3 research outputs found
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Session E8: Efficiency Measurements as Tool in Evaluating Fishways
Abstract:
The awareness of the importance of free fish migration in the Netherlands is reflected in the increasing number of fishways that has been built in the past decade. The intention is that all the bottlenecks will be solved before 2027.
Equally important as the realization of fishways, is the evaluation of the design. In other words, are all species and size classes that want to pass, truly able to pass the structure. The challenge in this type of research is to avoid interference of the measuring tools with the fish migrants. The conventional monitoring fyke, does not meet this requirement. Migration is obstructed and the gear is highly selective for small fish. Emerging electronic techniques offer this opportunity and makes it possible to watch fish migration behaviour on the road through the fishway. The use of a resistivity Fish Counter will be illustrated by means of a case study.
The counter detects the swimming direction and size of the passing fish. Species identification is achieved by the application of a camera, triggered by the passing fish. The placement of a counter station at both sides of the fishway, gives the unique opportunity to determine the efficiency in terms of the ratio between the number of fish entering the downstream side and the number of fish exiting at the upstream side. An example will be given of a fishway that originally was reviewed as a good functioning construction.
However, measurements of the efficiency showed that only a small part of the fish community was able to pass. The results also uncovered the weak spot in the design. This was not regarded as a failure, but as an opportunity to make use of the hidden potential of this fishway. It also contributed to the improvement of this type of design in general
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Session B2: VisAdvies Protocol for Testing and Evaluating Pumping Station Pumps on Fish Survivability
Abstract:
In the context of fish welfare, pump manufacturers focus on the development of fish friendly pumps. The assessment of fish survivability in a field situation turns out to be difficult. Lack of migration (eels), presence of fish or insufficient species composition with a narrow range in length class at the moment of the research leads to unreliable conclusions. Therefore a guideline is developed, based on forced exposure of fish, to test and evaluate fish friendly pumps with a standardized method: “VisAdvies protocol for testing and evaluating pumping station pumps on fish survivability”. The protocol serves two purposes. First, the guideline gives direction to the way the test should be performed.
It advises in the fish species the numbers and size classes and the zero-groups (untreated fish) that should be used. It describes how damage and mortality should be categorized in different groups. Part of the test is the assessment of of delayed mortality that may take place a few days after the actual test.
In the second place is the guideline concerned with the evaluation of the results. The final outcome gives the score, based on the survivability rate of all species. A separate test should be carried out for all combinations of pump speed (rpm), discharge (m3/min), and head (m) that are of interest.
The protocol will be illustrated by means of a test in a dry dock in the Netherlands, on a pump of the Bedford company. The pump was especially designed to be fish friendly
Do I Care Enough To Engage? : An Investigation on Contributor Engagement Towards the Dutch Cancer Society
Abstract Background: The environment of the charity sector is changing. The overall sector of licensed charities in the Netherlands grew over the past couple of years, but this trend is not caused by a growth in contributors, as the numbers show a downwards slope. Besides that, research shows that the individual’s willingness to contribute to charity declines. Next to that, it is visible that the needs and wishes of contributors to charity change. This could possibly imply that individuals are willing to engage with charity, but in a different manner. Purpose: The way contributors contribute to charitable organisations is evident, but how and why individuals engage is a relatively unexplored area, as previous research mainly focused on the motivations rather than the dimensions of engagement. Therefore, the research purpose of this paper is to investigate the dimensions of engagement of Dutch individuals towards DCS, whilst it adds to the existing body of literature about contributor engagement in the charity sector. Method: The study revolved around a positivistic research philosophy, following a sequential mixed-method research design to gather the information and insights needed. A questionnaire was used to obtain the inputs of 333 unique respondents, which was followed up by 10 semi-structured in-depth interviews to enrich the findings. To analyse the data, various techniques, such as factor analysis, correlation and multiple regression, were executed to reveal statistically significant relationships and influences among the variables. Conclusion: The results show that the five dimensions of volunteer engagement, namely behavioural, emotional, cognitive, spiritual and social, are also applicable when investigating contributor engagement. However, the study has shown that all dimensions apart from the spiritual one have a statistically significant influence on the contributor engagement of Dutch individuals towards DCS. Further findings and a more profound understanding of the motives of interviewees revealed that the deeper motivations to engage or not engage with DCS are in line with national trends visible within the charity sector. The outcomes could contribute to DCS’ and possibly other charitable organisations’ understanding of the altering needs and wishes of contributors and the Dutch society. More specifically, the findings can contribute to the existing knowledge of the dimensions of engagement and could be utilised for marketing purposes to focus on the right areas when developing future strategies