Small scale distribution patterns and vertical migration of North Sea herring larvae (<i>Clupea harengus</i>, Teleostei: Clupeidea) in relation to abiotic and biotic factors

  • Haslob H
  • Rohlf N
  • Schnack D
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Abstract

The distribution of herring larvae in relation to environmental conditions and the occurrence of possible prey and predator organisms was studied during a 4-day period on a permanent station in the northern North Sea in September 1999. The vertical distribution of herring larvae was sampled in 20-m intervals by means of a multiple-closing net. To resolve the small-scale patchiness of herring larvae and planktonic prey and predator organisms, a towed in-situ video system was used, the Ichthyoplankton Recorder. A diel vertical migration of herring larvae was observed with different intensities depending on their body length. Small larvae ({\ensuremath{<}}10 mm) were concentrated in the upper water layers during daytime and were distributed more homogenously during night time. Large larvae ({\ensuremath{>}}16 mm) showed the highest abundances in the upper water layers during the day and were concentrated in deeper water layers during the night. The presented results appear to be relevant for individual-based modelling of the fate of larval herring populations. La distribuci{ó}n a peque{ñ}a escala y la migraci{ó}n vertical de larvas de arenque del Mar del Norte (Clupea harengus, Teleostei: Clupeidea) en relaci{ó}n con factores abi{ó}ticos y bi{ó}ticos. ? Se han estudiado la distribuci{ó}n de las larvas de arenque en relaci{ó}n a las condiciones ambientales y la incidencia de posibles presas y organismos depredadores a lo largo de un periodo de 4 d{í}as en una estaci{ó}n permanente situada en el Mar del Norte en septiembre de 1999. La distribuci{ó}n vertical de las larvas de arenque fue muestreada en intervalos de 20 m mediante una red de apertura m{ú}ltiple (multiple opening/closing net). Para determinar a peque{ñ}a escala la heterogeneidad en la distribuci{ó}n de las larvas de arenque, as{í} como de las presas y depredadores planct{ó}nicos, se utiliz{ó} un sistema de v{í}deo in-situ (The Ichthyoplankton Recorder). Se observ{ó} una migraci{ó}n vertical nictimeral con diferentes intensidades dependiendo de la longitud corporal de las larvas. Las larvas peque{ñ}as ({\ensuremath{<}}10 mm) se concentraban en las capas superiores de la columna de agua durante el d{í}a y se distribu{í}an m{á}s homog{é}neamente durante la noche. Las larvas m{á}s grandes ({\ensuremath{>}}16 mm) mostraban su mayor abundancia en las capas superiores de la columna de agua durante el d{í}a y se concentraban en capas de agua m{á}s profundas durante la noche. Los resultados presentados en este trabajo pueden ser relevantes para la modelizaci{ó}n (individual based modeling) del destino de las poblaciones de larvas del arenque.

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APA

Haslob, H., Rohlf, N., & Schnack, D. (2009). Small scale distribution patterns and vertical migration of North Sea herring larvae (Clupea harengus, Teleostei: Clupeidea) in relation to abiotic and biotic factors. Scientia Marina, 73(S1), 13–22. https://doi.org/10.3989/scimar.2009.73s1013

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