was obtained using Landsat 8 satellite imagery.Results. In 2017, in the fish industry of the Stavropol Territory, 10.8 thousand tons of marketable fish were produced, which was about 70% of the best production level in 1990. The share of common carp production was 58%, silver carp – 34%, white Amur – 5% , other carp fish species – 3%, trout and sturgeon – 1%. In 2017, 1415 tons of fish seeds were produced bringing the total to 19 million units, which is 4 times less than in 1990. The importance of fish catching in providing the population of the region with fish is not so great in comparison with fish farming. In different periods of the last thirty years, the total annual catch in regional state water bodies (reservoirs) ranged from a maximum of 1065 tons (1990) to a minimum of 82 tons (2016). The average annual catch in all state water bodies for the period 1986 – 2003 amounted to 357 tons; fish productivity was 32 kg, with fluctuations from 2 to 113 kg/ha in eleven water bodies. Over the past 9 years, since 2009, the average annual catch in all state water bodies has decreased and amounted to 285 tons.Conclusion. For the period of 1986-2003, the average annual catch of common carp and silver crucian carp was 94 tons each and 79 tons of silver carp; the total share of these three species in catches was 85%. Over the past 9 years (2009-2017), the total share of these fish in the catches has decreased to 66%. The average annual catch of common carp and silver carps was almost halved, while the catch of less valuable silver crucian carp increased and reached 103 tons.

scholarly journals Angling for data: Recreational anglers’ records of conger eel (Conger conger) landings from the English Channel between 1990-1991

2016 ◽  
Author(s):  
Magnus L Johnson ◽  
Philip Wheeler
Keyword(s):  
Fish Species ◽  
Quantitative Data ◽  
Population Trends ◽  
Retrospective Data ◽  
English Channel ◽  
Commercial Fish ◽  
Fish Stocks ◽  
Government Records ◽  
Conger Eel ◽  
Conger Conger

Declines in commercial fish stocks have been well documented through government records of catches. Here we demonstrate that records from anglers, if appropriately interpreted, can be used to provide detailed retrospective data on population trends in fish species. We highlight this with reference to records of conger eel from the British Conger Club that show a decline in size and abundance of conger through the 1990s, during which time the commercial extraction of the species increased markedly. Anglers’ records are a potentially important source of quantitative data on population trends of a number of poorly studied species.

scholarly journals Assessing the Inter-Relations Between Fish Health and Stock Status of the Main Commercial Fish Species

2018 ◽  
Vol 1 (1) ◽  
pp. 168-175
Author(s):  
Aurelia Totoiu ◽  
Neculai Patriche
Keyword(s):  
Health Status ◽  
Fish Species ◽  
The State ◽  
Point Of View ◽  
Fish Populations ◽  
Parasitic Diseases ◽  
Fish Health ◽  
Commercial Fish ◽  
Fish Stocks ◽  
Stock Status

Abstract This paper aims to show the importance of knowing the health status of fish populations in their natural environment and its influence on fish stocks at the Romanian coast. To assess the interrelationship between fish health status and the state of stocks, the following fish species: turbot, sprat, anchovies and horse mackerel were analysed from the pathological point of view. Pathological analyses performed between 2015 and 2017 revealed the presence of infections caused by bacteria of the genus Aeromonas and Vibrio and parasitic diseases Trichodinosis, Botriocephalosis and Nematodosis. The presence of these diseases in natural fish populations may represent a real danger to the state of existing stocks, but also to their evolution.

scholarly journals The Value of Habitat Complexity and Diversity of Reef Fish Species in Sangiang Island, Bima Regency, West Nusa Tenggra

2020 ◽  
Vol 20 (3) ◽  
pp. 514
Author(s):  
Rahmat Hidayatullah ◽  
Didik Santoso ◽  
Abdul Syukur
Keyword(s):  
Coral Reef ◽  
Reef Fish ◽  
Fish Species ◽  
Coral Reef Fish ◽  
Habitat Complexity ◽  
Fish Abundance ◽  
Coefficient Of Determination ◽  
Fish Diversity ◽  
Commercial Fish ◽  
Average Value

Coral reef ecosystems in the marine environment have a vital role, especially in providing habitat for the diversity of commercial and non-commercial fish species. This study aims to assess the species richness of coral reef fish based on the complexity of the habitat of Sangiang Island, Bima Regency. The data collection method used Underwater Visual Census on the belt transect, and the habitat complexity value is determined by the chain intercept transect method. Data analysis used Shannon-Wiener Index Diversity (H '), Abundance (Ki), and Habitat complexity (C). Next is a simple regression analysis between habitat complexity as the independent variable and fish abundance as the dependent variable. In this study, 106 species were found and covering 24 families. The three fish families, Pomacentridae, Labridae, and Lutjanidae, are the most dominant of the other families. Meanwhile, the diversity index ranged from 1.874-2.753 with an average value of ± SD 2.35 ± 0.317, and the abundance value ranged from 0.774-2.528 individuals/m2 with an average value of ± SD 1.505 individuals / m2 ± 0.745. Furthermore, the analysis showed that hábitate complexity had a significant effect on fish abundance. The coefficient of determination (R2) of 80% can explain the relationship of habitat complexity to fish abundance in the study location. This study concludes that coral reef habitat complexity is a determining factor for the level of fish diversity and abundance in the study area. Therefore, the protection of coral habitat is a strategy for the protection of coral reef fish resources.

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