Essays about: "fish survival rate"

Showing result 1 - 5 of 24 essays containing the words fish survival rate.

  1. 1. Effects of summer peaks on brown trout and Atlantic salmon growth and survival in hydropower-regulated Gullspång River

    University essay from Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

    Author : Oscar Hallberg; [2023]
    Keywords : hydropeaking; hydropower; fish; salmon; salmo salar; salmo trutta; summer; survival; growth; parr; fry; korttidsreglering; vattenkraft; salmonid; salmo salar; salmo trutta; tillväxt; överlevnad; lax; öring;

    Abstract : Daily demands for electrical power are met through sub-daily release of turbined water in the form of hydropeaking. Hydropeaking’s changes to stream flow are listed as a threat to biodiversity in river ecosystems as it causes rapid habitat alteration such as increased depth and velocity, affecting the species living downstream. READ MORE

  3. 2. 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

  4. 3. Snow cover related camouflage mismatch decreases survival

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

    Author : Pieter Otte; [2022]
    Keywords : climate change; snow cover; seasonal colour coat; crypsis; mismatch; camera trap; survival analysis;

    Abstract : Climate change is expected to decrease winter severity at high latitudes, resulting in reduced days of snow cover. Several mammalian and avian species in the northern hemisphere express a seasonal colour coat (SCC) making them white in winter periods and brown or dark in summer. READ MORE

  5. 4. Sustainable and cost-efficient feed ingredients for optimum breeding of house crickets (Acheta domesticus) for human consumption in Thailand

    University essay from SLU/Department of Molecular Sciences

    Author : Lina von Hackewitz; [2020]
    Keywords : acheta domesticus; house cricket; farming; feed; feed alternatives; chicken feed; growth; by-product;

    Abstract : The world population is expected to increase over the next 30 years. The global food production system is under pressure to keep up with the growing demand . In the last years, increased attention has been paid to use livestock with lower environmental impact, like the house cricket Acheta domesticus. READ MORE

  6. 5. Downstream migration and survival of Atlantic salmon (Salmo salar L.) kelts and fallbacks when passing a hydropower plant

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

    Author : Frans Byström; [2020]
    Keywords : migration; kelt; iteroparous; anthropogenic obstacle; survival; turbine passage;

    Abstract : Repeat spawners of Atlantic salmon may be of great importance for population stability, the return spawners can significantly contribute to recruitment of juveniles. To have a significant proportion of repeat spawners in the population, it is necessary that salmons can successfully migrate back to the sea after spawning upriver. READ MORE