Essays about: "vanlig tumlare"

Found 4 essays containing the words vanlig tumlare.

  1. 1. Pearls as bycatch mitigation strategy for Harbour porpoise (Phoecena phoecena)

    University essay from SLU/Dept. Of Aquatic Resources

    Author : Sara Gustafsson; [2020]
    Keywords : harbour porpoise; bycatch mitigation; acoustic reflector; pearl; gillnet; F-POD; click rate; click behaviour; inter-click-interval; terminal buzz; diel phase; GAM;

    Abstract : One of the major threats to harbour porpoise population sustainability is thought to be the high incidence of bycatch specifically in gillnets. This study aims to examine the use of acrylic class pearls developed in an earlier study as acoustic reflectors on gillnets in an effort to increase their visibility to echolocating harbour porpoises in the lumpsucker fishery in Kattegatt. READ MORE

  3. 2. Harbour Porpoise Click Train Classification with LSTM Recurrent Neural Networks

    University essay from KTH/Teknisk informationsvetenskap

    Author : Filip Ärlemalm; [2017]
    Keywords : ;

    Abstract : The harbour porpoise is a toothed whale whose presence is threatened in Scandinavia. Onestep towards preserving the species in critical areas is to study and observe the harbourporpoise population growth or decline in these areas. Today this is done by using underwateraudio recorders, so called hydrophones, and manual analyzing tools. READ MORE

  4. 3. Harbour porpoise (Phocoena phocoena) predation on cod (Gadus morhua) in the Kattegat : a review of current knowledge and implications for stock assessments

    University essay from SLU/Dept. Of Aquatic Resources

    Author : Adam Wallin; [2017]
    Keywords : Atlantic cod; diet; Gadus morhua; harbour porpoise; Kattegat; Phocoena phocoena; prey;

    Abstract : Kattegat is an area between Denmark and Sweden that connects the Atlantic Ocean to the Baltic Sea. It has long been an important source for fishery of cod (Gadus morhua). READ MORE

  5. 4. Spatial och temporal förändring i närvaro av vanlig tumlare (Phocoena phocoena) vid fiske med pingers i Skälderviken och Kullaberg

    University essay from SLU/Dept. Of Aquatic Resources

    Author : Emma Mattsson; [2017]
    Keywords : vanlig tumlare; Phocoena phocoena; fiske; pingers; C-POD; bifångst;

    Abstract : Ett av de större hoten mot vanlig tumlare (Phocoena phocoena) är bifångst i samband med fiske. På grund av detta har effekten av akustiska kapslar (pingers) på fiskenät undersökts i flera studier för att avgöra om bifångsten av tumlare kan minimeras. READ MORE