Finding the needle in the haystack: Comparing sampling methods for detecting an endangered freshwater fish

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    Abstract

    Accurately detecting the presence or absence of threatened species is vital for threatened species management, and the detection power of individual sampling methods can vary significantly between species and life stages. The present study compares the detection power of six sampling methods in sampling the endangered Macquarie perch in riverine habitats in south-eastern Australia. In an initial survey in 1998 and 1999, fyke nets captured Macquarie perch at 100% of sites where the species was detected; gill-nets captured the species at 86%; with no other method having >50% detection efficiency. Most Macquarie perch were captured by fyke nets (90% in 1998 and 94% in 1999), followed by gill-nets (7 and 2%). A monitoring program at one of the survey sites over 7 years returned similar results with fyke nets detecting the species in all years. Fyke nets captured primarily young-of-year (YOY) individuals, whereas gill-nets captured adults and subadults. Boat electrofishing returned a high level of false negatives for Macquarie perch. Future sampling for this species should employ fyke and gill-nets to adequately characterise population structure (adults, juveniles, YOY), minimise false negatives and detect the occurrence of successful breeding the previous year.
    Original languageEnglish
    Pages (from-to)1740-1749
    Number of pages10
    JournalMarine and Freshwater Research
    Volume67
    Issue number11
    DOIs
    Publication statusPublished - 2016

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    Macquaria australasica
    freshwater fish
    gillnets
    sampling
    fish
    threatened species
    riverine habitat
    methodology
    boats
    electrofishing
    population structure
    fyke nets
    method
    monitoring
    breeding
    habitat

    Cite this

    @article{553a01ad165b45ffa503daf0f29de212,
    title = "Finding the needle in the haystack: Comparing sampling methods for detecting an endangered freshwater fish",
    abstract = "Accurately detecting the presence or absence of threatened species is vital for threatened species management, and the detection power of individual sampling methods can vary significantly between species and life stages. The present study compares the detection power of six sampling methods in sampling the endangered Macquarie perch in riverine habitats in south-eastern Australia. In an initial survey in 1998 and 1999, fyke nets captured Macquarie perch at 100{\%} of sites where the species was detected; gill-nets captured the species at 86{\%}; with no other method having >50{\%} detection efficiency. Most Macquarie perch were captured by fyke nets (90{\%} in 1998 and 94{\%} in 1999), followed by gill-nets (7 and 2{\%}). A monitoring program at one of the survey sites over 7 years returned similar results with fyke nets detecting the species in all years. Fyke nets captured primarily young-of-year (YOY) individuals, whereas gill-nets captured adults and subadults. Boat electrofishing returned a high level of false negatives for Macquarie perch. Future sampling for this species should employ fyke and gill-nets to adequately characterise population structure (adults, juveniles, YOY), minimise false negatives and detect the occurrence of successful breeding the previous year.",
    keywords = "electrofishing, false negative, fyke net, gill-net, Macquaria australasica, Macquarie perch, monitoring, threatened",
    author = "Mark LINTERMANS",
    year = "2016",
    doi = "10.1071/MF14346",
    language = "English",
    volume = "67",
    pages = "1740--1749",
    journal = "Marine Freshwater Research",
    issn = "0067-1940",
    publisher = "CSIRO",
    number = "11",

    }

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    T1 - Finding the needle in the haystack: Comparing sampling methods for detecting an endangered freshwater fish

    AU - LINTERMANS, Mark

    PY - 2016

    Y1 - 2016

    N2 - Accurately detecting the presence or absence of threatened species is vital for threatened species management, and the detection power of individual sampling methods can vary significantly between species and life stages. The present study compares the detection power of six sampling methods in sampling the endangered Macquarie perch in riverine habitats in south-eastern Australia. In an initial survey in 1998 and 1999, fyke nets captured Macquarie perch at 100% of sites where the species was detected; gill-nets captured the species at 86%; with no other method having >50% detection efficiency. Most Macquarie perch were captured by fyke nets (90% in 1998 and 94% in 1999), followed by gill-nets (7 and 2%). A monitoring program at one of the survey sites over 7 years returned similar results with fyke nets detecting the species in all years. Fyke nets captured primarily young-of-year (YOY) individuals, whereas gill-nets captured adults and subadults. Boat electrofishing returned a high level of false negatives for Macquarie perch. Future sampling for this species should employ fyke and gill-nets to adequately characterise population structure (adults, juveniles, YOY), minimise false negatives and detect the occurrence of successful breeding the previous year.

    AB - Accurately detecting the presence or absence of threatened species is vital for threatened species management, and the detection power of individual sampling methods can vary significantly between species and life stages. The present study compares the detection power of six sampling methods in sampling the endangered Macquarie perch in riverine habitats in south-eastern Australia. In an initial survey in 1998 and 1999, fyke nets captured Macquarie perch at 100% of sites where the species was detected; gill-nets captured the species at 86%; with no other method having >50% detection efficiency. Most Macquarie perch were captured by fyke nets (90% in 1998 and 94% in 1999), followed by gill-nets (7 and 2%). A monitoring program at one of the survey sites over 7 years returned similar results with fyke nets detecting the species in all years. Fyke nets captured primarily young-of-year (YOY) individuals, whereas gill-nets captured adults and subadults. Boat electrofishing returned a high level of false negatives for Macquarie perch. Future sampling for this species should employ fyke and gill-nets to adequately characterise population structure (adults, juveniles, YOY), minimise false negatives and detect the occurrence of successful breeding the previous year.

    KW - electrofishing

    KW - false negative

    KW - fyke net

    KW - gill-net

    KW - Macquaria australasica

    KW - Macquarie perch

    KW - monitoring

    KW - threatened

    U2 - 10.1071/MF14346

    DO - 10.1071/MF14346

    M3 - Article

    VL - 67

    SP - 1740

    EP - 1749

    JO - Marine Freshwater Research

    JF - Marine Freshwater Research

    SN - 0067-1940

    IS - 11

    ER -