Essays about: "fish ladders"

Showing result 1 - 5 of 7 essays containing the words fish ladders.

  1. 1. Predict sex in salmonids using motion-triggered cameras and artificial intelligence

    University essay from SLU/Dept. of Wildlife, Fish and Environmental Studies

    Author : Albin Bidner; [2023]
    Keywords : census method; salmon; trout; al; camera technology;

    Abstract : As the EU water directive starts to be implemented in Swedish law a new national plan of negotiating new environmental permits for every hydropower plant. This process will most likely result in the building of many new fish passages and ladders around the dams to allow fish and other aquatic life to pass them. READ MORE

  3. 2. Convolutional neural network based object detection in a fish ladder : Positional and class imbalance problems using YOLOv3

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Patrik Ekman; [2021]
    Keywords : Object detection; Computer vision; Fish ladder; Imbalance problems; Imbalanced data; YOLO; Convolutional Neural Network; Deep learning; Objektdetektering; Datorseende; Fisktrappa; Obalanser; Obalanserad data; YOLO; Convolutional Neural Network; Djupinl¨arning;

    Abstract : Hydropower plants create blockages in fish migration routes. Fish ladders can serve as alternative routes but are complex to install and follow up to help adapt and develop them further. In this study, computer vision tools are considered in this regard. READ MORE

  4. 3. Study of a vertical slot fish ladder : Evaluation of flow dynamics through a standardized bypass and the effect of predesigned roughness elements

    University essay from Högskolan i Gävle/Avdelningen för byggnadsteknik, energisystem och miljövetenskap

    Author : Iñigo Revilla; Laia Pons; [2020]
    Keywords : Vertical slot fishway; roughness element; pattern; slope; velocity; turbulence; Fluent;

    Abstract : Migrating freshwater fish population has been significantly declined, mostly by the obstruction of their migratory routes by hydropower dams. To diminish such impacts, fish ladders have been developed to facilitate the passage of migrating fish. READ MORE

  5. 4. Highway To Hell: Can a bubble barrier guide descending salmonid kelt to safety?

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Jonathan Nordin; [2020]
    Keywords : bubble barrier; non-physical barrier; fish passage; fish migration; hydropower; bubbelbarriär; icke-fysisk fiskledare; lax; öring; fiskvandring; vattenkraft;

    Abstract : Loss of connectivity in riverine systems due to construction of hydropower dams has resulted in a worldwide decline of anadromous salmonid species such as Atlantic salmon (Salmo salar L.) and sea trout (Salmo trutta L.). The future of these species depend on the presence of available spawning habitat in freshwater river systems. READ MORE

  6. 5. The impact of abiotic factors on daily spawning migration of Atlantic salmon (Salmo salar) in two north Swedish rivers

    University essay from SLU/Dept. of Wildlife, Fish and Environmental Studies

    Author : Anton Holmsten; [2015]
    Keywords : environmental factors; VAKI; fish ladder; waterflow; water temperature; seasonal migration pattern;

    Abstract : Atlantic salmon (Salmo salar) depends on two major migrations to fulfil their life cycle, from their birth place in rivers to sea, and back upstream the river again to spawn. Salmon stocks have been heavily reduced during the last century due to human activities such as hydropower and timber floating. READ MORE