The concept of balanced fish nutrition in temperate European fishponds to tackle eutrophication

Roy, Koushik; Vrba, Jaroslav; Kajgrová, Lenka; Mráz, Jan

doi:10.1016/j.jclepro.2022.132584

Cited by 11 publications

(3 citation statements)

References 59 publications

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“…Compared to conventional plant feed, insect feed is more efficient, particularly when defatted or hydrolysed, 111 and additionally reduces nutrient losses therefore reduces the cost of dealing with eutrophication 112 . Increasing the proportion of insect in the fish diet increases strength of fish immune system 113 and better performance of the gastrointestinal tract 114 resulting in better growth and higher revenues. Although it was demonstrated that by controlling the feedstock on which insects are fed it is possible to alter the level of saturated fatty acids (including omega‐3) therefore the profitability of these advances must be assessed directly in relation to the capabilities of the particular IFA and the purchasing preferences of its customers 115 .…”

Section: Discussion and Techno‐economic Considerationsmentioning

confidence: 99%

Insect rearing on biowaste represents a competitive advantage for fish farming

Maroušek

Strunecký

Maroušková

2022

Reviews in Aquaculture

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Section: Discussion and Techno‐economic Considerationsmentioning

confidence: 99%

Insect rearing on biowaste represents a competitive advantage for fish farming

Maroušek

Strunecký

Maroušková

2022

Reviews in Aquaculture

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“…Розумінню механізмів адаптації риб до умов існування сприяє вивчення гематологічних показників риб, що вирощуються за різного рівня інтенсифікації, а також риб з різних за ступенем антропогенного впливу водойм (Roy et al, 2022).…”

Section: вступunclassified

Hematological indicators of the blood of males and females of the Ukrainian scaled carp breed

et al. 2023

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The research results on hematological indicators of males and females of the Ukrainian scaly breed of carp grown in the conditions of a fish farm in the Dnipropetrovsk region are given. In Ukraine, carp cultivation is becoming an increasingly popular method of commercial fish production. At the same time, the hydrochemical and temperature regimes of the reservoir have important practical significance for the average growth and development of fish since the intensity of respiration, metabolic processes, fish nutrition, motor activity, and resistance to various diseases depend on the chemical composition and temperature of the water. The process of formation of the hydrochemical composition of pond water occurs against the background of climatic changes. Therefore, control of temperature conditions and the physiological state of fish during carp cultivation is an important measure that ensures rational consumption of feed and high growth rates and, in the future, allows to plan of optimal cultivation technology. Therefore, the work aimed to investigate the hematological indicators of blood in males and females of the Ukrainian scaly breed of carp to control their physiological state in the conditions of the hydrochemical and temperature regime of the reservoir of the fish farm. It was established that the main hydrochemical parameters corresponded to the technological standards adopted in fish farming to cultivate carp fish. The hematological parameters of the blood of male and female carp were within the physiological norm. The determined blood composition is natural and characterizes changes in the body of fish according to the season, which reflects adaptation processes in the conditions of seasonal fluctuations in water temperature. Correlative relationships between carp blood's hematological parameters and their keeping temperature conditions were revealed. The pH of the medium (r = 0.28–0.34) has the most significant effect on hematological indicators of carp blood. A positive correlative relationship was established between water temperature and the level of hemoglobin, a color indicator, and the number of erythrocytes and leukocytes in the blood of fish, which was in the range of r = 0.21–0.26. There was a negative relationship between the water temperature indicator and the content of segmented nuclear neutrophils (r = 0.24). The variance analysis of the one-factor complex revealed a significant and most highly probable influence of the conditions of keeping carp on the hemoglobin content, the number of erythrocytes, leukocytes, and the color index of the carp's blood. The share of influence was from 56.14 to 76.90 %. The amplitude of water temperature is essential for favorable conditions for hydrophones and the formation of a natural feed base. In addition, the environment's temperature affects the speed of biological processes in fish. Therefore, the organization of carp feeding, considering scientifically based norms depending on the protein content in compound feed, water temperature, fish weight, and density of its landing, will contribute to ensuring high fish productivity and rational use of feed.

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“…The model has been widely used in the control and management of water eutrophication, mainly including assessing the algal proliferation in lakes and reservoirs under different scenarios, such as changes in nitrogen and phosphorus inputs in the watershed, nitrogen and phosphorus release from sediments, and hydrodynamic changes, etc. It plays an important role in evaluating the expected effects of eutrophication control technologies in lakes [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Algal Control Measures in Eutrophic Reservoirs Based on Aquatic Ecosystem Models

Zheng,

Liao,

Lin

et al. 2024

Water

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The frequency of freshwater cyanobacterial blooms is increasing globally due to climate change and eutrophication, particularly in reservoirs. Reservoir ecosystems exhibit unique characteristics, and there is a complex relationship between factors such as light, temperature, nutrient salts, hydrology, and algal growth. The impact of the other factors on algal growth varies significantly among different reservoirs. Thus, it is crucial to assess the effectiveness of various algal control measures implemented in different reservoirs. This study conducted a comprehensive assessment by establishing a eutrophication model for the Shanzi Reservoir in Fuzhou City. The model incorporated meteorology, hydrology, carbon dynamics, nutrient cycling, and biological communities. The effectiveness of diverse management measures was systematically evaluated. The findings demonstrate that increasing the water level, reducing nutrient salts in sediments, and implementing ecological fish stocking effectively suppressed algal growth to varying degrees and improved nitrogen and phosphorus levels. Lower water levels and ecological fish stocking had a significant impact on algal reproduction, while sediment reduction had a minimal effect. Conversely, lower water levels and ecological fish stocking did not significantly improve nitrogen and phosphorus concentrations in the reservoir, whereas sediment reduction had a noticeable effect. Consequently, the management strategies for the Shanzi Reservoir should prioritize external control measures and the implementation of ecological fish stocking.

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The concept of balanced fish nutrition in temperate European fishponds to tackle eutrophication

Cited by 11 publications

References 59 publications

Insect rearing on biowaste represents a competitive advantage for fish farming

Insect rearing on biowaste represents a competitive advantage for fish farming

Hematological indicators of the blood of males and females of the Ukrainian scaled carp breed

Evaluation of Algal Control Measures in Eutrophic Reservoirs Based on Aquatic Ecosystem Models

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