Building adjustment capacity to cope with running water in cultured grass carp through flow stimulation conditions.

The adaptability of cultured fish to complex flow conditions is crucial for their survival after being released into the wild. Running water in natural environments poses significant challenges for the proliferation and release of cultured fish. This study aimed to investigate the effects of flow stimulation on the adjustment capacity of cultured fish to cope with running water. The target fish were cultured grass carp. An annular flume was used to conduct tests on training and control groups. The results demonstrated an enhancement in the adjustment capacity of cultured fish following appropriate flow stimulation training. (1) The trained fish exhibited a heightened preference for low-velocity areas. (2) The trained fish displayed the ability to select a route characterized by low energy consumption, predominantly following the periphery of the low-velocity area. This suggested that an appropriate flow velocity could improve the sensitivity of training fish to water flow information, and their adjustment capacity to cope with running water improved to a certain extent. A higher adjustment capacity allowed them to process flow rate information rapidly and identify a migration strategy with lower energy consumption. This study provides a useful reference for enhancing the survival rate of grass carp through stock enhancement initiatives and contributes to the sustainability of freshwater ecosystems.

The effect of 20 minutes of cool running water first aid within three hours of thermal burn injury on patient outcomes: A systematic review and meta-analysis.

BACKGROUND: Burn injuries are a leading cause of morbidity that can result in devastating disability and poor quality of life for survivors. This systematic review aimed to synthesise evidence regarding the effect of 20 minutes of cool running water (CRW) within three hours of injury on outcomes of patients with thermal burn injuries. METHODS: This systematic review was conducted in reference to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses. Multiple databases (PubMed, EMBASE, CENTRAL, CINAHL Complete via EBSCO, PROQUEST Dissertations and Theses), and the Australia New Zealand Clinical Trial Registry were searched for eligible studies published in English and Chinese, without date restriction. Meta-analyses were undertaken Methodological quality of studies was assessed by using Downs and Black Checklist. RESULTS: Of 323 records, seven studies were included. The majority (67%) of studies were conducted in Australia and New Zealand. The methodological quality was ranked between 'fair' and 'good'. Twenty minutes of CRW within the first three hours of burn injury significantly decreased the odds of patients requiring skin grafting and surgical intervention for wound management. CONCLUSIONS: There is considerable evidence suggesting the application of 20 min of CRW within the first three hours of injury improves outcomes for patients with burn injury. Consensus between burn organisations and collaborative efforts to translate evidence into practice are needed to optimise burn first aid care which can improve patient outcomes globally.

River ecosystem processes: A synthesis of approaches, criteria of use and sensitivity to environmental stressors.

River ecosystems are subject to multiple stressors that affect their structure and functioning. Ecosystem structure refers to characteristics such as channel form, water quality or the composition of biological communities, whereas ecosystem functioning refers to processes such as metabolism, organic matter decomposition or secondary production. Structure and functioning respond in contrasting and complementary ways to environmental stressors. Moreover, assessing the response of ecosystem functioning to stressors is critical to understand the effects on the ecosystem services that produce direct benefits to humans. Yet, there is more information on structural than on functional parameters, and despite the many approaches available to measure river ecosystem processes, structural approaches are more widely used, especially in management. One reason for this discrepancy is the lack of synthetic studies analyzing river ecosystem functioning in a way that is useful for both scientists and managers. Here, we present a synthesis of key river ecosystem processes, which provides a description of the main characteristics of each process, including criteria guiding their measurement as well as their respective sensitivity to stressors. We also discuss the current limitations, potential improvements and future steps that the use of functional measures in rivers needs to face.

Bacteria in drinking water sources of a First Nation reserve in Canada.

