Wyniki wyszukiwania

1

The effect of lead on photosynthetic apparatus of maize cultivated in aquacultures

100%

Jasiewicz C., Zemanek M., Antonkiewicz J.

Polish Journal of Natural Sciences. Supplement

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2003

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tom 01

2

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Accumulation of manganese in selected links of food chains in aquatic ecosystems

75%

Niemiec M., Wisniowska-Kielian B.

Journal of Elementology

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2015

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tom 20

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nr 4

The accumulation of elements in biocenoses of aquatic ecosystems depends primarily on the forms of elements in the environment. The bioaccumulation coefficient (BC) is a measure of the intensity of an elements uptake of trace by living organisms. Manganese is an essential element for both plant and animal organisms. However, its excess may cause a toxic effect, i.e. it disturbs the activity of synapses, thus leading to an impaired functioning of the central nervous system. This study focused on the accumulation of manganese in individual links of an aquatic ecosystem food chain under conditions of extensive carp farming. The BC values were computed and the pollution degree of the fish pond was estimated. The investigations were conducted in a fish pond situated in Mydlniki and fed with water from the Rudawa River. Water, bottom sediment, benthic organisms (Diptera Chironomidae larvae) and carps were sampled from the pond. Organs most strongly involved in the metal metabolism (gills, gonads, liver and muscles) were prepared from sampled carps. Manganese concentrations were determined in all samples using atomic emission spectroscopy after wet mineralization of samples in a closed system in a microwave mineralizer. The concentrations of manganese in the abiotic elements of pond ecosystems were low and should not pose any threat of its excessive accumulation in living organisms. However, the manganese concentrations in the benthic organisms and in the analyzed carp organs were high. Similarly, other authors found high manganese concentration in fish living in the environments polluted with this element. The value of manganese enrichment coefficient for the bottom sediments in relation to its water concentration was high. The biggest manganese content was assessed in gills, then in the liver and gonads, and the smallest one - in carp muscles. Manganese BCs in the gills of carps in relation to its content in water and bottom sediments were 176.6 and 0.08, respectively. The BC values in relation to the manganese concentration in water were much higher, but lower in comparison to its content in bottom sediments than reported elsewhere. This confirms that the BC for manganese in gills varies depending on the water pollution level.

3

Assessment of a sheltered euhaline area of the Southeastern Bay of Biscay to sustain bivalve production in terms of phytoplankton community composition

75%

Bilbao J., Muniz O., Rodriguez J. G., Revilla M., Laza-Matinez A., Seoane S.

Oceanologia

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2021

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tom 63

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nr 1

4

Scale-dependent environmental control of mesozooplankton community structure in three aquaculture subtropical bays of China

75%

Sun D., Liu Z., Wang C.

Oceanologia

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2016

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tom 58

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nr 2

5

Effects of the polyculture of juvenile stages of Northern pike [Esox lucius L.] and sturgeon in recirculating systems

75%

Szczepkowski M., Szczepkowska B.

Electronic Journal of Polish Agricultural Universities. Series Fisheries

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2006

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tom 09

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nr 1

The possibility of using sturgeon as a stock component during the rearing of pike (Esox lucius L.) fry in tanks was determined. The experiment was conducted in two stages. In the first, pike fry with a body weight of 0.1 g were reared in monoculture and polyculture with a sturgeon component comprising 40 and 80% of the pike biomass. In the second phase, pike fry weighing an average of 3 g were reared in monoculture and polyculture with a sturgeon component comprising 10 and 20% of the pike biomass. The introduction of the sturgeon improved feed utilization and lowered feed conversion ratios from 1.4 to 0.8 in the older pike group (statistically significant difference at P < 0.05). In experiment stage II, the pike fry reared in polyculture with sturgeon attained statistically significant (P < 0.05) higher body growth in comparison with the monoculture variant. Pike survival was the lowest in the monoculture at 72.1 and 91.4% in stages I and II of the experiment, respectively. With regard to the smaller fry, this was due primarily to cannibalism with such losses comprising over 50% of the total losses throughout rearing. Survival in the polycultures was as much as 12% higher. The authors believe that the possibility of rearing these two species together stems from their different behavior and feeding strategy. Another benefit was that the labor-intensive removal of feed not consumed by the pike fry was lowered which meant that there was minimal interference in the tank during rearing.

