Natural conditions for the reconstruction of fish ponds and possibilities of their use in ecotourism

Natural conditions for the reconstruction of fish ponds and possibilities of their use in ecotourism The paper comprises an analysis of the environmental impact of restoring small water retention in the Świergotka River. Hampering water flow due to river damming by 0.5 m and reconstruction of ponds will have a favourable effect on the valley's nature but may result in excessive water eutrophication in case of using these reservoirs for fish-farming.

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Fish farming in Denmark: environmental impact of regulative legislation

Water Science & Technology ◽

10.2166/wst.1995.0365 ◽

1995 ◽

Vol 31 (10) ◽

pp. 73-84 ◽

Cited By ~ 3

Author(s):

T. M. Iversen

Keyword(s):

Organic Matter ◽

Environmental Impact ◽

Freshwater Fish ◽

Aquatic Environment ◽

Action Plan ◽

Fish Farming ◽

Fish Farms ◽

Nitrogen And Phosphorus ◽

Local Impact ◽

The Impact

The main environmental problems associated with fish farming in Denmark are attributable to the dam, the “dead reach” and nutrient and organic matter discharge. The environmental regulation of fish farming in Denmark started with the Environmental Protection Act of 1974, the Statutory Order of 1985 forbidding wet feed, and the Action Plan on the Aquatic Environment of 1987. In the case of freshwater fish farms, the latter was implemented through the measures stipulated in the 1989 Statutory Order on Fish Farms. The impact of Danish legislative measures to reduce and regulate the environmental effects of freshwater fish farms can be summarized as follows: - the number of fish farms has been reduced from about 800 in 1974 to about 500 at present; - production has tripled since 1974 and has been stable since 1989; - a change from wet to dry feed has reduced the environmental impact of the farms; - the national goals of the Action Plan on the Aquatic Environment of 1987 for reducing fish farm discharges of organic matter, nitrogen and phosphorus have been fulfilled. The main remaining problems are that: - the local impact of fish farms on downstream stream quality is still much too high in about 15% of cases; - the problem of the passage of migrating invertebrates and fish is still unsolved at some farms; - the problems posed by “dead reaches” are still unsolved. It is concluded that sustainable fish farming is possible in Denmark, but with the present technology production will have to be significantly reduced.

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Effect of particle size of blueberry pomace powder on its properties

Proceedings of 21th International Drying Symposium ◽

10.4995/ids2018.2018.7879 ◽

2018 ◽

Author(s):

Noelia Betoret ◽

Laura Calabuig-Jiménez ◽

Cristina Barrera ◽

Lucia Seguí

Keyword(s):

Particle Size ◽

Environmental Impact ◽

Water Retention ◽

Storage Time ◽

Antioxidant Properties ◽

Fibre Content ◽

Total Phenols ◽

Emulsifying Properties ◽

Effect Of Particle Size ◽

Emulsifying Capacity

Producing dried powders from blueberry pomace allows to reduce its environmental impact and gives value to this waste material. This work aims to evaluate the effect of particle size (fine or coarse) of blueberry pomace dried at 70 ºC on its fibre content and main physicochemical properties, including antiradical capacity, total phenols and anthocyanins content, hydration and emulsifying properties. The effect of storage on antioxidant properties was also evaluated. Results showed a significant effect of particle size on fibre content and consequently, on water retention, holding and emulsifying capacity of the powder. Neither phenols nor anthocyanins were affected by particle size or storage time. Keywords: blueberry pomace, powders, fibre, antioxidant properties.

