• Login
    View Item 
    •   Home
    • University of Alaska Fairbanks
    • UAF Graduate School
    • New theses and dissertations
    • View Item
    •   Home
    • University of Alaska Fairbanks
    • UAF Graduate School
    • New theses and dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Scholarworks@UACommunitiesPublication DateAuthorsTitlesSubjectsTypeThis CollectionPublication DateAuthorsTitlesSubjectsType

    My Account

    Login

    First Time Submitters, Register Here

    Register

    Statistics

    Display statistics

    A nonlethal, whole oocyte approach to determining spawn readiness in Pacific sand lance, Ammodytes personatus, in Southeastern Alaska

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Neff_A_2021.pdf
    Size:
    4.390Mb
    Format:
    PDF
    Download
    Author
    Neff, A. Darcie
    Chair
    Norcross, Brenda L.
    Committee
    López, J. Andrés
    Keyword
    Pacific sand lance
    Spawning
    Southeast Alaska
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/12627
    Abstract
    Knowing when a fish spawns is fundamental to understanding and sustainably managing it. The annual reproductive cycle of the iteroparous, total-spawning sand lances and sandeels (Ammodytidae) has been described almost exclusively using gonadal macroscopy and gonadosomatic indices (GSI), with little attention to gamete changes indicative of imminent ovulation and spawning. The latter was the focus of this study, in which spawn readiness of a southeastern Alaska population of Pacific sand lance (Ammodytes personatus) with unknown spawning phenology was assessed using light microscopy of whole oocytes. Oocytes were cannulated from spawning-capable females age-3 to age-9, measured for diameter, and classified into five developmental stages based on the coalescence of lipids and the position and integrity of the germinal vesicle. Oocyte maturation lasted 5-6 weeks, as determined by weekly cannulation of captive females. Diameter and developmental stage of oocytes were more precise metrics of readiness to spawn than macroscopy or GSI and indicated spawning in early- to mid-December. The examination of nonlethally collected whole oocytes is a quick, easy, and low-cost approach to the accurate and reliable assessment of spawn readiness in Pacific sand lance and offers the potential of success with congenerics and other total-spawning fish species.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2021
    Date
    2021-08
    Type
    Thesis
    Collections
    New theses and dissertations

    entitlement

     
    ABOUT US|HELP|BROWSE|ADVANCED SEARCH

    The University of Alaska Fairbanks is an affirmative action/equal opportunity employer and educational institution and is a part of the University of Alaska system.

    ©UAF 2013 - 2022 | Questions? ua-scholarworks@alaska.edu | Last modified: September 25, 2019

    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.