Approximately 20% of the 600 First Nations reserves across Canada are under a drinking water advisory, often due to unacceptable levels of bacteria. In this study, we detected fecal bacteria at an alarmingly high frequency in drinking water sources in a fly-in First Nations community, most notably in buckets/drums of homes without running water where Escherichia coli levels ranged from 20 to 62,000CFU/100mL. The water leaving the water treatment plant was free of E. coli and its free residual chlorine concentration (0.67mg/L) was within the range typically observed for treated water in Canada. Water samples from taps in homes served by cisterns, and those sampled from the water truck and community standpipe, always showed unacceptable levels of E. coli (1 to 2100CFU/100mL) and free residual chlorine concentrations below the 0.2mg/L required to prevent bacterial regrowth. Samples from taps in homes served by piped water had lower levels of E. coli (0 to 2CFU/100mL). DNA- and RNA-based 16S rRNA Illumina sequencing demonstrated that piped and cisterns water distribution systems showed an abundance of viable cells of Alphaproteobacteria indicative of biofilm formation in pipes and cisterns. The alpha diversity, based on observed OTUs and three other indices, was lowest in water truck samples that supplied water to the cistern and the low free residual chlorine concentration (0.07mg/L) and predominance of Betaproteobacteria (63% of viable cells) that were immediately detected after the truck had filled up at the water treatment plant was indicative of contamination by particulate matter. Given these findings, First Nation residents living without running water and relying on inadequate water distribution systems are at higher risk of contracting water-born illnesses. We urge all governments in Canada to expand their investments in supporting and sustaining water as a human right in Canada's First Nations communities.

Asymmetric dispersal structures a riverine metapopulation of the freshwater pearl mussel Margaritifera laevis.

Unidirectional water flow results in the downstream-biased, asymmetric dispersal of many riverine organisms. However, little is known of how asymmetric dispersal influences riverine population structure and dynamics, limiting our ability to properly manage riverine organisms. A metapopulation of the freshwater pearl mussel Margaritifera laevis may be sensitive to river currents because mussels are repeatedly exposed to downstream drift during floods-a parasitic life stage is the only, limited period (∼40 days) during which larvae (glochidia) can move upstream with the aid of host fish. We hypothesized that water-mediated dispersal would overwhelm upstream dispersal via host fish, and therefore, that upstream subpopulations play a critical role as immigrant sources. To test this hypothesis, we examined the effects of both up- and downstream immigrant sources on the size of target subpopulations in the Shubuto River system, Hokkaido, Japan. We found that target subpopulation size was dependent on the upstream distribution range of reproductive subpopulations and the number of upstream tributaries, which are proxies for the number of potential immigrants moving downstream. In contrast, little influence was observed of downstream immigrant sources (proximity to downstream reproductive subpopulations). These results were consistent even after accounting for local environments and stream size. Our finding suggests that upstream subpopulations can be disproportionately important as immigrant sources when dispersal is strongly asymmetric.

Water supply for households in 3 districts of Quang Binh province and Thua Thien Hue province

A cross-sectional study of the supply and use of water was carried out on 8180 households in 3 districts of Quang Binh province and Thua Thien Hue province. The results showed that: two water sources with high rate of usage were deep well (59.3%) and drilled well (19.2%). The rate of households with adequate water supply was 81.5%, among which deep wells were at highest rate of 48.4%, and tap water were at lowest rate of 1.8%. 58.3% of households were found with water containers including: built tanks (49.3%), buckets (24.7%), earthenware vessels (25.3%). 84.6% of water containers were built far from breeding facilities. 95.4% of wells had high wall, 84.8% with surrounding yards but only 8.8% with covers. It is necessary to improve the quality of living water in public by supplying better water sources

Effects of Under-Water Therapeutic Exercise with Hydropower System on Middle-Aged Lumbago Patients / 日本温泉気候物理医学会雑誌

We subjected six male lumbago patients (average age of 58.2 years) to underwater therapeutic exercise with and without a hydropower system (Flow Machine (FM)) twice a week for 4 weeks (a total of 10 hours) at an interval of 10 weeks between the two therapeutic sessions. The FM produced running water (average speed of 0.9meter/second) in a temperature-controlled pool. The water temperature was kept to about 30°C, The subjects received a total of four examinations before and after these two therapeutic sessions. We compared the results of these two therapeutic sessions (under-water therapeutic exercise with FM and without FM) and obtained the conclusions described below.<br>Improvements of obesity, anaerobic power, power around knee, vital capacity and total score in lumbago treatment (results of Japanese Orthopaedic Association) were observed more significantly (p<0.05) and rapidly with the use of FM than without FM. Further, increased HDL-cholesterol and decreased free fatty acid in blood were observed significantly (p<0.05) only for FM use.<br>It was suggested that the resistance of running water, vibratile massage effect, and heat action of produced supersonic waves promoted the above improvements. We concluded that the hydropower system was useful in underwater therapeutic exercise on lumbago patients.