Wyniki wyszukiwania

1

The tetraphyllidean and tetrabothriid cercoids from Antarctic bony fishes. II. Occurrence of cercoids in various fish species

100%

Wojciechowska A.

Acta Parasitologica

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1993

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tom 38

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nr 3

The occurrence of eight tetraphyllidean and tetrabothriid cercoids in the alimentary tract of 43 bony fish species (in both adult and larval stages) from three localities, at the South Shetland Islands, South Georgia and the Antarctic convergence line, is reported. Three forms of cercoids with monolocular bothridia (probably Phyllobothrium spp.), as well as a cercoid with undivided bothridia with hook-like projections (probably Dinobothrium sp.), are associated with the pelagic environment. Two forms of cercoids with bilocular bothridia (probably, mainly Pseudanthobothrium spp.), and one form with trilocular bothridia (probably Oncobothrium antarcticum Wojciechowska, 1990), are associated with the benthic zone of fiords and the open sea shelf. Massive infections of predatory fishes with these cercoids were found especially strong in cases of Parachaenichthys spp. (up to 16 thousand cercoids in one host specimen). Cercoids lacking bothridia (probably larval Tetrabothriidae) were found exclusively in a South Georgian fiord. This form is the only one occurring in fish larvae.

2

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Genotoxicity detection with special reference to micronucleation in the erythrocytes of fish species due to water pollution - a mini review

86%

Talapatra S. N., Nandy A.

International Letters of Natural Sciences

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2014

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tom 12

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nr 1

Water pollution is a matter of great concern in lentic and lotic ecosystems. Generally water pollutants like heavy metals, organic compounds, etc. generate from industries and domestic activities. All of these pose serious threat to the fish population in freshwater as well as marine water bodies. An impact caused by water pollutants especially genotoxins depend not only upon its concentration, but also on the duration (acute and chronic exposure) and showed individual and/or combination of pollutants or genotoxins. Genotoxicity of fish with special reference to micronucleus induction in the erythrocytes of fish is an easy screening of water pollution. The present review deals with past and present research works of major water pollutants discharge and their impact on several fish species from available literatures.

3

A new alien fish in the Mediterranean Sea: Champsodon nudivittis (Actinopterygii: Perciformes: Champsodontidae)

86%

Cicek E., Bilecenoglu M.

Acta Ichthyologica et Piscatoria

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2009

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tom 39

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nr 1

A single specimen of nakedband gaper, Champsodon nudivittis (Ogilby, 1895), indigenous to the Indo West Pacific, was captured on 18 January 2008 from the Iskenderun Bay, Turkey. This is the first record of this species in the Mediterranean Sea. The most likely way of introduction would be via ships’ ballast waters.

4

Energetic asymmetry connected with energy flow changes in response to eutrophication: a study of multiple fish species in subtropical shallow lakes

86%

Fu H., Zhang H., He L., Sha Y., Zhao K., He Y., Xu J.

Polish Journal of Ecology

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2019

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tom 67

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nr 4

5

Ergasilus tipurus n. sp. (Copepoda: Ergasilidae), a parasite of Brazilian Amazon fish species

86%

Varella A. M. B., Morey G. A. M., de Oliveira Malta J. C.

Acta Parasitologica

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2019

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tom 64

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nr 1

6

Feeding ecology and reproductive biology of some economically important fish species in the Tono Reservoir, Ghana

86%

Akongyuure D. N.

International Letters of Natural Sciences

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2020

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tom 78

The study of feeding ecology and reproductive biology ensures that the right management measures are applied for best output of fish stocks. Selection of good fish species for culture is also made possible through feeding and reproductive studies. Ghana over-relies on the culture of Nile tilapia and African catfish because there is no reliable scientific information on potential fish species that can be included for fish farming. The current study sought to investigate food habits and reproductive characteristics of economically important fish species in the Tono Reservoir of Northern Ghana. Monthly sampling was carried out from January, 2015 to December, 2016 (24 months). Specimens were obtained using cast net and gillnets of varying mesh sizes. Specimens were immediately transported to the laboratory in a chilled iced chest of temperature 4 ◦ C for morphometric measurements and microscopic analysis of gut content and gonads. Thirty-three (33) individual food items were identified from all the fish species. Phytoplankton was the most important diet (Index of Relative Importance, IRI = 1923) whereas zooplankton was the least important diet (IRI = 35) out of the five major categories of food items identified from all the fish species. The major peaks of gonadosomatic index (GSI) of females were noted in February – March and June – July. Over 80 % variation of fecundity was explained by the predictors (standard length, fish weight and gonad weight) for Clarias gariepinus and Auchenoglanis occidentalis. All the fish species were classified as omnivores and they spawned more than once in a year making all of them good candidates for aquaculture. Management measures should focus on regulating agricultural activities close to the reservoir and fishing activities in the reservoir for sustainable fish production and exploitation.

