Essays about: "northern pike"

Showing result 6 - 10 of 18 essays containing the words northern pike.

  1. 6. Automatic identification of northern pike (Exos Lucius) with convolutional neural networks

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Axel Lavenius; [2020]
    Keywords : Northern pike; Esox Lucius; population monitoring; Convolutional Neural Network; CNN; VGG-network; semantic segmentation; image classification; pattern recognition; Gädda; Esox Lucius; populationsmätning; faltande neuralt nätverk; CNN; VGG-nätverk; semantisk segmentering; bildigenkänning; mönsterigenkänning;

    Abstract : The population of northern pike in the Baltic sea has seen a drasticdecrease in numbers in the last couple of decades. The reasons for this are believed to be many, but the majority of them are most likely anthropogenic. READ MORE

  3. 7. Creating an Application for Crowdsourcing the Data Collection of Northern Pike

    University essay from Uppsala universitet/Institutionen för informationsteknologi

    Author : Filip Hultgren; Christopher Rydell; Max Rylander; [2019]
    Keywords : ;

    Abstract : Northern pike (Esox Lucius) serves an important role in the ecosystem of the Baltic sea, and is therefore commonly used as a model species for studying the entire ecosystem. Photographic mark-recapture is a method for studying animal populations through the tracking of individual animals based on photographs of distinctive markings on their bodies. READ MORE

  4. 8. Increased body growth rates of northern pike (Esox lucius) in the Baltic Sea : importance of size-selective mortality and warming waters

    University essay from SLU/Dept. Of Aquatic Resources

    Author : Terese Berggren; [2019]
    Keywords : Northern pike; Esox lucius; Back-calculated length; Body growth; Size-selective mortality; Warming waters; Baltic Sea;

    Abstract : The northern pike, Esox lucius Linnaeus (1758), is a highly valuable species in recreational fishing, and plays a vital role as a keystone predator in the structuring of fish communities in temperate lakes and brackish waters. Ma-jor declines of pike in the Baltic Sea have been recorded, particular of larger pikes, which may have cascading effects on abundances of lower ecosys-tem compartments. READ MORE

  5. 9. The influence of northern pike on the diet of Eurasian perch

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

    Author : Karlberg Ylva; [2017]
    Keywords : Perca fluviatilis; Esox lucius; Coregonus lavaretus; trophic interactions; facilitation; Eurasian perch; northern pike; whitefish; Perca fluviatilis; Esox lucius; Coregonus lavaretus; trofiska interaktioner; facilitering; abborre; gädda; sik;

    Abstract : Top predators in aquatic ecosystems often have strong top-down effects on the ecosystem. Northern pike (Esox lucius) has been documented to cause whitefish (Coregonus lavaretus) populations to diverge into different ecomorphs. READ MORE

  6. 10. Northern pike Esox lucius growth rates in sub populations of freshwater and sea water origins in the Baltic Sea : Otolith method approach

    University essay from Linnéuniversitetet/Institutionen för biologi och miljö (BOM)

    Author : Nelson Mbawala; [2016]
    Keywords : Esox lucius; otolith; polishing; staining; core; annuli; growth rate and age;

    Abstract : Northern pike or pike Esox lucius is total piscivorous fish species found in the brackish and freshwater ecosystems of the Northern hemisphere. It is a top predator and keystone species that causes cascading effects in these ecosystems. Otoliths have been used to estimate age and growth rates in most fishes. READ MORE