6

Optimizing conditions for androgenesis induction in koi carp

63%

Kwiatkowski M., Kucharczyk D., Szczerbowski A., Luczynski M. J., Mamcarz A., Jamroz M.

Electronic Journal of Polish Agricultural Universities. Series Fisheries

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2008

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tom 11

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nr 2

7

Alien species of fish parasites in the coastal lakes and lagoons of the Southern Baltic

63%

Morozinska-Gogol J.

Oceanologia

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2009

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tom 51

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nr 1

105-115

Alien species are now found all over the world. New fish parasites have been unintentionally introduced with infected alien fish imported for aquaculture or have sometimes spread with their intermediate invertebrate hosts transported in the ballast waters of ships. Four alien fish parasites have been recorded in Polish coastal lakes and lagoons, all parasitising eels. Three were introduced with the final host – the Japanese eel – introduced for aquaculture (Anguillicola crassus, Pseudodactylogyrus anguillae and Pseudodactylogyrus bini) and one (Paratenuisentis ambiguus) with its sole intermediate host (Gammarus tigrinus).

8

Comparative effects of aquaculture and water level fluctuations on macroinvertebrate communities in Three Gorges Reservoir, China

63%

Chi S., Zheng Z., Zhang Z., Hu J., Zheng J., Zhao X., Hu J., Dong F., Peng J.

Polish Journal of Ecology

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2017

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tom 65

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nr 4

In this study, the comparative effects of the two disturbances (aquaculture and water level fluctuations) on macroinvertebrate communities were explored in two waterbodies connected with the reservoir system of Three Gorges Reservoir (TGR) in China. One water body called Gaoyang Bay which suffered organic pollution from intensive aquaculture. Another named Hanfeng Lake, where the effects of water-level fluctuations are obvious. The results showed that aquaculture could significantly affect the chemical forms of nutrients, decrease the α-diversity and increase the β-diversity of macroinvertebrates although the communities in the treatment area in Gaoyang Bay were not fundamentally changed comparing to the control area in the same bay. The densities of macroinvertebrates in the treatment area were significantly lower than that of the control area. The composition of functional feeding groups in the treatment area was close to that in Hanfeng Lake, but obviously different from that in the control area in Gaoyang Bay and the collectors and predators dominated the communities in this control area with the highest percentages. Although water-level fluctuations had negative effects on the communities by decreasing the α-diversity and increasing the β-diversity, which were confirmed by the values of Simpson index, Shannon-Wiener index and Harrison's index in the control area of Gaoyang bay and Hanfeng Lake, the adverse effects were relative low compared to aquaculture. In the bays of TGR, the small-scale disturbance (aquaculture activities) had more significant negative effects compared to the big-scale disturbance (water-level fluctuations related to dam operation of TGR).

9

Morphometric characteristics of the juvenile North African catfish Clarias gariepinus [Burchell, 1822] from the heated water aquaculture

63%

Wiecaszek B., Krzykawski S., Antoszek A., Kosik J., Serwotka P.

Electronic Journal of Polish Agricultural Universities. Series Fisheries

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2010

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tom 13

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nr 2

10

Variability of biometric characters of Acipenser baerii Brandt, 1869 in the heated water aquaculture

63%

Keszka S., Krzykawski S., Wiecaszek B.

Electronic Journal of Polish Agricultural Universities. Series Fisheries

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2009

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tom 12

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nr 4

11

Gonadal differentiation in Atlantic cod, Gadus morhua L., and haddock, Melanogrammus aeglefinus [L.]

63%

Chiasson M., Benfey T. J., Martin-Robichaud D. J.

