Use of artificial light to control swimming depth and fish density of Atlantic salmon (Salmo salar) in production cages

Juell, Jon‐Erik; Fosseidengen, Jan Erik

doi:10.1016/j.aquaculture.2003.10.026

Cited by 94 publications

(60 citation statements)

References 14 publications

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“…In fish tanks and cages, there will usually be areas that are more favourable than the others and restricting these volumes will result in a trade-off between packing density (number of fish per cubic metre, Juell and Fosseidengen 2004) and environmental conditions. Especially in sea cages, there can be large environmental gradients, with highly variable temperature, salinity, oxygen, current speed and light conditions (Juell 1995, Juell and Fosseidengen 2004, Johansson et al 2006. Fish are attracted to the most optimal areas and avoid the unfavourable ones as a result of both attractions to a part of the rearing volume with preferred environmental conditions and avoidance/repulsion from areas with poor environmental conditions.…”

Section: Group Swimming Behaviourmentioning

confidence: 99%

Behavioural indicators of welfare in farmed fish

Martins¹,

Galhardo²,

Noble³

et al. 2011

Current Views on Fish Welfare

120

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Behaviour represents a reaction to the environment as fish perceive it and is therefore a key element of fish welfare. This review summarises the main findings on how behavioural changes have been used to assess welfare in farmed fish, using both functional and feeling-based approaches. Changes in foraging behaviour, ventilatory activity, aggression, individual and group swimming behaviour, stereotypic and abnormal behaviour have been linked with acute and chronic stressors in aquaculture and can therefore be regarded as likely indicators of poor welfare. On the contrary, measurements of exploratory behaviour, feed anticipatory activity and rewardrelated operant behaviour are beginning to be considered as indicators of positive emotions and welfare in

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Section: Group Swimming Behaviourmentioning

confidence: 99%

Behavioural indicators of welfare in farmed fish

Martins¹,

Galhardo²,

Noble³

et al. 2011

Current Views on Fish Welfare

120

View full text Add to dashboard Cite

show abstract

“…For example, studies in fisheries have already shown species attraction by shorter wavelength lights [4]. In parallel with fisheries, related studies have already shown promising results for salmon manipulation [17] and pathogen avoidance [5] through guidance in different swimming depths.…”

Section: Discussionmentioning

confidence: 99%

“…Such studies have been widely performed in a variety of farmed species in a way to promote animal welfare. Particularly, studies in caged Atlantic salmon [15] and cod [16] have already shown that this species can alter its vertical distribution looking for optimal conditions but also, it can be vertically guided in the cage environment via artificial light [17]. Such studies demonstrate the potential of artificial light to promote fish welfare [6], disease avoidance [18] and sexual maturation [19].…”

Section: Introductionmentioning

confidence: 99%

Behavioural Differences in Tank-Held European Sea Bass under Dark/Light Environment

Glaropoulos¹,

Papadakis²,

Kentouri³

2018

JAMB

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The study investigated the behavior of European sea bass (Dicentrarchus labrax), in laboratory-scale conditions and controlled light environment. Fish were confined in tanks that had been previously split into two equal compartments. A tear on the net allowed fish to freely moved between the two compartments. An extra net frame, placed above tanks altered light environment to: (1) Illuminated Holding Area -Shadow Escape Area, (2) Shadowed Holding Area -Illuminated Escape Area and 3) Illuminated Holding Area -Illuminated Escape Area, as control condition, for a period of 13 days. Sea bass showed a strong preference to the illuminated compartment of the tank, from the beginning of the trials. Crossings to the shadowed compartment were regular but always followed by a reverse action to the illuminated area. In addition, they occurred in series of 7 individuals. Reverse crossings to the initial shadowed compartment were rarely observed throughout the experiment, even if fish had to suffer starvation. Behavioural results regarding sea bass light preference may have essential implications in marine biology and aquaculture, including species domestication as well as manipulation via artificial light.

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“…In the particular case of the Atlantic salmon, their preference for the deeper areas of the net pens, under certain light and temperature conditions, has been described (Juell & Fosseidengen, 2004). In this context, the deformation of the net pens not only affects the internal volume but also alters the preferences of fish in captivity, since currents tend to raise the bottom of the net pen, forcing fish to stay in the upper levels of the water column.…”

Section: Discussionmentioning

confidence: 99%

Volume loss of an aquaculture net pen due to current speed and linear weight of sinker ring

López

Hurtado

Queirolo

et al. 2015

lajar

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ABSTRACT. The internal volume of aquaculture net pens is an important variable to fish comfort during the culture process. In this research, a module of net pens was modelled using the finite element (FE) software AquaSim®. The net pens deformation was analyzed under different current speeds (0.25, 0.50 and 0.75 m s ). It was found that under the most severe condition, that is, the highest current speed and the lowest linear weight of the sinker ring (0.75 m s -1 and 25 kg m -1 , respectively), the volume loss with respect to initial undeformed net pen volume reached a maximum value of 53%. This occurred in the net pen firstly exposed to currents. Based on modeling results, a relationship between net pen volume loss due to the combined effects of both water current speed and linear weights of the sinker rings is proposed. Key words: net pen deformation, current speed, sinker ring, Chile. , respectivamente), la pérdida de volumen de la primera jaula del módulo alcanzó 53%. A partir de los resultados obtenidos en los modelos, se determinó una función que relaciona la pérdida de volumen de la jaula con la velocidad de corriente y el peso lineal del anillo cortacorrientes. Palabras clave: deformación de la jaula, velocidad de corriente, anillo cortacorriente, Chile.

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Use of artificial light to control swimming depth and fish density of Atlantic salmon (Salmo salar) in production cages

Cited by 94 publications

References 14 publications

Behavioural indicators of welfare in farmed fish

Behavioural indicators of welfare in farmed fish

Behavioural Differences in Tank-Held European Sea Bass under Dark/Light Environment

Volume loss of an aquaculture net pen due to current speed and linear weight of sinker ring

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