A video analysis procedure for assessing vertical fish distribution in aquaculture tanks

Stien, Lars Helge; Bratland, Silje; Austevoll, Ivar Magne; Oppedal, Frode; Kristiansen, Tore

doi:10.1016/j.aquaeng.2007.03.002

Cited by 54 publications

(38 citation statements)

References 19 publications

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“…A good feed anticipatory response and feed intake can be signs of high feeding motivation and unstressed fish (Fernö et al 1995(Fernö et al , 2006. Experiments with salmon subjected to classical conditioning showed Fish Physiol Biochem (2012) 38:17-41 27 that the anticipatory response after giving a conditioned signal was affected by acute stress, and the time for recovery to normal baseline behaviours was longer than the period of elevated cortisol levels (Stien et al 2007, Bratland et al 2010. However, increased swimming activity prior to and during a meal can also be a sign of underfeeding or a poorly designed feeding regime (e.g.…”

Section: Group Swimming Behaviourmentioning

confidence: 99%

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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%

“…In most fish species, exposure to negative stimuli leads to rapid escape movements towards the bottom of the tanks or cages, and concentration of the group near the bottom can indicate relatively recent exposure to acute stressors (Stien et al 2007, FASTFISH 2009Bratland et al 2010).…”

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

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“…Second, these methodologies are designed to measure the "round fish" biomass and so they require the view of a whole fish (Ruff et al, 1995;Bedow et al, 1996;Israeli and Kimmel, 1996;Stien et al, 2007;Costa et al, 2009;Hufschimied et al, 2011). Fish overlapping is the most common circumstance in flatfish culture, so it wouldn't be possible to use them with these species.…”

Section: Discussionmentioning

confidence: 99%

“…Computer-imaging techniques in aquaculture are widely used to monitor behavior and welfare of fish (Cordero et al, 1994;Kato et al, 1996;Conte, 2004;Kristiansen et al, 2004;Stien et al, 2007;Duarte et al, 2009), to counting fish (Costa et al, 2009), to stock identification (Cadrin and Friedland, 1999;White et al, 2006;), and to estimate size and weight (Ruff et al, 1995;Bedow et al, 1996;Sheih and Petrell, 1998;Tillet et al, 2000;Lines et al, 2001;Martinez-de Dios et al, 2003;Costa et al, 2006Costa et al, , 2009Hufschmied et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

The laser scanner is a reliable method to estimate the biomass of a Senegalese sole (Solea senegalensis) population in a tank

Almansa

Reig

Oca

2015

Aquacultural Engineering

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The measurement of total fish biomass is an essential practice in the aquaculture management. The method commonly used which involves removing a sub-sample of fish from a tank, weighing it and extrapolating the result to the whole tank, carries a large error, is intense labor and causes great stress. Here, we tested a laser scanning method to estimate the total fish biomass from the total fish volume of a sole population (Solea senegalensis) in a tank.The ratio FB/FLV of Fish Biomass (FB), weighing the 100 % of soles, versus the Fish layer volume (FLV) measured by the laser scanning, is calculated. Different fish size (small and large) and stocking densities (very low, low, medium and high) were tested. To test the method in the worst conditions, in Very Low stocking density, fish were 3.0 g ± 1.1 (individual mean weight ± SD); but in Low, Medium and High stocking density fish were 234.0 g ± 84.6 (individual mean weight ± SD). The fish layer volume included the fish biomass and the interstitial water present among them, which can be estimated from the ratio FB/FLV. In Medium and High rearing densities with larger fish the ratio takes values very close to 1 (0.957 ± 0.021 and 0.967 ± 0.011) giving percentages of interstitial water lower than 5%. But in Very Low stocking density (0.4 kg/m2) with smaller fish (3.0 g ± 1.1), the ratio FB/FLV was much lower, giving a non-realistic percentage of interstitial water estimation. The low ratios obtained at very low stocking densities are due to the resolution of the image catching 2 process, which is aggravated when working with small fish, since the error of a pixel from a digital image represents a larger percentage of error than with larger fish and higher stocking density. It should be noted that the Coefficient of Variation (CV) obtained was very low (in all cases lower than 7.2 %) and decreased as the stocking density increased achieving the lowest value (1.1 %) at High stocking density. The laser scanning has proven to be a useful tool to estimate the total fish layer volume of flatfish, and thus fish biomass, in an aquaculture tank with a usual grow-out stocking density for sole, reducing the labor involved and the stress commonly associated to manual sampling.

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“…data). While acute exposure to light elicits a strong response, further research must address the issue that with increasing use of light stimuli, salmon may become habituated to the cue and no longer consider it threatening (Stien et al 2007, Bratland et al 2010, Folkedal et al 2010.…”

Section: Responses Of Fish To Light and Feed During Submergencementioning

confidence: 99%

Modifying Atlantic salmon behaviour with light or feed stimuli may improve parasite control techniques

Bui¹,

Oppedal²,

Korsøen³

et al. 2013

Aquacult. Environ. Interact.

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The aquaculture of Atlantic salmon Salmo salar faces severe health, environmental and economic concerns caused by the parasitic sea lice Lepeophtheirus salmonis and Caligus spp. An experimental delousing method exists whereby the surface jumping behaviours of salmon are combined with a floating, oil-infused chemical therapeutant, resulting in the fish dousing themselves passively. We tested whether a light stimulus or feed event, or a combination of both, during submergence (denial of surface access for the fish) increased the surface-oriented behaviours of salmon. Groups of 10 salmon were submerged in a sea-cage for 19 h and exposed to a light stimulus, feed event, or both. Control treatments involved submergence only. For a 2 h period after surface access was reinstated, light and feed treatments induced a higher proportion of individuals to exhibit surface behaviours. On average, 84 and 82% of salmon in the light and feed treatments jumped, respectively, which was 1.6 times higher than fish in the control group (50%). Salmon exposed to light or feed jumped an average of 1.7 and 1.5 times after exposure to light or feed treatments, respectively, compared to 0.92 jumps fish -1 for the control. The combined light and feed treatment did not produce a synergistic effect. The average time until first jump was 31 to 50 min, with no difference in times among treatments. The elevated surface-oriented behaviours effectively crowded the majority of the fish in the surface waters within a short period of time. This increased surface activity may be used for a range of salmon farming applications, including improving the efficacy of sea-lice treatment techniques.

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A video analysis procedure for assessing vertical fish distribution in aquaculture tanks

Cited by 54 publications

References 19 publications

Behavioural indicators of welfare in farmed fish

Behavioural indicators of welfare in farmed fish

The laser scanner is a reliable method to estimate the biomass of a Senegalese sole (Solea senegalensis) population in a tank

Modifying Atlantic salmon behaviour with light or feed stimuli may improve parasite control techniques

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