Mass balance of fishponds: are they sources or sinks of phosphorus?

Potužák, Jan; Duras, Jindřich; Drozd, Bořek

doi:10.1007/s10499-016-0071-4

Cited by 27 publications

(11 citation statements)

References 25 publications

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“…1). It ranks among the ten largest Czech fishponds, having a surface area of 2.28 km 2 , maximum and mean depths of 5.5 and 2.2 m, respectively, and a catchment area of 91.4 km 2 (Potužák et al, 2016). It is used as a polyculture semi-intensive fishpond.…”

Section: Study Areamentioning

confidence: 99%

Carbon metabolism and nutrient balance in a hypereutrophic semi-intensive fishpond

Rutegwa

Potužák

Hejzlar

et al. 2019

Knowl. Manag. Aquat. Ecosyst.

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Eutrophication and nutrient pollution is a serious problem in many fish aquaculture ponds, whose causes are often not well documented. The efficiency of using inputs for fish production in a hypereutrophic fishpond (Dehtář), was evaluated using organic carbon (OC), nitrogen (N) and phosphorus (P) balances and measurement of ecosystem metabolism rates in 2015. Primary production and feeds were the main inputs of OC and contributed 82% and 13% to the total OC input, respectively. Feeds and manure were the major inputs of nutrients and contributed 73% and 86% of the total inputs of N and P, respectively. Ecosystem respiration, accumulation in water and accumulation in sediment were the main fates of OC, N and P, respectively. They accounted for 79%, 52% and 61% of OC, N and P inputs. The efficiency of using OC, N and P inputs to produce fish biomass was very low and represented 0.9%, 25% and 23% of total OC, N, and P inputs, indicating an excessive phytoplankton production and overdosing of fish feeds and manure. Dehtář pond was slightly autotrophic and phosphorus availability did not limit the phytoplankton growth. The low efficiency of using inputs was attributed to the low digestibility of raw cereals grain used as feed and the inability of planktonic food webs to transfer the primary production to fish due to high predatory pressure of fish stock on zooplankton. The primary production is an important input of OC in semi-intensive fishponds and should be considered in evaluations of fish production efficiency.

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Section: Study Areamentioning

confidence: 99%

Carbon metabolism and nutrient balance in a hypereutrophic semi-intensive fishpond

Rutegwa

Potužák

Hejzlar

et al. 2019

Knowl. Manag. Aquat. Ecosyst.

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“…Studied hypertrophic and eutrophic fishponds (with a mean TP of 200 µg L −1 and 130 µg L −1 , respectively) were used for commercial fish farming. The high concentration of TP was caused by weekly auxiliary feeding by cereals, which added more than 50% of the overall nutrient supply to the pond ecosystem [32,33]. On the other hand, mesotrophic ponds, with a mean TP concentration of 40 µg L −1 , were used only for recreational fishing.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, mesotrophic ponds, with a mean TP concentration of 40 µg L −1 , were used only for recreational fishing. Their P input came mainly from the inflows, and less than 5% came from fishery management [32]. These different trophic levels significantly influenced phytoplankton communities and overall seasonal plankton development.…”

Section: Discussionmentioning

confidence: 99%

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Seasonal Development of Phytoplankton in South Bohemian Fishponds (Czechia)

Ivanova

Vrba

Potužák³

et al. 2022

Water

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Fishponds with a relatively small water volume, high fish abundance, and wide range of nutrient concentrations serve as suitable models for ecological studies. Intensified fish production, together with increased input of nutrients from the watershed, resulted in hypertrophic conditions in the majority of fishponds, the most common type of lentic ecosystems worldwide. In order to understand the processes driving plankton succession, we analyzed eight-year data from nine fishponds in Czechia with differing trophic status. The mean concentration of phosphorus (P) was 200 µg L−1 in hypertrophic ponds, 130 µg L−1 in eutrophic, and 40 µg L−1 in mesotrophic. Correspondingly the mean concentration of phytoplankton was 14.9 mg L−1 in hypertrophic ponds, 7.3 mg L−1 in eutrophic, and 1.96 mg L−1 in mesotrophic. Although the fish stock of 200–900 kg ha−1 eliminated zooplankton in eutrophic and hypertrophic ponds the faster-growing algae did not prevail over cyanobacteria. Zooplankton grazing pressure on algae is thus not relevant in studied food webs. Due to the rapid biological denitrification in hypertrophic and eutrophic fishponds resulting in low concentration of mineral nitrogen (N), these ponds were dominated by N-fixing cyanobacteria throughout the whole season. Similarly, the faster-growing algae prevail over cyanobacteria in mesotrophic ponds until the decrease of available mineral nitrogen. The limitation by mineral N is thus the primary driver of phytoplankton composition reflected in cyanobacterial dominance, independently of the trophic status and fish density in studied fishponds.

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“…Building man-made ponds can also be seen as a significant anthropogenic impact on the landscape (Hoffmann, 2002), which dramatically affects natural hydrological and geomorphological processes (Walter and Merrits, 2008). Their contribution to groundwater recharging is sometimes disputed (Kale, 2017), as well as their ecological functions when they can disturb the natural migration trajectories of certain fish species (DeFries et al, 2019), change the quality of water in the watercourses (Igantius and Rasmussen, 2016), store the environmental pollutants from anthropogenic activity (Bábek et al, 2021), or create eutrophic or hypertrophic conditions due to the increased nutrient loading from agriculture and settlement (Potužák, 2016). The lack of maintenance or unsuitable management of man-made ponds may lead to the loss of some hydrological functions (Výleta, 2020), which may also cause the threat of dam burst or overflowing of man-made ponds during flood events (Lhotský, 2010).…”

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confidence: 99%

The importance of historical maps for man-made pond research: From the past extent of ponds to issues of the present landscape. A case study from the Czech Republic

Frajer

Kremlová

Fiedor

et al. 2021

Moravian Geographical Reports

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Historical maps are a valuable resource in landscape research. The information gathered from them facilitates the cognisance of landscapes and may assist current landscape planning. This study focuses on the historical occurrence and spatial extent of man-made ponds in the Czech Republic. Based on the 1st Military Survey maps (1764–1783) of the Habsburg Monarchy, we use Historical GIS to identify 7,676 man-made ponds in the historical landscape. Compared to the 2nd Military Survey maps (1836–1852), 56% of these man-made ponds had been drained. Such disappearances mostly affected large ponds in fertile agricultural areas, but also affected small reservoirs in less fertile areas at higher altitudes. As the current maps and spatial datasets (Water reservoirs, Landscape water regime, Farming areas) show, a number of these agricultural regions have been affected by climate changes and face water shortages. The historical map information of former ponds has the potential to contribute to their restoration in areas where water retention in the landscape needs to be increased.

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Mass balance of fishponds: are they sources or sinks of phosphorus?

Cited by 27 publications

References 25 publications

Carbon metabolism and nutrient balance in a hypereutrophic semi-intensive fishpond

Carbon metabolism and nutrient balance in a hypereutrophic semi-intensive fishpond

Seasonal Development of Phytoplankton in South Bohemian Fishponds (Czechia)

The importance of historical maps for man-made pond research: From the past extent of ponds to issues of the present landscape. A case study from the Czech Republic

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