Wyniki wyszukiwania

1

Effects of geomagnetic field deprivation on embryonic development and hatching of Prussian carp (Carassius gibelio)

100%

Tombarkiewicz B., Bojarski B., Olesek A., Pawlak K., Kanik W., Wojnar T., Lis M., Socha M.

Folia Biologica

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2018

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tom 66

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nr 4

2

Duration embryonic development and S-V [surface-volume] coefficient in fish eggs

100%

Bonislawska M., Winnicki A.

Archives of Polish Fisheries

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2000

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tom 08

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nr 2

3

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Correlation analyses of Baltic Sea winter water mass formation and its impact on secondary and tertiary production

100%

Hinrichsen H. H., Lehmann A., Petereit C., Schmidt J.

Oceanologia

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2007

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tom 49

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nr 3

The thermal stratification of the upper water layers in the Baltic Sea varies seasonally in response to the annual cycle of solar heating and wind-induced mixing. In winter,the stratification down to the halocline is almost completely eroded by convection and strong wind mixing. Monthly averaged temperature profiles obtained from the ICES hydrographic database were used to study the long-term variability (1950 to 2005) of winter water mass formation in different deep basins of the Baltic Sea east of the island of Bornholm. Besides strong interannual variability of deep winter water temperatures,the last two decades show a positive trend (increase of 1–1.5◦C). Correlations of winter surface temperatures to temperatures of the winter water body located directly above or within the top of the halocline were strongly positive until the autumn months. Such a close coupling allows sea surface temperatures in winter to be used to forecast the seasonal development of the thermal signature in deeper layers with a high degree of confidence. The most significant impact of winter sea surface temperatures on the thermal signature in this depth range can be assigned to February/March. Stronger solar heating during spring and summer results in thermal stratification of the water column leading to a complete decoupling of surface and deep winter water temperatures. Based on laboratory experiments,temp erature-dependent relationships were utilised to analyse interannual variations of biological processes with special emphasis on the upper trophic levels (e.g.,stage-sp ecific developmental rates of zooplankton and survival rates of fish eggs).

4

Species of Pythium isolated from eggs of fresh-water fish

100%

Czeczuga B.

Acta Mycologica

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1996

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tom 31

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nr 2

5

Effects of copper and cadmium on growth and yolk utilization in barbel [Barbus barbus L.] larvae

80%

Witeska M., Bilska K., Sarnowski P.

Polish Journal of Environmental Studies

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2010

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tom 19

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nr 1

227-230

Barbel eggs and fry were exposed from fertilization until 14 days after hatching to 100 μg/l of copper or cadmium. Cadmium, but not copper, significantly reduced larvae survival. Both metals significantly decreased larval growth. The differences in fish body size between the controls and metal-exposed groups increased in time, and were more pronounced in Cd-intoxicated fish. Copper-exposed larvae started exogenous feeding 1 day later than the control. Cadmium-exposed larvae started feeding 4 days after the controls. Both metals reduced yolk utilization rate. The results demonstrated that cadmium was more toxic to barbel larvae than copper.

6

Effects of alterations in freshwater supply on the abundance and distribution of Engraulis encrasicolus in the Guadiana estuary and adjacent coastal areas of South Portugal

80%

Chicharo L., Chicharo M. A., Esteves E., Andrade J. P., Morais P.

International Journal of Ecohydrology and Hydrobiology

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2001

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tom 01

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nr 3

A reduction of inflow to the Guadiana River on the border between Portugal and Spain may directly contribute to the degradation of fish habitats. Changes are expected to the spawning behaviour of Engraulis encrasicolus adults, to the migration patterns of larvae in the estuary, and to the catches of fisheries in the lower part of the river and adjacent coastal areas. Spawning of E. encrasicolus occurs in the lower part of the estuary and in the adjacent coastal areas. However, high abundances of larvae have been registered in the middle and upper parts of the estuary, the most productive region of the estuary, that with the estuarine turbidity maximum (ETM). In a year of normal inflow, such as the hydrologic year 1987–1988, some retention of larvae occurred in this area. However, in an abnormal hydrologic year with a low inflow (1999–2000), and with an increase in freshwater inflow during the spring months, a disturbance to the migration pattern seems to have affected the survival of larvae in the estuary. High river inflow, probably associated with an increased input of nutrients, appears to have an important and positive effect on adult numbers, because anchovy fishery catches in the adjacent coastal area increased under these conditions.

Ograniczanie wyników

Effects of geomagnetic field deprivation on embryonic development and hatching of Prussian carp (Carassius gibelio)

Duration embryonic development and S-V [surface-volume] coefficient in fish eggs

Correlation analyses of Baltic Sea winter water mass formation and its impact on secondary and tertiary production

Species of Pythium isolated from eggs of fresh-water fish

Effects of copper and cadmium on growth and yolk utilization in barbel [Barbus barbus L.] larvae

Effects of alterations in freshwater supply on the abundance and distribution of Engraulis encrasicolus in the Guadiana estuary and adjacent coastal areas of South Portugal