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Hydroacoustic target strength vs. fish length revisited: Data of caged, free-swimming European whitefish (Coregonus lavaretus L.) suggest a bi-phasic linear relationship under a limited range of tilt angles

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F20%3A00538913" target="_blank" >RIV/60077344:_____/20:00538913 - isvavai.cz</a>

  • Result on the web

    <a href="https://doi.org/10.1016/j.fishres.2020.105620" target="_blank" >https://doi.org/10.1016/j.fishres.2020.105620</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.fishres.2020.105620" target="_blank" >10.1016/j.fishres.2020.105620</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Hydroacoustic target strength vs. fish length revisited: Data of caged, free-swimming European whitefish (Coregonus lavaretus L.) suggest a bi-phasic linear relationship under a limited range of tilt angles

  • Original language description

    To develop specific target strength (TS) fish length relationships using 38 kHz and 120 kHz split beam echosounders, we measured TS (dB) in five size groups (5-59 cm total length) of European whitefish (Coregonus lavaretus) swimming freely in a net cage of 4m diameter and 8m height. For 120 kHz, we deployed down-looking (dorsal aspect) as well as upwards-looking (ventral aspect) transducers, whereas 38 kHz measurements were taken for the dorsal aspect only. The ventral aspect dataset revealed stronger TS values especially for the larger length classes. The dorsal aspect datasets of both frequencies were not significantly different across all lengths and both showed a steep increase of the relationship in small sizes (5-20 cm) which levelled off in the larger sizes (> 20 cm). For 120 kHz the slope of a linear regression of TS vs. log fish length was 29.8 for fish between 5-20 cm (much higher than the generally proposed slope of 20), while in fish > 20 cm the slope was 10.7 which is far below the generally proposed value. We advocate considering a potential bi-phasic linear regression of the log length TS relationship for all species whenever a large size range of fish is studied, encompassing significant proportions below and above approximately 20 cm total length.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10618 - Ecology

Result continuities

  • Project

    <a href="/en/project/GAP504%2F12%2F1186" target="_blank" >GAP504/12/1186: Hydroacoustical distinguishing between fish and bubbles, and quantification of methane bubble ebullition in freshwater reservoirs of temperate zone</a><br>

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2020

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Fisheries Research

  • ISSN

    0165-7836

  • e-ISSN

  • Volume of the periodical

    229

  • Issue of the periodical within the volume

    5

  • Country of publishing house

    NL - THE KINGDOM OF THE NETHERLANDS

  • Number of pages

    10

  • Pages from-to

    1-10

  • UT code for WoS article

    000539099200024

  • EID of the result in the Scopus database

    2-s2.0-85085351653