Hydroacoustic observations of surface shoaling behaviour of young-of-the-year perch Perca fluviatilis (Linnaeus, 1758) with a towed upward-facing transducer

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2009
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Probst, Wolfgang Nikolaus
Thomas, Gregor
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Zusammenfassung

The near-surface distribution of young-of-the-year perch was observed with a towed upward beaming echosounder system (SIMRAD EK60 with a circular 7◦ transducer). Perch aggregated densely in the epilimnion during daytime and dispersed evenly below the surface at night. Shoaling commenced in late June when perch metamorphosed from the larval to juvenile stage. Average shoal width was 6.6 m and average shoal height was 2.35 m in July, when perch were observed for the last time in the pelagic zone of Lake Constance.
Upward echosounding revealed the presence and near-surface distribution of pelagic juvenile perch and therefore this method can be used as a complementary survey tool to get more precise information about the distribution, behaviour and abundance of near-surface fish.

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570 Biowissenschaften, Biologie
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Echosounding, School, Depth distribution, Pelagic zone, Lake Constance
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ISO 690PROBST, Wolfgang Nikolaus, Gregor THOMAS, Reiner ECKMANN, 2009. Hydroacoustic observations of surface shoaling behaviour of young-of-the-year perch Perca fluviatilis (Linnaeus, 1758) with a towed upward-facing transducer. In: Fisheries Research. 2009, 96(2-3), pp. 133-138. ISSN 0165-7836. Available under: doi: 10.1016/j.fishres.2008.10.009
BibTex
@article{Probst2009Hydro-7919,
  year={2009},
  doi={10.1016/j.fishres.2008.10.009},
  title={Hydroacoustic observations of surface shoaling behaviour of young-of-the-year perch Perca fluviatilis (Linnaeus, 1758) with a towed upward-facing transducer},
  number={2-3},
  volume={96},
  issn={0165-7836},
  journal={Fisheries Research},
  pages={133--138},
  author={Probst, Wolfgang Nikolaus and Thomas, Gregor and Eckmann, Reiner}
}
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    <dcterms:abstract xml:lang="eng">The near-surface distribution of young-of-the-year perch was observed with a towed upward beaming echosounder system (SIMRAD EK60 with a circular 7◦ transducer). Perch aggregated densely in the epilimnion during daytime and dispersed evenly below the surface at night. Shoaling commenced in late June when perch metamorphosed from the larval to juvenile stage. Average shoal width was 6.6 m and average shoal height was 2.35 m in July, when perch were observed for the last time in the pelagic zone of Lake Constance.&lt;br /&gt;Upward echosounding revealed the presence and near-surface distribution of pelagic juvenile perch and therefore this method can be used as a complementary survey tool to get more precise information about the distribution, behaviour and abundance of near-surface fish.</dcterms:abstract>
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