7

Parasite fauna of asp, Aspius aspius [L.] from Lake Dabie, Northwestern Poland

86%

Hryczynska M., Piasecki W.

Wiadomości Parazytologiczne. Suplement

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2001

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tom 47

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nr 2

8

Restricted-movement paradigm: fish displacements in a small lowland streamlet

86%

Penczak T.

Polish Journal of Ecology

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2006

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tom 54

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nr 1

In a small lowland streamlet (width – 1.7 m, discharge ≤ 0.15 m³ s⁻¹, Central Poland) movements of six fish species were investigated in autumn, on three sampling occasions (2002–2004). The subject of the study were predominantly facultative riverine species (loach Barbatula barbatula (L.), gudgeon Gobio gobio (L.), perch Perca fluviatilis L., roach Rutilus rutilus (L.), giebel Carassius auratus (L.), tench Tinca tinca (L.)). For a few species the calculated median displacements (MD) were close or smaller than the home section lengths (HSL =100 m) with exception of giebel on one sampling occasion. These results were concise with estimated low turnover rate (TR) for the investigated species, which was significantly correlated with MD, and congruent with the Gerking’s restrictedmovement paradigm (RMP).

9

The conservation status of freshwater fishesof the Mura River and its tributaries in the Republic of Slovenia

86%

Povz M.

Polskie Archiwum Hydrobiologii

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1994

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tom 41

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nr 3

10

Ecological and biological aspects of fish assemblage in the Chybayish marsh, Southern Iraq

72%

Mohamed A.-R. M., Hussain N. A., Al-Noor S. S., Mutlak F. M., Al-Sudani I. M., Mojer A. M.

International Journal of Ecohydrology and Hydrobiology

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2012

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tom 12

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nr 1

11

Fish biomass and species composition in the Malta Reservoir, Poland

72%

Andrzejewski W., Szlakowski J., Mastynski J., Mazurkiewicz J., Godlewska M.

Journal of Water and Land Development

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2010

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nr 14

12

Molecular genetic studies on Myxobolus cylindricus and Henneguya mystasi (Myxosporea: Myxobolidae) infecting two Indian fish species, Channa gachua and Mystus vittatus, respectively

72%

Chaudhary A., Gupta A., Goswami U., Cech G., Molnar K., Singh H. S., Szekely C.

Acta Parasitologica

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2019

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tom 64

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nr 1

13

Classifying Vistula and Pomeranian sea trout populations using discriminant functions based on selected scale characters

72%

Borzecka I.

Archives of Polish Fisheries

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2010

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tom 18

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nr 2

14

Two methods of sample preparation for analysis of non-ortho and mono-ortho PCB congeners in the muscles of selected fish species

72%

Witczak A., Chlewinska M.

Acta Ichthyologica et Piscatoria

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2008

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tom 38

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nr 1

Background. Polychlorinated biphenyls (PCBs) are persistent organic pollutants widespread in the environment. Their ability to accumulate in living organisms leads to food contamination, which is the main route of human exposure to PCBs. During analytical procedure of PCB residue determination, losses of these compounds may occur, which contribute to obtaining underestimated analytical results. Adequate analytical method of chlorobiphenyls determination should be applied to avoid the losses and obtain high recoveries and furthermore to enable accurate estimation of the risk of consuming contaminated food. Especially fish, due to the high bioaccumulation, may contain considerable amounts of these compounds. The aim of this study was to determine if the method of sample preparation influences the recovery of non-ortho (PCB 77, 81, 126, 169) and mono-ortho (PCB 105, 114, 156, 157) PCB congeners in selected fish species. Materials and Methods. To prepare samples for chromatographic determination (HP 6890/5973 GC MS) two methods were applied. Fish muscle tissues were dried by rubbing in a mortar with anhydrous sodium sulphate or freeze dried (lyophilised) (LyoLAB 3000). The samples were fortified with a known amount of internal standard (decachlorobiphenyl), and some were additionally fortified with the standard solution of analysed PCB congeners. Results. nternal standard recoveries ranged from 57.61 ± 1.21% to 88.76 ± 4.03% in freeze-dried samples, and from 63.81 ± 5.11% to 97.50 ± 6.14% in samples rubbed with anhydrous sodium sulphate. Following lyophilisation, recoveries of analysed PCB congeners varied from 68.88 ± 11.74% for PCB 157 to 79.18 ± 12.33% for PCB 114. In the samples rubbed with anhydrous sodium sulphate the lowest recovery was determined for PCB 77 (72.40 ± 12.34%), the highest being typical for PCB 156 (83.47 ± 12.86%). Following lyophilisation, toxic equivalents (TEQs) for the examined fish species ranged from 0.0050 ng-TEQ·g-1 dry weight in salmon to 0.0299 ng-TEQ·g-1 dry weight in mackerel. Following rubbing with anhydrous sodium sulphate the highest toxic equivalent (0.0326 ng-TEQ·g-1 dry weight) was calculated for mackerel, and the lowest for salmon (0.0055 ng-TEQ·g-1 dry weight). Conclusion. The research has demonstrated that in most cases the results obtained with both methods have not differed significantly (P < 0.05), although freeze drying resulted in slightly higher losses of PCB congeners. Despite of smaller recoveries, freeze drying can be applied because of solvent saving and easier sample preparation.

