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In vitro cultures of aquatic plants

100%
Pozoga M., Kulykovets O., Kukula W., Gunerka L.
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
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2015
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tom 96
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nr 1
2

The structure and the embryogenetic role of eggs and egg membranes of Ancistrus dolichopterus (Actinopterygii: Siluriformes: Loricariidae)

80%
Brysiewicz A., Szulc J., Formicki K., Tanski A., Korzelecka–Orkisz A.
Acta Ichthyologica et Piscatoria
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2011
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tom 41
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nr 3
Background. Bushymouth catfish, Ancistrus dolichopterus Kner, 1854 has raised interest among ornamental fish keepers. Its natural populations are seriously threatened by fishing pressure. The reproduction of this species is difficult to perform (in captivity) and to observe because it occurs at night in shaded areas—most frequently in hiding spots. This study was intended to describe the eggs and their membranes of bushymouth catfish known to provide a parental care during egg development. A special focus of this study was directed towards the microstructure of membranes protecting life cells, and known to be impacted by the environmental conditions the egg morphometric analysis, as well as embryonic development. Materials and methods. The material for the study consisted of the eggs of 3 pairs of bushymouth catfish obtained as a result of their spawning in an aquarium culture. The fertilised eggs were incubated at a constant temperature of 24 ± 0.2°C in water of hardness 17°n, pH 6.5. The utrastructural details of egg membranes were viewed under scanning electron microscope (SEM). Also egg membrane resistance and egg diameters were determined. Images of eggs and newly hatched larvae were measured and analysed. Results. Average egg diameter was 2.98 mm and surface-to-volume ratio (S/V) was 2.01. Internal and external layers of egg membranes showed various structure peculiarities in the surface microstructure of studied eggs.We found that in comparison to other fish the thickness of egg membrane in the bushymouth catfish was high (26.05 μm). External layer had no pores leading to external radial zone (zona radiata externa), however, some specific honeycomb-like formations were visible. The resistance of the egg membrane was 54 ± 1.7 g and the egg mass was 0.017 ± 0.0001 g. The correlation between the resistance and the thickness of the egg membranes was not high, but the correlation between the mass and the resistance was significant. Conclusion. The presently reported study constitutes a contribution to the knowledge of the eggs and embryonic development of bushymouth catfish, and its biological sense, emphasizing the morphophysiological differences between this species—living under, specific, diversified ecological conditions. Such knowledge on early developmental stages may be prove helpful in the fish culturist’s practice of this threatened and interesting species.
3

Application of tests at population and ecosystem levels for the estimation of toxicity of selected non-ionic detergents

80%
Solski A., Erndt E.
Acta Hydrobiologica
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1987
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tom 29
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nr 4
4

Behavioural responses of two popular ornamental carps, Cyprinus carpio L. and Carassius auratus [L.], to monoculture and polyculture conditions in aquaria

80%
Jha P., Jha S., Pal B. C., Barat S.
Acta Ichthyologica et Piscatoria
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2005
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tom 35
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nr 2
Experiments were conducted to document behavioural responses of koi carp, Cyprinus carpio L., and goldfish, Carassius auratus (L.) to monoculture and polyculture conditions in aquaria. Two parallel experiments, otherwise involving similar experimental protocols, were carried out with two batches of fish, fed with live tubifex worm (first batch) and live zooplankton (second batch). Each of the trials, randomized with respect to treatment, yielded data on aggressive encounters (chases, nips), both in presence and absence of food. The two species exhibited considerable variation in the extent and type of aggression displayed, koi carp being the more aggressive species. Frequency of attack increased in the presence of food. The impact of aggressive behaviour of koi carp was conspicuous by the increased level of attack on goldfish in polyculture trials in both experimental batches.
5

Nad fiordem Gullmar

70%
Kielan Z., Pozaryska K.
Wszechświat
|
1957
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nr 02
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