Diurnal stratification of oxygen in shallow aquaculture ponds in central Europe and recommendations for optimal aeration

Oberle, Martin; Salomon, Sebastian; Ehrmaier, Bruno; Richter, Peter; Lebert, Michael; Strauch, Sebastian M.

doi:10.1016/j.aquaculture.2018.12.005

Cited by 25 publications

(12 citation statements)

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“…As a fish health indicator, this is important, as ponds exceeding the limits for ammonium, nitrates, and nitrites compromise the development and survival of the organisms (1,(43)(44)(45). In addition, a higher concentration of nitrogenous products in the system can favor higher productivity in the pond, which is usually accompanied by a decrease in dissolved oxygen in the water during the early morning hours (46). According to the results, in fingerlings a greater growth was observed using the control feeding rate (8% with 49% CP), in addition to this, that treatment, it was where the best values of WIs were observed.…”

Section: Discussionmentioning

confidence: 99%

Welfare Indicators in Tilapia: An Epidemiological Approach

et al. 2022

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Interest and concern about rearing methods and their impact on animal welfare have increased. Production evaluation is population-based, and animal welfare analysis should be similar. In fish, the most common welfare indicators are gill state, fin damage, and body condition. The objective of this study was to evaluate the feeding rate effect on the welfare indicators of Oreochromis niloticus using an epidemiological approach. Five growth stages (from 1.2 to 360 g) were studied using four feeding rates as treatments: underfeeding (80%), recommended feeding (100%), and two levels of overfeeding (120% and 140%). The evaluated welfare indicators include the presence of lesions in different body areas and fins, the decrease in body condition index, and their impact on biomass production. Incidence and relative risk were determined for each indicator. Statistically significant associations were found in the indicators of mortality, weight, body condition (K), and presence of evident damage in the caudal and anal fin in all stages. The results showed that the feed rate directly affects the welfare indicators and production. Mortality, weight reduction, K reduction, and caudal and anal fin damage incidence showed to be relevant indicators in all O. niloticus growing stages. As a result of this study, the epidemiological approach seems to be a valuable tool for production. A risk traffic light method is a proposal that could have great potential, with the suggested limits for WI's concerning the individuals present in the culture pond, allowing progressive evaluation and decision-making to correct risky situations.

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Section: Discussionmentioning

confidence: 99%

Welfare Indicators in Tilapia: An Epidemiological Approach

et al. 2022

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“…The shape of hydrological elements, which may change over time, can modulate technological and environmental outcomes [30,[73][74][75]. We measured the compactness, roundness, and eccentricity of four FPV recipient water bodies.…”

Section: Technohydrological and Spatial Attributes Of Fpvsmentioning

confidence: 99%

“…Consequently, the impact of FPV is highly uncertain and will vary between water body types and floatovoltaics designs, including the spatial attributes of the FPV [6]. Diurnal stratification/destratification cycling events are common in ponds as shallow as one meter and play a critical role in oxygen and nutrient mixing within shallow water bodies [29,30]. Stratification generally reduces water quality through reduced mixing and deoxygenation with implications for phytoplankton, nutrient and contaminant loads [29,31].…”

Section: Introductionmentioning

confidence: 99%

The Land Sparing, Water Surface Use Efficiency, and Water Surface Transformation of Floating Photovoltaic Solar Energy Installations

et al. 2020

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Floating photovoltaic solar energy installations (FPVs) represent a new type of water surface use, potentially sparing land needed for agriculture and conservation. However, standardized metrics for the land sparing and resource use efficiencies of FPVs are absent. These metrics are critical to understanding the environmental and ecological impacts that FPVs may potentially exhibit. Here, we compared techno-hydrological and spatial attributes of four FPVs spanning different climatic regimes. Next, we defined and quantified the land sparing and water surface use efficiency (WSUE) of each FPV. Lastly, we coined and calculated the water surface transformation (WST) using generation data at the world’s first FPV (Far Niente Winery, California). The four FPVs spare 59,555 m2 of land and have a mean land sparing ratio of 2.7:1 m2 compared to ground-mounted PVs. Mean direct and total capacity-based WSUE is 94.5 ± 20.1 SD Wm−2 and 35.2 ± 27.4 SD Wm−2, respectively. Direct and total generation-based WST at Far Niente is 9.3 and 13.4 m2 MWh−1 yr−1, respectively; 2.3 times less area than ground-mounted utility-scale PVs. Our results reveal diverse techno-hydrological and spatial attributes of FPVs, the capacity of FPVs to spare land, and the utility of WSUE and WST metrics.

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“…Sunlight is critical for the regulation of the water temperaturea too high temperature reduces the density of oxygen while a too low temperature reduces the fish metabolismand for the production of the natural food in the pondsplankton and photo-synthesis. [8][9] Therefore, real-time monitoring of water quality is essential for protecting and further fostering the aquaculture industry growth.…”

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confidence: 99%