Reactions of herring schools to the sound field of a survey vessel

Misund, Ole Arve; Øvredal, Jan Tore; Hafsteinsson, Magnus Thor

doi:10.1051/alr:1996002

Cited by 22 publications

(10 citation statements)

References 5 publications

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“…It is less in the fore and aft directions, probably owing to screening by the hull and the wake, respectively (Urick 1967, p. 273). This feature is used to explain the horizontal herding of pelagic species, such as herring (Misund et al 1996) and anchovy and sardines (Soria et al 1996), into the path of the vessel. If this is the cause, one should expect the effect to end by the time of propeller passing.…”

Section: The Fish Reactionmentioning

confidence: 99%

When fish meet a trawling vessel: examining the behaviour of gadoids using a free-floating buoy and acoustic split-beam tracking

Handegard¹,

Tjøstheim²

2005

Can. J. Fish. Aquat. Sci.

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Abstract:The reaction of individual gadoids to a bottom-trawling vessel has been observed in situ in the Barents Sea using a free-floating buoy and acoustic target-tracking methods. More than 20 000 tracks were analysed in terms of velocity changes in vertical, athwarthship, and alongship direction relative to the vessel, the warps, and the trawl, respectively. The fish starts diving about 15 min before vessel passing. This coincides with the time the trawl is running and not with the gradual increase in vessel noise caused by the approaching vessel. The change in horizontal movement is more gradual and is directed away from the vessel in the alongship direction, but towards the vessel in the athwarthship direction. The strongest and sharpest response is related to the trawl warps. A strong herding in front of the warps is seen. Closer to the bottom, an athwarthship herding reaction is seen away from the trawl doors or possibly the lower parts of the warps. There were only minor differences when grouping the tracks according to light level, fish size, and fish density.Résumé : L'utilisation d'une bouée dérivante et de méthodes acoustiques de suivi de cibles dans la mer de Barents a permis d'observer in situ la réaction de gadoïdes individuels à un chalutier de fond. Nous avons ainsi analysé plus de 20 000 trajectoires en ce qui a trait aux changements de vitesse en directions verticale, perpendiculaire et parallèle au navire, aux aussières et au chalut. Le poisson commence à plonger environ 15 min avant le passage du navire. Cela coïncide avec le temps d'utilisation du chalut et non avec l'accroissement graduel du bruit causé par l'approche du navire. Le changement dans le déplacement horizontal est plus graduel et il est orienté en direction opposée au navire chez les poissons qui se déplacent parallèlement au navire et en direction du navire chez les poissons qui se déplacent perpendiculairement au navire. Les réactions les plus fortes et les plus marquées sont associées aux aussières du chalut. On observe de forts rassemblements devant les aussières. Plus près du fond, il se fait une réaction de rassemblement vers le navire pour fuir les portes du chalut ou peut-être les parties plus basses des aussières. Il n'y a que des différences mineures lorsqu'on regroupe les trajectoires en fonction du niveau de lumière, de la taille des poissons et de la densité des poissons.[Traduit par la Rédaction]

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Section: The Fish Reactionmentioning

confidence: 99%

When fish meet a trawling vessel: examining the behaviour of gadoids using a free-floating buoy and acoustic split-beam tracking

Handegard¹,

Tjøstheim²

2005

Can. J. Fish. Aquat. Sci.

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“…Fréon et al (1993a) explored parallels between vessel avoidance and avoidance from fish predators in clupeids. Experience gained from experiments with various species (Olsen et al, 1983a(Olsen et al, , 1983bOlsen, 1990;Fréon et al, 1993b;Gerlotto and Fréon, 1992;Misund et al, 1996;Ona and Korneliussen, 2000;Vabø et al, 2002) points to the fact that fish avoidance reactions to survey vessels can be expected, even though exceptions have been observed (Fernandes et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…According to the modelling theory of Olsen et al (1983b), the reaction of fish to vessel noise (Misund et al, 1996;Mitson and Knudsen, 2003) is a combination of horizontal avoidance and diving. While horizontal avoidance may lead to density draining (Ona and Korneliussen, 2000), the effect of diving on estimated density will depend upon how strongly a changed vertical orientation affects the acoustic backscattering cross-section of the fishes (Foote, 1987).…”

Section: Introductionmentioning

confidence: 99%

Possible vessel avoidance behaviour of capelin in a feeding area and on a spawning ground

et al. 2004

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“…As a result, vertical or horizontal herding occurs (Handegard and Tjøstheim, 2005;Misund et al, 1996). This effect may cause changes in the definition of the effective "trawl mouth area" (Handegard and Tjøstheim, 2009).…”

Section: Discussionmentioning

confidence: 99%

The size selectivity of the main body of a sampling pelagic pair trawl in freshwater reservoirs during the night

et al. 2012

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Reactions of herring schools to the sound field of a survey vessel

Cited by 22 publications

References 5 publications

When fish meet a trawling vessel: examining the behaviour of gadoids using a free-floating buoy and acoustic split-beam tracking

When fish meet a trawling vessel: examining the behaviour of gadoids using a free-floating buoy and acoustic split-beam tracking

Possible vessel avoidance behaviour of capelin in a feeding area and on a spawning ground

The size selectivity of the main body of a sampling pelagic pair trawl in freshwater reservoirs during the night

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