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Effect of small water retention structures on diffusive CO2 and CH4 emissions along a highly impounded river

Inland Waters ◽

10.1080/20442041.2018.1457846 ◽

2018 ◽

Vol 8 (4) ◽

pp. 449-460 ◽

Cited By ~ 2

Author(s):

Lluís Gómez-Gener ◽

Marina Gubau ◽

Daniel von Schiller ◽

Rafael Marcé ◽

Biel Obrador

Keyword(s):

Water Retention ◽

Ch4 Emissions ◽

Small Water ◽

Retention Structures

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Results of experimental work on the application of the aquacrop rotation practice in fish ponds in Iraq

Rybovodstvo i rybnoe hozjajstvo (Fish Breeding and Fisheries) ◽

10.33920/sel-09-2106-05 ◽

2021 ◽

pp. 56-67

Author(s):

Farhan Yasin Hamed Farhan Yasin Hamed ◽

Lydia Mikhailovna Vasilyeva ◽

Natalia Viktorovna Sudakova ◽

Ali Attala Muheisin ◽

Adelia Zakirovna Anokhina

Keyword(s):

Crop Rotation ◽

Production Efficiency ◽

Crop Yields ◽

Fish Farming ◽

Fish Ponds ◽

Average Value ◽

Fish Breeding ◽

Feed Costs ◽

The Cost ◽

Fish Productivity

The use of the crop rotation method in fish farming makes it possible to increase fish productivity and crop yields in ponds. In the countries of the Middle East, in recent years, the Aqua Crop rotation practice has been developing, in particular, the consistent cultivation of fish and rice in fish ponds, which allows eliminating the contradictions between these crops and increasing production efficiency. In Iraq, an experiment was carried out on the variable cultivation of rice and carp in fish ponds for four years, with the aim of introducing this practice into the country’s agriculture. Four ponds, each with an area of 7.5 hectares, were involved. The research was carried out in two variants: in experiment No.1 rice was grown in the first year, fish in the second, then rice again and in the fourth year — fish, in the second experiment, on the contrary, at the beginning of the fish, then rice, etc. The fish-breeding season lasted 9 months (March to November). Fish-breeding indicators were studied in detail: survival rate, feed costs, fish productivity, the results of rice cultivation were judged by yield. In addition, indicators of economic efficiency were determined according to a simplified scheme. The results indicate that, in general, fish-breeding indicators turned out to be higher when growing fish in ponds after rice, so fish productivity increased by almost 30% with an average value of 3.9 t/ha, feed costs decreased, while rice yield increased by 15–16% and averaged 3.6 t/ha. The best fish-breeding indicators were obtained in the second experiment after rice was grown in the ponds for two years. Economic calculations confirmed the advantages of using the aquacrop rotation practice, so in the second experiment the cost of marketable fish decreased by 10%, and the profitability increased by almost 30%.

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Small Water Retention Measures in Haluzice Gorge

10.1007/978-3-030-51812-7_6-1 ◽

2021 ◽

pp. 1-7

Author(s):

Richard Müller

Keyword(s):

Water Retention ◽

Small Water

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Enzymes as Biomarkers of Environmental Stress in African Catfish (Clarias gariepinus) in Osun State, Nigeria

Journal of Health and Pollution ◽

10.5696/2156-9614-7.14.71 ◽

2017 ◽

Vol 7 (14) ◽

pp. 71-83

Author(s):

Omolara Titilayo Aladesanmi ◽

Femi Kayode Agboola ◽

Rapheal Emuebe Okonji

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Anthropogenic Activities ◽

Clarias Gariepinus ◽

Fish Farming ◽

Fish Tissue ◽

Enzymatic Activities ◽

African Catfish ◽

Fish Ponds ◽

Bioindicator Species

Background. Many natural aquatic bodies have been contaminated with heavy metals released from domestic, industrial and other anthropogenic activities. Fish are an important bioindicator species and play an important role in the monitoring of water pollution. Objectives. This study shows the effect of heavy metals on the distribution of glutathione S-transferases (GST), catalase, rhodanese and 3-mercaptopyruvate sulphur transferase (3-MST) isolated from the liver, gills, fins and muscle of Clarias gariepinus. Methods . Glutathione S-transferase, catalase, rhodanese and 3-mercaptopyruvate S-transferase enzymes were isolated from the liver and gills of fish by homogenization of each tissue (with specific buffers for each enzyme) and centrifugation. Serial dilutions of the crude enzymes were then assayed for residual enzymatic activities using standard enzyme assay protocol. Results. The results showed heavy metals in the liver and muscle of the investigated fish. This study indicated significant accumulation of heavy metals in the tissues/organ of the fish from Ilesha, Osogbo and Yakoyo fish ponds. These are three main towns in Osun State where the major occupation is fish farming. The relationship between enzymatic activities and heavy metal content in C gariepinus tissue showed positive and significant (p<0.05) correlations between lead (Pb) and GST as well as chromium (Cr) and GST. This implies that higher concentrations of Pb and Cr induced the expression of greater GST activity in the fish tissue. Conclusions. The study concluded that the pattern of response of GST, catalase, rhodanese and 3-MST activities in the various organs/tissues of C gariepinus to the heavy metals suggests that the excitation or inhibitions of their activities are organ specific. Further biochemical studies of fish tissues/organs are needed to characterize the enzymatic changes associated with heavy metal pollution. Competing Interests: The authors declare no competing financial interests

