Long-term monitoring of individual fish triggering activity on a self-feeding system: An example using European sea bass (Dicentrarchus labrax)

Covès, Denis; Beauchaud, Marilyn; Attia, J.; Dutto, Gilbert; Bouchut, Colette; Bégout, Marie Laure

doi:10.1016/j.aquaculture.2005.08.015

Cited by 49 publications

(104 citation statements)

References 19 publications

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“…Both results clearly indicate that the ability of fish to cope with the new environmental challenges is associated with their escape success. This is in agreement with other studies, where it is stated that the previous experience and knowledge of fish may have an influence on their current behaviour (Berejikian et al, 2001;Coves et al, 2006;Salvanes & Braithwaite, 2006).…”

Section: The Effect Of a Visual Obstaclesupporting

confidence: 93%

Do the visual conditions at the point of escape affect European sea bass escape behavior?

Papadakis

Glaropoulos

et al. 2013

Medit. Mar. Sci.

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European sea bass (Dicentrarchus labrax), an important species for the Mediterranean aquaculture industry, has been reported to escape from sea cage installations. Fish escapes are caused mainly by operational and technical failures that eventually create tears. Escapees may interact with wild stocks through interbreeding, transfer of pathogens and competition for food. The aim of this study was to examine to what extent the presence of a visible obstacle close to a tear in the net influences sea bass propensity to escape. Fish were initially confined into small sea cages, with a tear on one side. The escape behaviour was tested under experimental conditions. It is clearly demonstrated that sea bass were able to locate a tear in the net pen, immediately after its appearance. Crossings occurred in all cages, in singles or in a series of up to seven individuals. The presence of an obstacle close to the net tear altered the escape behaviour of D. labrax, resulting in a delay that eventually reduced the escape rate. To conclude, it is highly recommended that sea bass cages should be kept internally the culture array. Furthermore, the placement of artificial obstacles close to the sea cages could be an efficient practice that mitigates the escape risk after severe environmental conditions.

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Section: The Effect Of a Visual Obstaclesupporting

confidence: 93%

Do the visual conditions at the point of escape affect European sea bass escape behavior?

Papadakis

Glaropoulos

et al. 2013

Medit. Mar. Sci.

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“…This diurnal/nocturnal behaviour of sea bass has been described in relation to seasonal variations in photoperiod and water temperature (Bégout Anras 1995), sudden changes in environmental conditions (Anthouard et al 1993;Sánchez-Vázquez et al 1995b) and several intrinsic factors such as motivational level, and visual (Bardach and Todd 1970) and social stimuli ). Among the studies cited above, many used on-demand feeding systems but the relative individual contribution to feed demand was seldom investigated (Covès et al 2006;Di-Poi et al 2008;Millot et al 2008). It has however been pointed out that individual roles could direct group feeding under environmentally controlled conditions (Millot et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Individual fish rhythm directs group feeding: a case study with sea bass juveniles (Dicentrarchus labrax) under self-demand feeding conditions

Millot

Bégout

2009

Aquat. Living Resour.

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-The long term influence of individual biological rhythms on group feed demand behaviour was investigated in European sea bass (Dicentrarchus labrax) held under controlled environmental conditions with an on-demand feeding system. The experiment was realized over 219 days with 190 fish distributed on 4 tanks. Sea bass had a mean body mass comprised between 139 g to 183 g. The number of feed demand acts by each individual was calculated daily, and the population could thus be partitioned into three categories (high-, low-and zero-triggering fish). The duration of the period that an individual held high-triggering status could vary, but was 63 ± 16 days on average. The transition period between two highest-triggering fish in one tank was on average 4 ± 4 days. The group feeding rhythm followed the same pattern of feed demand rhythm as the highest-triggering individual fish. When the highest-triggering fish was nocturnal, the totality of feed demand in the group was realized during the night with one peak at 22:00, corresponding to dusk under experimental conditions. When the highest-triggering fish was diurnal, the majority of feed demand in the group was realized during the light period with one peak at 06:00, corresponding to dawn, and/or another at 12:00. This study therefore highlights that sea bass group feeding behaviour is not the sum of individual feed demand behaviours, but is directed by the rhythm and behaviour of a few high-triggering fish. The regular changes of high-triggering fish in the group proved that it was not the identity of these particular fish that was most important for the group, but their role as a feed demand leader. Key words:Feeding rhythms / Feed demand leader / Social interactions / Self-feeder / Dicentrarchus labrax Résumé -L'influence à long terme des rythmes biologiques individuels sur le comportement alimentaire du groupe est étudiée sur des bars européens (Dicentrarchus labrax) maintenus dans des conditions environnementales contrôlées et avec un système d'alimentation à la demande. L'expérience est réalisée sur 219 jours avec 190 poissons répartis dans 4 bassins. Les bars ont un poids corporel moyen compris entre 139 g à 183 g. Le nombre de demande alimentaire réalisée par chaque individu est calculé quotidiennement, et la population a pu être divisée en trois catégories (manipulateur principal, occasionnel et non manipulateur). La durée pendant laquelle un manipulateur principal reste actif peut varier, mais elle est en moyenne de 63 ± 16 jours. La période de transition entre deux manipulateurs principaux dans un bassin est en moyenne de 4 ± 4 jours. Le rythme alimentaire du groupe suit le même patron que celui du manipulateur principal. Lorsque le manipulateur principal est nocturne, la totalité des demandes alimentaires du groupe est réalisée pendant la nuit avec un pic à 22:00, correspondant au crépuscule dans les conditions expérimentales. Lorsque le manipulateur principal est diurne, la majorité des demandes alimentaires du groupe est réalisée pendant la périod...

