Demand feeding and welfare in farmed fish

Attia, J.; Millot, Sandie; Di-Poï, Carole; Bégout, Marie‐Laure; Noble, Chris; Sánchez-Vázquez, F.J.; Terova, Genciana; Saroglia, Marco; Damsgård, Børge

doi:10.1007/s10695-011-9538-4

Cited by 42 publications

(21 citation statements)

References 95 publications

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“…Living Resour. 25, 251-258 (2012) described for several species (Attia et al 2012). For instance, Montoya et al (2011) found that gilthead sea bream (Sparus aurata) given the choice between two self-feeders containing either an oxidised diet or a non-oxidised control diet, within 10 days developed a preference for the feeder containing the control diet.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of self-feeders as a tool to study diet preferences in groups of Atlantic cod (Gadus morhua)

Millot

Nilsson

Fosseidengen

et al. 2012

Aquat. Living Resour.

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-Among other applications, self-feeding has been used to study food preferences in fish allowing them to choose between feeders with different food content. Preference tests assume that (i) trigger actuations are motivated by appetite, (ii) fish can learn which feeder contains which food and discriminate between feeders solely on the basis of their content, and (iii) in groups of fish, the triggering preferences is representative for the individuals of the group. We studied individual triggering behaviour in four groups of 14 Atlantic cod (length of 34 ± 2 cm, weight of 424 ± 102 g, mean ± SE, water temperature comprised between 7−8• C) that were first given the choice between two self-feeders with identical content (Period 1 of 14 days) and subsequently with one feeder full and the other empty (Period 2 of 14 days) . In all four groups, one or two individuals performed the majority of the actuations, and in three groups the high triggering fish was a female high-ranked for size and growth rate. Cod displayed a preference for one of the two feeders despite their identical content. When the preferred feeder was emptied, the preference switched after one to eight days but both feeders were still actuated throughout the experiment. In conclusion, the assumption that actuation frequency reflects food preference and is representative for the individuals of the group may not be true, at least for Atlantic cod. If aiming at determining preferences representative for the whole population multiple representative fish should be kept isolated in separate tanks, with self-feeders containing each food option, on each tank.

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Section: Introductionmentioning

confidence: 99%

Evaluation of self-feeders as a tool to study diet preferences in groups of Atlantic cod (Gadus morhua)

Millot

Nilsson

Fosseidengen

et al. 2012

Aquat. Living Resour.

Self Cite

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“…The feed intake was very similar in both treatment groups, showing that in this trial, spreading of the feed on the water surface did not affect the mean feed intake in salmon. Spreading the feed on the water surface is generally believed to reduce variance in feed intake and correspondingly, body weight, in fish (Attia et al, 2012;Ryer and Olla, 1996). This is assumed to be due to that feeding from one point may favor the most dominant individuals whereas when spreading the feed, it is available to all individuals.…”

Section: Discussionmentioning

confidence: 99%

“…Spreading of feed across the surface is assumed to increase feed intake in fish by making feed available to all individuals and minimize hierarchical behavior during feeding. The manner of feed dispersal influences the equality of access of feed among individuals (reviewed by Attia et al, 2012). At restricted feeding, the aggression level may be high (Jones et al, 2010), and localized feeding may result in larger growth variation among individuals than when feed is dispersed.…”

Section: Introductionmentioning

confidence: 99%

Feed intake in Atlantic salmon fed with or without surface spreading of feed

Synnøve

Ytrestøyl

Åsgård

et al. 2020

Jour. Agri. & Mar. Scie.

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In intensive salmon farming, it is common practice to spread the feed over a large surface area, assuming that spreading of the feed increases feed intake in the fish. However, the impact on the feed pellets during spreading results in feed loss due to pellet breakage. In this study, feed intake, growth and signs of aggressive behavior was compared in salmon fed without or with spreading of the feed on the surface area of the tanks. Atlantic salmon (Salmo salar) with initial body weight 0.6 kg were kept in 3.3 m 3 tanks supplied with sea water (salinity 32 %, mean temperature 11 °C) for one month. The salmon were fed one meal daily, either by dropping the feed from one point, or by spreading the feed over the water surface. Feed intake and growth was measured. Fin damage was given a score at termination of the trial as a measure of competitive behavior during feeding. The relative feed intake (i.e. percent of body weight per day) in salmon fed without spreading or with spreading of the feed was 0.63±0.05 and 0.64±0.02 %, respectively. The growth rate was identical in salmon fed without or with spreading of the feed, and no significant difference in variance in final weight was found. No difference in fin damage for salmon fed without or with spreading of the feed was revealed. The data showed that for the conditions used in this trial, spreading of feed had no influence on feed intake or growth of salmon.

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“…Currently, the range of cultured fish as well as culture systems is widely increased meaning that optimizing of feeding technique is difficult to precise for appropriate species, size category and culture conditions (Zhou, Xu, Lin, Sun, & Yang, ). However, the self‐feeding systems served good option for farming practice in line with lower levels of some welfare indicators (Attia et al, ). Main advantage of such systems is that they allow fish to choose their feeding time and frequency, which is not ensured in other feeding systems (automatic feeders, hand feeding) and fed according to their biological rhythms (Benhaïm, Ferrari, Colchen, Chatain, & Bégout, ; López‐Olmeda, Noble, & Sánchez‐Vázquez, ).…”

Section: Discussionmentioning

confidence: 99%

Fin damage and growth parameters relative to stocking density and feeding method in intensively cultured European perch (Perca fluviatilis L.)

Stejskal

Matoušek

Prokešová

et al. 2019

Journal of Fish Diseases

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We evaluated the relationship of stocking density to survival, growth performance and fin condition of European perch Perca fluviatilis with hand feeding and self-feeders. Hand-fed perch (body weight 19.1 ± 5.1 g and total length 107 ± 9 mm) were reared at 0.5, 1.0, 1.5 and 2.0 fish/L. Self-feeding perch (body weight 25.4 ± 3.9 g and total length 128 ± 7 mm) were reared at stocking densities of 0.6, 1.0 and 1.4 fish/L.Pond-reared perch served as a comparison group for fin damage assessment. We found no differences in survival rate among stocking densities with either feeding method. Hand-fed fish displayed the highest weight gain and SGR at stocking density of 0.5 fish/L. The self-feeding fish showed a non-linear association of weight gain with stocking density with the highest growth at 1.0 fish/L. Fin length was noticeably greater in pond-reared fish compared with RAS-reared fish regardless of feeding method. In both experiments, fin length relative to standard length showed a negative relationship with stocking density, with pectoral fins showing the greatest effect.Fin condition deteriorated with increasing stocking density, and growth was highest at 0.5 and 1.0 fish/L in hand-fed and self-feeding fish, respectively. K E Y W O R D Sfin erosion, intensive culture, Perca fluviatilis, self-feeders, stocking density, welfare

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Demand feeding and welfare in farmed fish

Cited by 42 publications

References 95 publications

Evaluation of self-feeders as a tool to study diet preferences in groups of Atlantic cod (Gadus morhua)

Evaluation of self-feeders as a tool to study diet preferences in groups of Atlantic cod (Gadus morhua)

Feed intake in Atlantic salmon fed with or without surface spreading of feed

Fin damage and growth parameters relative to stocking density and feeding method in intensively cultured European perch (Perca fluviatilis L.)

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