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1
Content available Day/night effects of passing boat on fish distribution in the shallow Malta reservoir
100%
Godlewska M. , Długoszewski B. , Doroszczyk L.
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2009
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tom Vol. 12
61-68
EN
Hydroacoustical measurements of fish population in the shallow Malta reservoir (mean depth <3 m) were performed in September and October 2008 using mobile horizontal beam. During the different time of day and night the same transects were covered in two directions, from the dam towards the upper part of the reservoir and back. During the day the number of fish registered on the returned way was lower than on the way forward in 83% of cases, and during the night in 67% of cases, however these differences were not statistically significant. Observation of fish at different distances from the boat have shown small avoidance reaction, especially for the small fish, that was similar during the day and at night, thus suggesting that mainly noise was responsible for the fish avoidance. Nevertheless, in shallow waters boat avoidance by fishes is of much less importance than in marine environment.
2
Content available remote DNA barcoding of commercially important marine fish species Hipposcarus harid from the central Red Sea, Saudi Arabia
88%
Solami L. A.
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2024
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tom Vol. 53, No. 2
111--119
EN
In this study, the collected fish species were identified based on morphological observations and then evaluated by DNA barcoding. The COI gene has been recognized as a biological marker for fish species identification and the objective of this study is to analyze the variable region of the COI gene in subunit I. The mitochondrial cytochrome (COI) oxidase subunit I gene was analyzed as a suitable molecular maker for the identification of three specimens of the fish species Hipposcarus harid, widely distributed in the Red Sea. The COI gene sequences in the variable region revealed variations among the fish species. The COI gene sequences in the variable region were similar to the variable region of Hipposcarus harid collected from the Northern Red Sea and all three were named: H. harid H13, H. harid H2c, and H. harid H12. The identification of the fish species collected from the Red Sea in Saudi Arabia would help ichthyologists improve the management, conservation and monitoring of economically important long-nose parrotfish species in Saudi Arabia.
3
Content available The use of the indicator parasite Anisakis simplex in population surveys of Pacific harring Clupea pallasii (Clupeiformes: Clupeidae) in Sakhalin water
75%
Rybnikova I. G. , Pushnikova G. M. , Matrosova I. V.
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
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2018
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tom 22
EN
Quantitative indices of herring infestation in Sakhalin waters reveal a high infection rate of fish in the basin of the Sea of Okhotsk, off the east coast of the island. Moreover, in certain years almost 100% of herring were infested. The so-called local populations as well as widely migrating Sakhalin Hokkaido herring are confined to the area of this waterbody. In the basin of the Sea of Japan, off the west coast of Sakhalin, the indicator values of herring infestation are much lower. The local population as well as widely migrating herring of Sakhalin Hokkaido population are confined to this marine area. The causality analysis of herring infestation in these areas allows to confirm our earlier conclusions about population structure of herring inhabiting the waters around Sakhalin Island.
PL
Ilościowe wskaźniki skażenia śledzia pacyficznego w wodach Sachalinu wskazują na wysokie zanieczyszczenie ryb w dorzeczu Morza Ochockiego, u wschodniego wybrzeża wyspy. Co więcej, w niektórych latach śledź został zainfekowany prawie w 100%. Lokalne populacje śledzia, a także szeroko migrująca Sachalińsko-Hokkaidowska populacja śledzia są ograniczone do obszaru wodnego tego zbiornika. W basenie Morza Japońskiego, u zachodniego wybrzeża Sachalinu, wartości wskaźników zainfekowania śledzia są znacznie niższe. Podobnie lokalne i szeroko migrująca Sachalińsko-Hokkaidowska populacje śledzia są również ograniczone do tego obszaru wodnego. Analiza związków przyczynowo-skutkowych zainfekowania śledzi w tych obszarach pozwala potwierdzić uzyskane wcześniej wyniki dotyczące struktury populacji śledzi wód otaczających wyspę Sachalin.
4
Fish stocks in the Warta River: Continued post-impoundment study [ 1990-1992 ]
75%
Penczak T. , Galicka W. , Glowacki L. , Koszalinski H.
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nr 3
5
Cormorant [Phalacrocorax carbo] predation on fish populations in rivers of the Czech Republic
75%
Spurny P. , Mares J.
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2000
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tom 27
6
Model development for the determination of Final preferenda in freshwater species. Application in tench Tinca tinca [L.]
75%
Perez-Regadera J. J. , Gallardo J. M. , Garcia Ceballos E. , Escudero Garcia J. C.
