Assisted management of water exchange in traditional semi-intensive aquaculture ponds

Aquaculture is currently the foundation of the world's animal protein provider. The sustainability of this sector is greatly influenced by business governance which must prioritize environmentally friendly aspects. Nutrient enrichment waste and the spread of fish and other aquatic organisms are significant issues present in aquaculture systems throughout the world today, especially intensive aquaculture. The purpose of writing this article is to provide an overview of biofloc as a solution in overcoming environmental problems for a sustainable future aquaculture. Intensive aquaculture applies high density maintenance and artificial feeding. The system leads to environmental problems because a large amount of waste produced contains solids and nutrients that accumulate into pollutants that cause eutrophication and toxins for aquatic organisms. Biofloc technology is a new approach to reduce the waste of aquaculture activities. In this system, heterotrophic bacteria and algae are grown together in flocks under controlled conditions with no or minimal water exchange. Biofloc is a nutrient package that can be utilized directly by farm animals. Biofloc also acts as biocontrol. Biofloc technology can help overcome problems in intensive aquaculture.

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Influence of eco-substrate addition on organic carbon, nitrogen and phosphorus budgets of intensive aquaculture ponds of the Pearl River, China

Aquaculture ◽

10.1016/j.aquaculture.2019.734868 ◽

2020 ◽

Vol 520 ◽

pp. 734868

Author(s):

Kai Zhang ◽

Deguang Yu ◽

Zhifei Li ◽

Jun Xie ◽

Guangjun Wang ◽

...

Keyword(s):

Organic Carbon ◽

Pearl River ◽

Nitrogen And Phosphorus ◽

Aquaculture Ponds ◽

Phosphorus Budgets ◽

The Pearl River ◽

Intensive Aquaculture ◽

Substrate Addition

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Accumulation and seasonal variation of toxic and trace elements in tissues of Cyprinus carpio from semi-intensive aquaculture ponds

Annales de Limnologie - International Journal of Limnology ◽

10.1051/limn/2017036 ◽

2018 ◽

Vol 54 ◽

pp. 4

Author(s):

Zorka Dulić ◽

Ivana Živić ◽

Marija Pergal ◽

Miroslav Živić ◽

Marko Stanković ◽

...

Keyword(s):

Trace Elements ◽

Seasonal Variation ◽

Cyprinus Carpio ◽

Gut Contents ◽

Fish Liver ◽

Fish Muscles ◽

Aquaculture Ponds ◽

Polluted Sites ◽

Investigation Period ◽

Intensive Aquaculture

The aim of this study was to assess the accumulation and seasonal variations of 20 toxic and trace elements in the abdominal and dorsal muscle (DM), liver and gut contents (GCs) of Cyprinus carpio, and in the sediments and zooplankton from semi-intensive aquaculture ponds during a six-month production season (from May to October). Sediments showed the highest concentrations of the measured elements, followed by zooplankton, fish GCs and livers, while the lowest levels were present in fish muscles. Correspondence analysis revealed that the elemental composition of the fish GCs was mostly similar to that of the sediment and zooplankton. The element concentrations of carp liver and muscles were more similar to each other. Overall, the results indicate that fish liver was the main target organ accumulating Cu, Se and Zn, regardless of their initial amounts in the environment. A seasonal decrease of a range of elements in fish liver (Al, Co, Fe, Li, Mn, Ni, Pb and Sr) was evident towards the end of the investigation period. In addition, the fish DM showed a seasonal accumulation of Sr and Li. However, toxic elements i.e. As, B, Ba Hg and V did not show such a seasonal variation, and were evenly distributed between fish liver and muscles. The concentrations of some elements, such as As, in fish tissues were similar or even higher than in literature data from polluted sites, but none of them exceeded the maximum acceptable concentrations prescribed by Serbian legislation or by FAO or EU regulation.

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The main principles and results of pollution monitoring of sediments in the river basin

Melioration and Water Management ◽

10.32962/0235-2524-2019-4-14-20 ◽

2020 ◽

pp. 14-20

Author(s):

B. Korzhenevsky ◽

Gleb Tolkachev ◽

Nikolay Kolomiycev

Keyword(s):

Heavy Metals ◽

River Basin ◽

Water Exchange ◽

Pollution Monitoring ◽

Small Rivers ◽

Volga River ◽

Natural Landscape ◽

Volga River Basin ◽

Ivankovo Reservoir ◽

Selection Of

The problems of modern geological ecology associated with the study of pollution of sediments of water bodies by heavy metals are considered. The Volga River basin is quite heterogeneous, both in geomorphological and hydrological terms, and in thechnogenical development and usage. A fourrank taxonomy is presented for the selection of sites for monitoring, based on a combination of natural, landscape, climatic and thechnogenical factors. To the largest – the highest taxon – sites of the Ist category – bowls of reservoirs with the slopes and the urban zones, industrial and agricultural structures located within them are carried. Within these areas are allocated to smaller taxa, areas category IInd are the industrial and urban zones, areas category IIIrd are the small rivers without significant contamination and areas category IVth to conduct special observations. The examples of special observations in the study of the annual migration of heavy metals in the system «bottom sediments – water column» on the Ivankovo reservoir are highlighted. The investigations were carried out under the conditions of the standard flow rate for this reservoir and in the conditions of slow water exchange.

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