Downstream spawning migration by the amphidromous Australian grayling (Prototroctes maraena) in a coastal river in south-eastern Australia

Wayne Koster, David Dawson, David Crook

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Understanding the reasons and cues for migration is crucial for developing effective conservation and management strategies of diadromous fishes. Spawning and movement patterns of the threatened diadromous Australian grayling (Prototroctes maraena) were investigated in the Bunyip River, Victoria, using drift sampling (2008-2011) and acoustic telemetry (2009-2010) during the autumn-winter spawning period of each year. Fifty-five adult fish (2009: n=21; 2010: n=34) were tagged and released in February ?15-30km upstream of the Bunyip River estuary. Thirteen fish (2009: n=7; 2010: n=6) undertook rapid downstream migrations from March to April to reaches immediately upstream of the estuary. Drifting eggs were detected at multiple sites between April and July; however, the majority (78.8%) were collected in the lower reaches within ?0.5km of the estuary in early-mid-May. Tagged adult fish arrived in this area 1-4 weeks before eggs were detected and usually moved back upstream within 2 weeks following the peak egg abundance. Downstream migration and peak egg abundance were associated with increased river flows. Although the proportion of fish that undertook migrations was low, low rates of tag retention in this species likely account for the failure to detect migration by many of the tagged individuals.
    Original languageEnglish
    Pages (from-to)31-41
    Number of pages11
    JournalMarine and Freshwater Research
    Volume64
    Issue number1
    DOIs
    Publication statusPublished - 2013

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    fish roe
    South Australia
    Rivers
    Fishes
    spawning
    Estuaries
    rivers
    estuaries
    egg
    fish
    river
    estuary
    Victoria (Australia)
    Eggs
    diadromous fish
    Ovum
    telemetry
    Telemetry
    Victoria
    acoustics

    Cite this

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    title = "Downstream spawning migration by the amphidromous Australian grayling (Prototroctes maraena) in a coastal river in south-eastern Australia",
    abstract = "Understanding the reasons and cues for migration is crucial for developing effective conservation and management strategies of diadromous fishes. Spawning and movement patterns of the threatened diadromous Australian grayling (Prototroctes maraena) were investigated in the Bunyip River, Victoria, using drift sampling (2008-2011) and acoustic telemetry (2009-2010) during the autumn-winter spawning period of each year. Fifty-five adult fish (2009: n=21; 2010: n=34) were tagged and released in February ?15-30km upstream of the Bunyip River estuary. Thirteen fish (2009: n=7; 2010: n=6) undertook rapid downstream migrations from March to April to reaches immediately upstream of the estuary. Drifting eggs were detected at multiple sites between April and July; however, the majority (78.8{\%}) were collected in the lower reaches within ?0.5km of the estuary in early-mid-May. Tagged adult fish arrived in this area 1-4 weeks before eggs were detected and usually moved back upstream within 2 weeks following the peak egg abundance. Downstream migration and peak egg abundance were associated with increased river flows. Although the proportion of fish that undertook migrations was low, low rates of tag retention in this species likely account for the failure to detect migration by many of the tagged individuals.",
    keywords = "adult, coastal zone, estuarine organism, fishery management, freshwater ecosystem, migration, migratory behavior, movement, radiotelemetry, river water, sampling, spawning, spawning population, Australia, Pisces, Prototroctes maraena, Retropinnidae",
    author = "Wayne Koster and David Dawson and David Crook",
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    language = "English",
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    Downstream spawning migration by the amphidromous Australian grayling (Prototroctes maraena) in a coastal river in south-eastern Australia. / Koster, Wayne; Dawson, David; Crook, David.

    In: Marine and Freshwater Research, Vol. 64, No. 1, 2013, p. 31-41.

    Research output: Contribution to journalArticleResearchpeer-review

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    T1 - Downstream spawning migration by the amphidromous Australian grayling (Prototroctes maraena) in a coastal river in south-eastern Australia

    AU - Koster, Wayne

    AU - Dawson, David

    AU - Crook, David

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    N2 - Understanding the reasons and cues for migration is crucial for developing effective conservation and management strategies of diadromous fishes. Spawning and movement patterns of the threatened diadromous Australian grayling (Prototroctes maraena) were investigated in the Bunyip River, Victoria, using drift sampling (2008-2011) and acoustic telemetry (2009-2010) during the autumn-winter spawning period of each year. Fifty-five adult fish (2009: n=21; 2010: n=34) were tagged and released in February ?15-30km upstream of the Bunyip River estuary. Thirteen fish (2009: n=7; 2010: n=6) undertook rapid downstream migrations from March to April to reaches immediately upstream of the estuary. Drifting eggs were detected at multiple sites between April and July; however, the majority (78.8%) were collected in the lower reaches within ?0.5km of the estuary in early-mid-May. Tagged adult fish arrived in this area 1-4 weeks before eggs were detected and usually moved back upstream within 2 weeks following the peak egg abundance. Downstream migration and peak egg abundance were associated with increased river flows. Although the proportion of fish that undertook migrations was low, low rates of tag retention in this species likely account for the failure to detect migration by many of the tagged individuals.

    AB - Understanding the reasons and cues for migration is crucial for developing effective conservation and management strategies of diadromous fishes. Spawning and movement patterns of the threatened diadromous Australian grayling (Prototroctes maraena) were investigated in the Bunyip River, Victoria, using drift sampling (2008-2011) and acoustic telemetry (2009-2010) during the autumn-winter spawning period of each year. Fifty-five adult fish (2009: n=21; 2010: n=34) were tagged and released in February ?15-30km upstream of the Bunyip River estuary. Thirteen fish (2009: n=7; 2010: n=6) undertook rapid downstream migrations from March to April to reaches immediately upstream of the estuary. Drifting eggs were detected at multiple sites between April and July; however, the majority (78.8%) were collected in the lower reaches within ?0.5km of the estuary in early-mid-May. Tagged adult fish arrived in this area 1-4 weeks before eggs were detected and usually moved back upstream within 2 weeks following the peak egg abundance. Downstream migration and peak egg abundance were associated with increased river flows. Although the proportion of fish that undertook migrations was low, low rates of tag retention in this species likely account for the failure to detect migration by many of the tagged individuals.

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    KW - estuarine organism

    KW - fishery management

    KW - freshwater ecosystem

    KW - migration

    KW - migratory behavior

    KW - movement

    KW - radiotelemetry

    KW - river water

    KW - sampling

    KW - spawning

    KW - spawning population

    KW - Australia

    KW - Pisces

    KW - Prototroctes maraena

    KW - Retropinnidae

    UR - http://www.scopus.com/inward/record.url?scp=84873597523&partnerID=8YFLogxK

    U2 - 10.1071/MF12196

    DO - 10.1071/MF12196

    M3 - Article

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    SP - 31

    EP - 41

    JO - Marine & Freshwater Research

    JF - Marine & Freshwater Research

    SN - 0067-1940

    IS - 1

    ER -