Polskie Archiwum Hydrobiologii
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1995
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tom 42
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nr 1-2
7
Effects of acidification on lake whitefish [ Coregonus clupeaformis ]
75%
Mills K. H. , Chalanchuk S. M. , Allan D. J.
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nr 3-4
8
Fish stocks in rivers of Bulgaria
75%
Dikov T. , Jankov J. , Jocev S.
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nr 3
9
Density and biomass of fish in the Rożnów Reservoir (Southern Poland)
63%
Jelonek M. , Amirowicz A.
Acta Hydrobiologica
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1987
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tom 29
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nr 2
10
A comparative analysis of food components in fish populations from the Buzau River basin (Romania)
63%
Ureche D. , Nicoara M. , Ureche C.
Oceanological and Hydrobiological Studies
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2008
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tom 37
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nr Suppl.1
11
Content available Assessment of genetic variability in common whitefish from the catchment area of the Oder river using microsatellite markers
63%
Archem M. , Skuza L. , Kirczuk L. , Domagala J. , Pilecka-Rapacz M. , Czerniawski R.
Acta Biologica
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2017
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tom 24
12
Status of recruitment studies of Northeast Pacific fishes
63%
Kendall A. W.
Bulletin of the Sea Fisheries Institute
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2000
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nr 3
13
Consequences of the basin morphology for fish community in a deep-storage submontane reservoir
63%
Amirowicz A.
Acta Hydrobiologica
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1997
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tom 39
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nr Suppl.1
14
A preliminary evaluation of the effect of human activity on the fish populations of the Pilica river, Central Poland
63%
Penczak T. , Mann R. H. K.
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tom 40
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nr 1
15
The comparison of Baltic herring and sprat age-length keys derived from Polish commercial and research data
63%
Horbowy J.
Bulletin of the Sea Fisheries Institute
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1999
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nr 2
16
The importance of floodplains for the dynamics of fish communities of the upper river Parana
51%
Agostinho A. A. , Gomes L. C. , Zalewski M.
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nr 1-2
EN
The last free stretch of the River Paraná inside of Brazilian territory, about 230 km of the former 810 km, runs in a wide floodplain, which flood regime is controlled in part by upstream dams. Aim to evaluate the impacts of different levels of hydrological control on the regional fish diversity, nutritional condition, trophic categories proportion, reproduction and young abundance monthly sampling were carried, between 1986 and 1993, during three annual periods with different flood duration and intensity. Lagoons, secondary channels and river channel was sampled with gillnet of different mesh size and standardized effort. Diversity, evenness indexes and number of species increased with the occurrence of floods. The trophic category proportions varied among the periods considered, with a decrease in piscivores participation and an increase of iliophages, herbivores and insectivores (terrestrial) participation in big flood years. The tendencies for piscivores guild were not uniform to every pecies. The variations on the nutritional condition reveal that the absence of flooding has a negative effect on greater migratory species and positive on sedentary ones. The young abundance shows, however, that fail in the flooding has a strong negative impact on de recruitment of all the reproductive strategies. It’s stressed the operational procedures in the upstream dams and the maintenance of the floodplain integrity is essential to preserve the regional biodiversity, fisheries and particularly the greater migratory fishes population.
17
Some considerations of the effects of differences in flood patterns on fish populations
51%
Welcomme R. , Halls A.
International Journal of Ecohydrology and Hydrobiology
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2001
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tom 01
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nr 3
EN
Fish are heavily influenced by the nature of the flood regimes of the rivers in which they live. These fluctuate naturally from year to year but recently increasing pressure on water for a wide range of uses other than fisheries has led to human activities that have substantially altered the flood regimes of many rivers throughout the world. This has resulted in the loss of fish production and biodiversity. There are now efforts to mitigate for these changes that include release of artificial floods from dams or polder sluices. The typical flood curve contains several characteristics that may influence the survival and growth of the individual fish species. Understanding of these characteristics will help design appropriate flood curves and maximize benefits from the water available.
18
Diet and feeding of dominant fish populations in the impounded Warta River, Poland
51%
Marszal L. , Grzybkowska M. , Penczak T. , Galicka W.
Polskie Archiwum Hydrobiologii
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1996
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tom 43
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nr 2
19
The ichthyofauna of the Lavezzi Islands [Corsica, France] at depths between 0 and 1 m: inventory, quantitative evaluation and recolonisation after experimental destruction
44%
Bouchereau J. L. , Hoai T. L.
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nr 2-3
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