Essays about: "parr"

Showing result 11 - 15 of 15 essays containing the word parr.

  1. 11. Enumerating Atlantic salmon smolt production in River Vindelälven based on habitat availability and parr densities : consequences of using different density estimation methods

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

    Author : Stefan Ågren; [2010]
    Keywords : Salmo salar L.; Mapping; Juvenile nursery areas; Electrofishing abundance; Flow correlation; Population model;

    Abstract : Habitat mapping was conducted in the main stem of River Vindelälven in the autumn of 2009 along the salmon distribution area. The aim was to estimate the quantity of potential reproduction areas, including spawning and juvenile rearing habitats. The mapping included 61 km of various stream sections along the river length of 269 km. READ MORE

  3. 12. Gene expression of the gonadotropin receptors and anti-Müllerian hormone in early maturing male Atlantic salmon parr, Salmo salar

    University essay from Karlstads universitet; Fakulteten för samhälls- och livsvetenskaper

    Author : Susanne Trombley; [2009]
    Keywords : Salmo salar; spermatogenesis; FSHR; LHR; AMH; puberty;

    Abstract : An up-regulation of gene expression of the gonadotropin receptors FSHR and LHR, and a down-regulation of anti-Müllerian hormone (AMH), in the gonads of early maturing male Atlantic salmon parr (Salmo salar) have been shown to take place during the process of sexual maturation. It has however not been determined if this happens prior to or after the onset of spermatogenesis. READ MORE

  4. 13. Linking habitat characteristics and juvenile density to quantify Salmo salar & Salmo trutta smolt production in River Sävarån, Northern Sweden

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

    Author : Johan Molin; [2008]
    Keywords : mapping; flow; substratum; electro-fishing; parr; radio-telemetry; spawning;

    Abstract : Even though the European Union has set up goals for rivers that support wild salmon to reach a production that is 50% of the MAXIMUM natural potential, there is a general lack of knowledge about the production capacity of salmonids in Sweden. To estimate the production of salmon and sea trout in the Sävarån river, I combined habitat mapping with available electro-fishing data. READ MORE

  5. 14. Survival of Atlantic salmon (Salmo salar L.) and brown trout (Salmo trutta L.) exposed to episodic acidification during spring flood

    University essay from SLU/Dept. of Forest Ecology and Management

    Author : Ignacio Serrano; [2005]
    Keywords : trout; salmon; salmo; acidification; pH;

    Abstract : Överlevnaden av lax (Salmo salar) och öring (Salmo trutta) under tillfälliga pH-sänkningar under snösmältningen studerades i tio vattendrag i norra Sverige. Olika hydrologiska parametrar mättes kontinuerligt och vattenprover för laboratorieanalys insamlades under försöksperioden. READ MORE

  6. 15. Smärtlindring i samband med vaccination av fisk

    University essay from SLU/Dept. of Anatomy, Physiology and Biochemistry

    Author : Charlotte Axén; [2003]
    Keywords : fisk; analgesi; vaccination;

    Abstract : Vaccination of fish can be assumed to cause pain. This study was designed to see if we can minimize the suffering of fish following vaccination. Fishes are cold-blooded animals and thus more primitive than warm-blooded animals. Despite this, many organs, e. READ MORE