An accurate tool for ageing Two-spined Blackfish for use in determining timing of spawning in upland streams in the Brindabella ranges, ACT, Australia

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    Abstract

    To manage populations of threatened fish species in modified habitats and regulated rivers requires an understanding of their reproductive biology and spawning cues. In particular, accurate information about early life stages in these species can be used to facilitate programmes that maximise recruitment and breeding success. This study aimed to develop methods to accurately age early juvenile freshwater native fish, Two-spined Blackfish, (Gadopsis bispinosus), to allow the determination of spawning date. This was accomplished through the examination of otolith microstructure in early juveniles. The age at which the first ring was deposited and the relationship between days and number of rings were determined using both field and aquarium trials. Field trials of marked juvenile otoliths revealed daily deposition of rings (1.02 ± 0.02 rings per day for fish sacrificed six days postmarking). The strength of this relationship lessened slightly as juveniles aged (0.92 ± 0.02 rings per day for fish sacrificed 13 days postmarking). The first otolith ring was deposited 7.50 ± 1.09 days after spawning. The enumeration of daily rings combined with knowledge of the commencement of ring deposition enabled accurate estimation of spawning date. The current study is the first to examine otolith microstructure in juvenile Two-spined Blackfish allowing accurate determination of spawning date. While more research is required to accurately age older juveniles, this technique has the potential to precisely correlate spawning with environmental cues, facilitating better management of temperature and flow during breeding periods, potentially increasing spawning and recruitment of this endangered species.
    Original languageEnglish
    Pages (from-to)70-80
    Number of pages11
    JournalEcological Management and Restoration
    Volume17
    Issue number1
    DOIs
    Publication statusPublished - 2016

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    highlands
    spawning
    otolith
    otoliths
    fish
    microstructure
    environmental cue
    breeding
    reproductive biology
    aquarium
    aquariums
    endangered species
    reproductive success
    field experimentation
    Biological Sciences
    rivers
    habitat
    habitats
    methodology
    river

    Cite this

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    title = "An accurate tool for ageing Two-spined Blackfish for use in determining timing of spawning in upland streams in the Brindabella ranges, ACT, Australia",
    abstract = "To manage populations of threatened fish species in modified habitats and regulated rivers requires an understanding of their reproductive biology and spawning cues. In particular, accurate information about early life stages in these species can be used to facilitate programmes that maximise recruitment and breeding success. This study aimed to develop methods to accurately age early juvenile freshwater native fish, Two-spined Blackfish, (Gadopsis bispinosus), to allow the determination of spawning date. This was accomplished through the examination of otolith microstructure in early juveniles. The age at which the first ring was deposited and the relationship between days and number of rings were determined using both field and aquarium trials. Field trials of marked juvenile otoliths revealed daily deposition of rings (1.02 ± 0.02 rings per day for fish sacrificed six days postmarking). The strength of this relationship lessened slightly as juveniles aged (0.92 ± 0.02 rings per day for fish sacrificed 13 days postmarking). The first otolith ring was deposited 7.50 ± 1.09 days after spawning. The enumeration of daily rings combined with knowledge of the commencement of ring deposition enabled accurate estimation of spawning date. The current study is the first to examine otolith microstructure in juvenile Two-spined Blackfish allowing accurate determination of spawning date. While more research is required to accurately age older juveniles, this technique has the potential to precisely correlate spawning with environmental cues, facilitating better management of temperature and flow during breeding periods, potentially increasing spawning and recruitment of this endangered species.",
    keywords = "Fish, Freshwater wetland, Populations and communities, Techniques and methodology, Threatened species, Wetlands",
    author = "Ben BROADHURST and Mark LINTERMANS",
    year = "2016",
    doi = "10.1111/emr.12191",
    language = "English",
    volume = "17",
    pages = "70--80",
    journal = "Ecological Management and Restoration",
    issn = "1442-7001",
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    TY - JOUR

    T1 - An accurate tool for ageing Two-spined Blackfish for use in determining timing of spawning in upland streams in the Brindabella ranges, ACT, Australia

    AU - BROADHURST, Ben

    AU - LINTERMANS, Mark

    PY - 2016

    Y1 - 2016

    N2 - To manage populations of threatened fish species in modified habitats and regulated rivers requires an understanding of their reproductive biology and spawning cues. In particular, accurate information about early life stages in these species can be used to facilitate programmes that maximise recruitment and breeding success. This study aimed to develop methods to accurately age early juvenile freshwater native fish, Two-spined Blackfish, (Gadopsis bispinosus), to allow the determination of spawning date. This was accomplished through the examination of otolith microstructure in early juveniles. The age at which the first ring was deposited and the relationship between days and number of rings were determined using both field and aquarium trials. Field trials of marked juvenile otoliths revealed daily deposition of rings (1.02 ± 0.02 rings per day for fish sacrificed six days postmarking). The strength of this relationship lessened slightly as juveniles aged (0.92 ± 0.02 rings per day for fish sacrificed 13 days postmarking). The first otolith ring was deposited 7.50 ± 1.09 days after spawning. The enumeration of daily rings combined with knowledge of the commencement of ring deposition enabled accurate estimation of spawning date. The current study is the first to examine otolith microstructure in juvenile Two-spined Blackfish allowing accurate determination of spawning date. While more research is required to accurately age older juveniles, this technique has the potential to precisely correlate spawning with environmental cues, facilitating better management of temperature and flow during breeding periods, potentially increasing spawning and recruitment of this endangered species.

    AB - To manage populations of threatened fish species in modified habitats and regulated rivers requires an understanding of their reproductive biology and spawning cues. In particular, accurate information about early life stages in these species can be used to facilitate programmes that maximise recruitment and breeding success. This study aimed to develop methods to accurately age early juvenile freshwater native fish, Two-spined Blackfish, (Gadopsis bispinosus), to allow the determination of spawning date. This was accomplished through the examination of otolith microstructure in early juveniles. The age at which the first ring was deposited and the relationship between days and number of rings were determined using both field and aquarium trials. Field trials of marked juvenile otoliths revealed daily deposition of rings (1.02 ± 0.02 rings per day for fish sacrificed six days postmarking). The strength of this relationship lessened slightly as juveniles aged (0.92 ± 0.02 rings per day for fish sacrificed 13 days postmarking). The first otolith ring was deposited 7.50 ± 1.09 days after spawning. The enumeration of daily rings combined with knowledge of the commencement of ring deposition enabled accurate estimation of spawning date. The current study is the first to examine otolith microstructure in juvenile Two-spined Blackfish allowing accurate determination of spawning date. While more research is required to accurately age older juveniles, this technique has the potential to precisely correlate spawning with environmental cues, facilitating better management of temperature and flow during breeding periods, potentially increasing spawning and recruitment of this endangered species.

    KW - Fish

    KW - Freshwater wetland

    KW - Populations and communities

    KW - Techniques and methodology

    KW - Threatened species

    KW - Wetlands

    UR - http://www.scopus.com/inward/record.url?scp=84956824476&partnerID=8YFLogxK

    UR - http://www.mendeley.com/research/accurate-tool-ageing-twospined-blackfish-determining-timing-spawning-upland-streams-brindabella-rang

    U2 - 10.1111/emr.12191

    DO - 10.1111/emr.12191

    M3 - Article

    VL - 17

    SP - 70

    EP - 80

    JO - Ecological Management and Restoration

    JF - Ecological Management and Restoration

    SN - 1442-7001

    IS - 1

    ER -