15

Zoosporic fungi growing on eggs of Coregonus lavaretus holsatus Thienemann, 1916 from Lake Wdzydze in Kaszuby

72%

Czeczuga B., Kiziewicz B., Godlewska A.

Polish Journal of Environmental Studies

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2004

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tom 13

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nr 4

The authors investigated fungal communities associated with eggs of Coregonus lavaretus holsatus species Lake Wdzydze in Kaszuby. A total of 15 fungus species were found to grow on the studied eggs: Achlya americana, A. oblongata, A. treleaseana, Aphanomyces frigidophilus, A. irregularis, A. parasiticus, Aplanes androgynus, Saprolegnia ferax, S. parasitica, S. salmonis, S. shikotsuensis, Pythium aquatile, P. pulchrum, P. thalassium, and P. torulosum. Worth a special note was the finding of Aphanomyces frigidophilus and Saprolegnia salmonis, new to Polish waters. The results obtained may be important to ichthyopathologists, because 8 of the above-mentioned fungi are known as necrotrophs or parasites of fishes.

16

The MIR-75 net for catching flatfish fry

72%

Kuczynski J.

Bulletin of the Sea Fisheries Institute

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1997

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nr 2

17

The carotenoid content in certain fish species from the fisheries of New Zealand

72%

Czeczuga B., Klyszejko B., Czeczuga-Semeniuk E.

Bulletin of the Sea Fisheries Institute

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2000

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nr 1

18

Chromosome banding patterns of the gudgeon, Gobio gobio [Actinopterygii, Cyprinidae]

72%

Kirtiklis K., Boron A., Porycka K.

Acta Ichthyologica et Piscatoria

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2005

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tom 35

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nr 2

Background. The gudgeon is one of the most divergent fish species in Europe. Morphological variability related to sex, size, ecological characters, and geographical distribution are well documented in the literature. Apart from the only few data on the karyotype, chromosome banding patterns of this species have not been studied. Cytogenetic features are very useful tools in taxonomic descriptions of cyprinid species. The aim of this study was to describe and characterise the banding patterns of the gudgeon karyotype. Materials and Methods. Cytogenetic examinations of 15 specimens of gudgeon from the upper part of the Odra River, Poland, were carried out. Different chromosome banding techniques: Giemsa staining, C-banding, silver nitrate, chromomycin A3 and DAPI staining were used. Results. The karyotype of gudgeon consisted of 2n = 50 chromosomes, and NF = 98 chromosome arms. Ag-NORs were located on one submeta-subtelocentric chromosome pair and the size polymorphism of NORs was detected. The chromosome sites with G-C rich DNA on one submeta-subtelocentric chromosome pair and heterochromatin block in the centromeric regions were found. Low accumulation of A-T pair rich regions were indicated by DAPI staining. Conclusion. The presently described new chromosomal features of Gobio gobio substantially enhance our knowledge on the taxonomy of this species at cytogenetic level. Jointly with data on morphological- and genetic variability they could be used to determine the phylogeny of the genus Gobio and related species.

19

Genetic diversity of the invading fish species Neogobius melanostomus [Pallas, 1811] [Gobiidae: Perciformes] from the Baltic Sea

72%

Szybkowska J.

Annales Zoologici

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2003

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tom 53

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nr 2

The genetic diversity of Neogobius melanostomus populations was investigated by means of allozyme electrophoresis. 28 loci coding for 16 enzyme systems were examined. Samples originated from the Gulf of Gdańsk (Baltic Sea, newly founded population) and the north part of the Black Sea, off the Crimean Peninsula (centre of range). Despite their considerable geographical isolation, the genetic distance was not high (DNₑᵢ = 0.0353), also the populations had shown great similarity at the polymorphism level and the mean number of alleles per locus. High level of polymorphism and no signs of the founder effect in the Baltic Sea population could indicate that colonisation was very intensive.

20

The effect of constant incubation temperature on the number of vertebrate in the tench Tinca tinca [L.] roach Rutilus rutilus [L.] and perch Perca fluviatilis L.

72%

Kokurewicz B., Witkowski A.

Zoologica Poloniae

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1993

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tom 38

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nr 1-4

Ograniczanie wyników

The tetraphyllidean and tetrabothriid cercoids from Antarctic bony fishes. II. Occurrence of cercoids in various fish species