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The impact of dredging of a small lowland river on water beetle fauna (Coleoptera)

Journal of Limnology ◽

10.4081/jlimnol.2016.1270 ◽

2016 ◽

Cited By ~ 3

Author(s):

Piotr Dabkowski ◽

Paweł Buczynski ◽

Andrzej Zawal ◽

Edyta Stepien ◽

Edyta Buczynska ◽

...

Keyword(s):

Species Number ◽

Lowland River ◽

Fish Ponds ◽

Sediment Composition ◽

Small Water ◽

Water Beetle ◽

Dominance Structure ◽

Aquatic Beetle ◽

The Impact ◽

Nw Poland

<p>Using the example of a regulated stretch of the Krąpiel River (NW Poland), an analysis of the impact of dredging on the aquatic beetle (Coleoptera) fauna was made. After dredging the beetle fauna became markedly poorer quantitatively and had lower species diversity. Moreover, the qualitative composition and dominance structure were highly transformed. However, species number and diversity increased rapidly and were restored within just half a year. The structure of the restored fauna was most strongly influenced by vegetation, flow velocity and bottom sediment composition. The first to colonize the river were eurytopic beetles and species typical of small water bodies, which had significant refuges in the form of fish ponds bordering on the river; these species dominated the assemblage throughout the study period. Rheophiles with less dispersal power appeared later, and finally rheobionts, in low numbers but occupying an increasing number of sampling sites. </p>

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Antimicrobials use and resistance on integrated poultry-fish farming systems in the Ayeyarwady Delta of Myanmar

Scientific Reports ◽

10.1038/s41598-020-73076-2 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Justine S. Gibson ◽

Honey Wai ◽

Shwe Sin May Lwin Oo ◽

Ei Moh Moh Hmwe ◽

Soe Soe Wai ◽

...

Keyword(s):

Antimicrobial Resistance ◽

Production Systems ◽

Farming Systems ◽

Fish Farming ◽

Fish Ponds ◽

Fish Farms ◽

E Coli ◽

Livestock Species ◽

Poultry Farms ◽

Livestock Health

Abstract Antimicrobials are used to support livestock health and productivity, but might pose a risk for the development of antimicrobial resistance; in particular, when multiple livestock species are raised together in production systems. On integrated chicken-fish farms, chickens are raised over fish ponds and poultry faeces is excreted into the ponds. We investigated antimicrobial usage and the antimicrobial susceptibility of Escherichia coli cultured from poultry faeces on 301 integrated farms in Ayeyarwady Delta of Myanmar. Antimicrobials were used by 92.4% of farmers for chickens, but they were not applied to fish. The most common antimicrobials used were Octamix (amoxicillin and colistin sulfate) on 28.4%, enrofloxacin on 21.0% and amoxicillin on 16% of farms. Overall, 83.1% (152/183) of the E. coli were resistant to at least one antimicrobial. The highest level of resistance was to amoxicillin (54.6%), tetracycline (39.9%), sulfamethoxazole/trimethoprim (35.5%) and enrofloxacin (34.4%). Multidrug resistance was identified in 42.4% of isolates. In general, we found similar levels of antimicrobial resistance in non-users of antimicrobials as in users of antimicrobials for more commonly applied antimicrobials. Overall, antimicrobial resistance was lower in chickens on these integrated farms in Myanmar, compared to poultry farms in other countries of South East and East Asia.

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