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Spatio-temporal variations in hydro-physical and -chemical parameters during a major upwelling event off the Southern coast of the Gulf of Finland in summer 2006

100%
Suursaar U., Aps R.
Oceanologia
|
2007
|
tom 49
|
nr 2
The objective of the paper is to document and examine the major upwelling event that occurred along the northern coast of Estonia in August 2006. With a horizontal extension of 360 km, the event was caused by persistent easterlies and was noticed by a large number of holidaymakers, as it reduced the temperature of the coastal sea to a chilly 5–10◦C for about a month. In situ measurements from an RDCP current profiler revealed an along-wind coastal jet of up to 60 cm s−1 and a weak near-bottom countercurrent. The depths of the pycnocline and nutricline rose. The maximum drop in water temperature was 16◦C, that of salinity was 3.6 PSU. Analysis of satellite images confirmed the large extension and the prominence of the event.
2

Hydrochemical observations at an anchored station in Ezcurra Inlet

84%
Bojanowski R.
Oceanologia
|
1983
|
tom 15
3

The intensification of pond fish production and the magnitude of the waste load discharged during autumn harvesting

84%
Kolasa-Jaminska B.
Archives of Polish Fisheries
|
2002
|
tom 10
|
nr 2
Carp were cultivated in polyculture with grass carp, silver carp and European catfish. The chemical parameters (pH, oxygen, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, total nitrogen, phosphates, total suspensions, chemical oxygen demand CODMn) of discharged water and four pond layers were measured during the autumn harvest. The study indicated that when the water was discharged the amounts of nitrogen compounds, phosphates and especially total suspension increased from 40 mg dm⁻³ in the first layer to 152 mg dm⁻³ in the last layer and that chemical oxygen demand CODMn increased from 10 mg dm⁻³ in the first layer to 176 mg dm⁻³ in the last layer. The results of both physical and chemical tests on the water discharged from ponds during two periods of the autumn harvest were used to calculate the magnitudes of the loads of organic matter, total suspension and nutrients. The loads of organic matter (expressed as CODMn in an acidic medium), nitrogen, phosphorus and suspensions in the discharged water were determined per ha of area. The highest values were observed in T-type ponds (1,500 specimens ha⁻¹) at an average of 1,214 kg ha⁻¹ and in G3-type ponds (4,000 specimens ha⁻¹ ) with an average of 1,198 kg ha⁻¹ . This data allowed the chemical parameters (kg ha⁻¹) of waters discharged from the ponds in autumn to be compared with the level of CODMn and the amount of nutrients which are introduced to the ponds in spring, as well as to determine the degree of nutrient and organic matter retention in the pond. In the majority of cases nitrogen is fully retained, phosphates are either fully or partially retained and there is an increase in water chemical oxygen demand CODMn especially during the harvest in September.
4

Influence of the date of autumn harvesting on the quality of discharged waters

84%
Kolasa-Jaminska B.
Electronic Journal of Polish Agricultural Universities. Series Fisheries
|
2003
|
tom 06
|
nr 2
The rearing of carp K2-3 in polyculture with a grass- carp, silver carp and European catfish was carried out within 1995- 1997, in six (1995-1996) or in seven (in 1997) variants of ponds differed in stocking densities as well as in kind of feed fed. The objective of the present paper was to verify if the change of harvest date from September into November can affect the quality of discharged waters. Estimation of discharged water quality was made on the basis of following chemical factors: dissolved oxygen, water pH, total suspended matter, chemical oxygen demand CODMn, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen and phosphates. The change of harvest date for 40 days improved markedly the quality of discharged water.
5

Long-term changes in the chemical composition of water in some Tatra lakes

84%
Bombowna M., Wojtan K.
Acta Hydrobiologica
|
1999
|
tom 41
|
nr 1
6

Effects of diversified pond carp culture. 3. Chemical composition of the water in ponds with different carp production

67%
Kolasa-Jaminska B.
Acta Hydrobiologica
|
1995
|
tom 37
|
nr Suppl.1
7

Variability of selected hydrochemical parameters of the 3rd order River Odra estuary in relation to hydrology of the area in 1997-2000

67%
Nedzarek A., Chojnacki J. C.
Electronic Journal of Polish Agricultural Universities. Series Fisheries
|
2003
|
tom 06
|
nr 1
The hydrochemistry of the area.
8

Aquatic fungi growing on feathers of wild and domestic bird species in limnologically different water bodies

59%
Czeczuga B., Godlewska A., Kiziewicz B.
Polish Journal of Environmental Studies
|
2004
|
tom 13
|
nr 1
The mycoflora developing on the feathers of wild and domestic bird species in the water of 6 limnologically different water bodies was investigated under laboratory conditions. 97 zoosporic fungus species were found to grow on the feathers investigated, including 21 Chytridiomycetes, 1 Hyphochytriomycetes, 74 Oomycetes and 1 Zygomycetes fungus. The most common fungus species included Chytriomycetes annulatus, Rhizophydium keratinophilum, Blastocladiopsis parva, Catenaria anguillulae, Catenophlyctis variabilis, Aphanomyces helicoides, Aphanomyces irregularis, Leptolegniella piligena, Pythium afertile, Pythium aquatile, Pythium echinulatum, Pythium intermedium and Pythium tenue. The most fungi were noted growing in water from Cypisek spring (64), the fewest in the ponds Akcent (45) and Fosa (47 species). Out of these 97 species, 17 are known as parasites or necrotrophs of fish. 13 fungus species were recorded for the first time in Poland.
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