Acta Ichthyologica et Piscatoria

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2008

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tom 38

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nr 2

127-133

Background. The purpose of this study was to determine the timing of gonadal differentiation in two gadoids: Atlantic cod, Gadus morhua L., and haddock, Melanogrammus aeglefinus (L.). This information is required to develop a practical protocol for the production of monosex populations of these species for aquaculture. Materials and Methods. Cultured larvae and juveniles were collected weekly, measured (total length; TL), prepared histologically and then examined microscopically for the presence of characteristic stages of gonadal differentiation. Results. In Atlantic cod, undifferentiated gonads were present by 18 mm TL, at 84 days post hatch (dph), and definitive germ cells by 19 mm TL (90 dph). Ovarian cavities were first observed at 27 mm TL (102 dph), and by 35 mm TL (112 dph) anatomical divergence into two types of gonads was clear. In haddock, undifferentiated gonads were observed at 21 mm TL (64 dph) and an ovarian cavity was evident at 29 mm TL (71 dph). Conclusion. Gonadal differentiation in Atlantic cod and haddock occurs at roughly the same size in both species (27 and 29 mm TL, respectively). For successful sex reversal, the administration of steroids should therefore begin at approximately 25 mm TL, shortly after weaning onto dry feed.

12

Evaluation of natural minerals (zeolite and bentonite) for nitrogen compounds adsorption in different water temperatures suitable for aquaculture

63%

Sahin D., Oz M., Sertasi E., Oz U., Karsli Z., Aral O.

International Letters of Natural Sciences

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2018

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tom 71

In this study, it was aimed to determine the effects of zeolite and bentonite on the ammonium adsorption at different temperatures. In this research three trial groups with 3 repetitions were created for three different water temperatures (18±0.1°C, 24±0.0°C, 27±0.0°C). Experimental groups were prepared by adding NH4 + amount of 10.5 mg/l in 2 liters of water. After that, zeolite, zeolite+bentonite and bentonite were added into the bottles as 10 gram per liter. Water temperature, pH and TAN (Total Ammonium Nitrogen) values were determined during the trial period. At the end of trial TAN values at 27 °C were recorded as 10.103±0.11 mg/l, 9.227±0.13 mg/l and 7.933±0.17 mg/l in zeolite, zeolite+bentonite and bentonite groups, respectively. At the end of trial TAN values at 24 °C were recorded as 10.027±0.17 mg/l, 9.282±0.15 mg/l and 8.336±0.15 mg/l in zeolite, zeolite+bentonite and bentonite groups, respectively. At the end of trial TAN values at 18 °C were recorded as 9.012±0.28 mg/l, 7.702±0.14 mg/l and 6.594±0.14 mg/l in zeolite, zeolite+bentonite and bentonite groups, respectively. Maximum ammonium removal capacity, qe, was found to be 0.50 mg/g in the bentonite (18 °C). The TAN values determined at 18 °C were statistically more significant (p<0.05) than the TAN values obtained at 24 °C and 27 °C.

63%

Steffens W.

Polskie Archiwum Hydrobiologii

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1995

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tom 42

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nr 1-2

20

Observation on larval deformity during induced spawning of walking catfish, Clarias batrachus (Actinopterygii: Siluriformes: Clariidae), at different combinations of human chorionic gonadotropin dose and latency period

51%

Sahoo S. K., Giri S. S., Chandra S., Sahu A. K.

Acta Ichthyologica et Piscatoria

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2009

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tom 39

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nr 1

Five combinations of human chorionic gonadotropin (hCG) dose and five latency periods were evaluated to observe the pattern of deformed larvae among the hatchlings in walking catfish, Clarias batrachus (L.). A higher percentage (7%–12%) of deformed larvae were observed at 1000, 2000, and 5000 IU · kg-1 with 14–23 h latency combinations. The results of the study indicated that 3000 IU · kg-1 with 14–23 h and 4000 IU · kg-1 with 14–17 h latency combinations were preferable to reduce the deformed larvae (4%–6%) among the hatchlings during induced spawning of the catfish.

Ograniczanie wyników

The effect of lead on photosynthetic apparatus of maize cultivated in aquacultures

Accumulation of manganese in selected links of food chains in aquatic ecosystems

Assessment of a sheltered euhaline area of the Southeastern Bay of Biscay to sustain bivalve production in terms of phytoplankton community composition

Scale-dependent environmental control of mesozooplankton community structure in three aquaculture subtropical bays of China

Effects of the polyculture of juvenile stages of Northern pike [Esox lucius L.] and sturgeon in recirculating systems

Optimizing conditions for androgenesis induction in koi carp

Alien species of fish parasites in the coastal lakes and lagoons of the Southern Baltic

Comparative effects of aquaculture and water level fluctuations on macroinvertebrate communities in Three Gorges Reservoir, China