Essays about: "yngel"

Found 5 essays containing the word yngel.

  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. 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. Nuptial coloration is unaffected by the immune response fibrosis in threespine stickleback

    University essay from Lunds universitet/Examensarbeten i biologi

    Author : Siri Stigeborn; [2021]
    Keywords : Biology and Life Sciences;

    Abstract : To understand why immune traits affect the fitness of its host is an important part of understanding why and how immune responses evolve. In threespine stickleback (Gasterosteus aculeatus), fibrosis is an immune response evolved to combat infection of the tapeworm parasite Schistocephalus solidus. READ MORE

  5. 4. Veterinary antiparasitic pharmaceuticals – effects on behaviour in fish larvae

    University essay from SLU/Dept. of Biomedical Sciences and Veterinary Public Health

    Author : Maria Blomberg; [2017]
    Keywords : fish; ; behaviour; ; antiparasitic; fisk; ; beteende; ; antiparasitära;

    Abstract : SUMMARY Antiparasitic pharmaceuticals are important groups of pharmaceuticals in veterinary medicine and are used in large quantities. Antiparasitic pharmaceuticals and their metabolites enter the environment via excretion in urine and/or faeces from treated animals and by run off to surface water these compounds reach aquatic environments and thereby present a risk for aquatic organisms. READ MORE

  6. 5. Influence of the habitat on the potential for cannibalism and population dynamics in stream-dwelling European grayling (Thymallus thymallus L.)

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

    Author : Carl-Johan Lindström; [2010]
    Keywords : cannibalism; European grayling; Thymallus thymallus; habitat mapping; Jämtland; population dynamics; recruitment; size structured population model; stream environment;

    Abstract : Cannibalism can have major influence on fish population dynamics. A prerequisite for cannibalism is that the cannibal and the potential victim meet, and besides density effects, the encounter rate between cannibals and their victims is therefore also largely dependent on habitat use and habitat heterogeneity. READ MORE