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“…Behavioral studies have been done to bridge this gap, since behavior can be measured continuously, e.g. with the passive integrated transponder (PIT)-tag data entry station technology (Alanä rä and Brä nnä s, 1993; Baras et al, 2000a;Coves et al, 2006). However, behavioral measures provide an indication of the access to the feeding area or food, but not of the actual food intake.…”

Section: Introductionmentioning

confidence: 99%

Growth heterogeneity in rearing sea bass (Dicentrarchus labrax): test of hypothesis with an iterative energetic model

Campeas

Brun-Bellut

Baras

et al. 2009

Animal

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This study aimed at modeling the relative importance of food intake on growth heterogeneity among cultured sea bass (Dicentrarchus labrax). First, we designed an individual growth model comprising five compartments (Energy intake, Losses, Net Energy, Recovered Energy and Maintenance). This model was calibrated with a first experiment carried out in eight tanks; A total of 130 juveniles (11 g) per tank were fed by a self-feeder (84 days, 208C, 16L : 8D, 30 g NaCl/l). A second experiment was performed to better understand the relation between individual food intake, individual growth and growth heterogeneity, using the model as a tool for a hypothetico-deductive approach on growth heterogeneity (135 passive integrated transpondertagged fish, same rearing conditions as above and individual food intake measured by X-ray every 14 days). The tested hypotheses were that food intake was (a) homogeneous, (b) proportional to the fish weight (i.e. to W 1.00 ) X-ray (c) proportional to W 0.66 and (d) reflected by the X-ray measurements of food intake. For each hypothesis, a simple linear regression between experimental and simulated results was produced. The Fitness indicators of these analyses, together with their confidence intervals (calculated by bootstrapping), allowed testing the relevance of these hypotheses. The analysis indicated that growth heterogeneity was largely accounted for by individual variations of food intake, as revealed by the X-ray analysis, and that food intake was proportional to W 1.00 , which suggests a dominance hierarchy where small fish are incapable of feeding maximally.Keywords: sea bass, growth, heterogeneity, energetic model IntroductionSize heterogeneity is a recurrent issue in aquaculture, since it largely facilitates the exercise of cannibalism (Baras and Jobling, 2002;Kestemont et al., 2003) and frequently imposes grading practices. Growth dispersal among cultured animals is not specific to fish, but it is generally more intense among fish than among other taxa. According to Gjedrem (2000), the coefficient of variation for body weight typically ranges from 7% to 10% in livestock farm animals, whereas it varies between 20% and 35% in most cultured fish species. Size heterogeneity has been extensively studied and attributed to a broad series of factors, of intrinsic or extrinsic nature. In brief, individual fish are likely to exhibit genuine capacities for growth that differ slightly, e.g., because their standard metabolic rates (Cutts et al., 2001;Bang et al., 2004) or digestive abilities are different (Lemieux et al., 1999), growth dispersal can be dependent on the degree of heterozygosity (Tiira et al., 2006). These factors are likely to be buffered or amplified by between-individual variations in food intake, which have been demonstrated on several occasions to be the driving factor behind growth depensation (e.g. Jobling and Baardvik, 1994). In theory, all environmental factors that impact on food intake and growth can impact directly on growth heterogeneity (Gelineau et al., 1998;Jo...

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Long-term monitoring of individual fish triggering activity on a self-feeding system: An example using European sea bass (Dicentrarchus labrax)

Cited by 49 publications

References 19 publications

Do the visual conditions at the point of escape affect European sea bass escape behavior?

Do the visual conditions at the point of escape affect European sea bass escape behavior?

Individual fish rhythm directs group feeding: a case study with sea bass juveniles (Dicentrarchus labrax) under self-demand feeding conditions

Growth heterogeneity in rearing sea bass (Dicentrarchus labrax): test of hypothesis with an iterative energetic model

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