• Login
    View Item 
    •   Marine Institute Open Access Repository
    • Marine Institute Community of Research Publications
    • Irish Fisheries Investigations
    • Irish Fisheries Investigations Series B - Marine
    • View Item
    •   Marine Institute Open Access Repository
    • Marine Institute Community of Research Publications
    • Irish Fisheries Investigations
    • Irish Fisheries Investigations Series B - Marine
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Marine OARCommunitiesPublication DateAuthorsTitlesSubjectsThis CollectionPublication DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Statistics

    Display statistics

    Size Distribution and Food of Thornback Rays (Raja clavata L) Caught on Rod and Line on the Mayo Coast

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    No 11 1974 Size selection and ...
    Size:
    610.3Kb
    Format:
    PDF
    Download
    Author
    Fitzmaurice, P
    Keyword
    Size Distribution
    Food
    Thornback Rays
    (Raja clavata L
    Rod and Line
    Mayo Coast
    Date
    1974
    Publisher
    Department of Agriculture and Fisheries (Fisheries Division)
    
    Metadata
    Show full item record
    Abstract
    A total of 732 Thornback Rays (R. clavata) were examined for length, wingspan, weight, sex and food in two bays on the west coast of Ireland. The samples were taken by rod and line during angling festivals in Clew Bay in June 1971 and in Broadhaven Bay in September 1971. The length/wingspan relationship for both sexes in both areas was found to be linear and the wingspan/weight relationship was the same for both sexes. The males become mature between 15.0 and 17.0 inches (38 to 43 cm) wingspan, while the females become mature between 18.0 and 20.0 inches (45.5 to 50.5 cm) wingspan. The sex ratio of males to females in each of the two samples was 1:1 in Clew Bay and 1.4:1 in Broadhaven Bay. The main food items in the stomachs of the rays from Clew Bay were Macropipus spp. (44 per cent), Crangon (23 per cent), Carcinus (21 per cent) and Lamellibranchs (10 per cent). In Broadhavcn Bay Ammodytidae (21.5 per cent), other fishes (19.5 per cent) and Macropipus spp. (14 per cent) formed the bulk of food items. A total of 71 R. clavata were tagged in Broadhaven Bay in the summer of 1971 and to date there have been 8 recaptures 7 within Broadhaven Bay. The days at liberty varied from 0 to 775 and the greatest distance travelled was 14 miles.
    URI
    http://hdl.handle.net/10793/139
    Citation
    Fitzmaurice, P., "Size Distribution and Food of Thornback Rays (Raja clavata L) Caught on Rod and Line on the Mayo Coast", Irish Fisheries Investigations Series B, Department of Agriculture and Fisheries (Fisheries Division) 1974
    Collections
    Irish Fisheries Investigations Series B - Marine

    entitlement

     
    DSpace software (copyright © 2002 - 2022)  DuraSpace
    Quick Guide | Contact Us | MI Privacy Policy
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.