Essays about: "electrofishing"

Showing result 1 - 5 of 15 essays containing the word electrofishing.

  1. 1. Evaluation of restoration efforts in Dalälven - conditions for survival rate of Salmo trutta and Salmo salar

    University essay from Uppsala universitet/Institutionen för biologisk grundutbildning

    Author : Ville Svärd; [2023]
    Keywords : Restoration; river; salmonids; benthic fauna;

    Abstract : Rivers are among the most anthropogenically affected ecosystems in the world by irrigation, transportation, channelizing, and hydropower. Habitat restorations have become a popular method to restore the heterogeneity and complexity of rivers aiming for improvement of biodiversity. READ MORE

  3. 2. Dispersal and habitat use of juvenile brown trout (Salmo trutta) following egg stocking : -A case study in the river Rotälven, Sweden

    University essay from Karlstads universitet/Institutionen för miljö- och livsvetenskaper (from 2013)

    Author : Jonathan Larsson; [2022]
    Keywords : brown trout; egg stocking; dispersal; alevin; fry; parr; redd; habitat preference; Öring; romutsättning; spridning; yngel; parr; habitatpreferens;

    Abstract : Egg stocking in rivers and streams is a common measure to support and re-introduce salmonid populations. To ensure the success of egg stocking programs, knowledge of the early life stages of juveniles including dispersal ability and habitat preferences of fry is a prerequisite. READ MORE

  4. 3. Stream size determines densities of larger juvenile brown trout in mountain streams

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

    Author : Mattias Melin; [2021]
    Keywords : Habitat availability; juvenile brown trout; stream size; population structure;

    Abstract : The productivity or availability of juvenile habitats have theoretically been shown to determine size distributions of adult individuals and population abundance. Brown trout (Salmo trutta) is a species where adults may inhabit lakes and use connected streams for spawning and as nursery habitats for juveniles. READ MORE

  5. 4. Återetablering av öring (Salmo trutta L.) med romutsättning : hur effektiv är metoden?

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

    Author : Valdemar Samuelsson; [2021]
    Keywords : romutsättning; återetablering; Salmo trutta; öring; Whitlock-Vibert Boxes;

    Abstract : Många vattendrag har påverkats negativt av människan, vilket medfört förändrade förutsättningar för de arter som lever i dessa miljöer. Arter som öring (Salmo trutta) är beroende av biotoper med lämpliga ståndplatser, lekbottnar samt uppväxtområden, dessa habitat har reducerats drastiskt vid exploatering av vattendragen. READ MORE

  6. 5. Sampling methods of the wels catfish (Silurus glanis) in freshwater lakes : management of a vulnerable species

    University essay from SLU/Dept. Of Aquatic Resources

    Author : David Östby; [2018]
    Keywords : sampling; gear; monitoring; Wels catfish; Silurus glanis; management; vulnerable spieces; electrofishing; acoustic camera; fyke nets; lake;

    Abstract : Sweden hosts the northernmost natural population of wels catfish (Silurus glanis) in the world. The populations of the species decreased severely in the 20th century, mainly due to different sources of anthropogenic impact. READ MORE