Influence of feeding sequence, light and colour on the performance of a self-grading system designed for turbot (Scophthalmus maximus).
Grading of cultured flatfish is essential to maintain even sizes and to avoid potential feeding dominance or cannibalism. Current hand-grading and forced mechanical grading methods result in labour costs and additional stress to animals, reducing their growth performance. This study tested a self-gr...
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ftawi:oai:epic.awi.de:44537 2024-05-12T08:10:41+00:00 Influence of feeding sequence, light and colour on the performance of a self-grading system designed for turbot (Scophthalmus maximus). Bögner, Mirko Zwicker, Sarah Bögner, Desislava Slater, Matthew James 2017 https://epic.awi.de/id/eprint/44537/ https://hdl.handle.net/10013/epic.50954 unknown Bögner, M. orcid:0000-0001-5844-7348 , Zwicker, S. , Bögner, D. orcid:0000-0002-8318-8568 and Slater, M. J. orcid:0000-0001-8588-544X (2017) Influence of feeding sequence, light and colour on the performance of a self-grading system designed for turbot (Scophthalmus maximus). , Aquacultural Engineering, 77 , pp. 1-8 . hdl:10013/epic.50954 EPIC3Aquacultural Engineering, 77, pp. 1-8 Article isiRev 2017 ftawi 2024-04-17T14:05:02Z Grading of cultured flatfish is essential to maintain even sizes and to avoid potential feeding dominance or cannibalism. Current hand-grading and forced mechanical grading methods result in labour costs and additional stress to animals, reducing their growth performance. This study tested a self-grading system allowing Turbot (Scophthalmus maximus) to self-grade, based on size, between tank sections within 8000 L tanks designated as “Graded (G)” and “Non-Graded (NG)”. The effect on grading success (percentage of graded animals / total gradable individuals) of stimuli (light, feeding sequence and colour of the grading device) and without stimuli was analyzed over 9 days. Mean grading success without stimuli was 38.1 ± 11.5 %. Grading success was not improved by changes in feeding sequence (30.6 ± 10.2 %) or altered colour of the grading device (30.9 ± 13.8 %). Marked increases in grading success were obtained by adding a light source to the G section (52.9 ± 12.4 %), and by combining the presence of a light source and the feeding sequence (57.9 ± 14.4 %). The combination of light sources and changes to the colour of the self-grading device resulted in the highest mean grading success (72.1 ± 18.2 %) overall. Light and colour stimuli combined yielded the highest self-grading maximum (88.36 ± 5.3 %), achieved on day 6 after experimental onset. A three-parameter asymptotic exponential equation was fitted to the data from each stimulus and parameters describing the curves of all conditions are reported. The present results indicate that the tested self-grading systems for Turbot can be highly efficient if used with the appropriate stimuli. Self-grading systems operating at the measured levels of success offer a viable alternative to stressful grading events, avoiding significant commercial disadvantages as well as improving animal welfare and performance. Article in Journal/Newspaper Scophthalmus maximus Turbot Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
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description |
Grading of cultured flatfish is essential to maintain even sizes and to avoid potential feeding dominance or cannibalism. Current hand-grading and forced mechanical grading methods result in labour costs and additional stress to animals, reducing their growth performance. This study tested a self-grading system allowing Turbot (Scophthalmus maximus) to self-grade, based on size, between tank sections within 8000 L tanks designated as “Graded (G)” and “Non-Graded (NG)”. The effect on grading success (percentage of graded animals / total gradable individuals) of stimuli (light, feeding sequence and colour of the grading device) and without stimuli was analyzed over 9 days. Mean grading success without stimuli was 38.1 ± 11.5 %. Grading success was not improved by changes in feeding sequence (30.6 ± 10.2 %) or altered colour of the grading device (30.9 ± 13.8 %). Marked increases in grading success were obtained by adding a light source to the G section (52.9 ± 12.4 %), and by combining the presence of a light source and the feeding sequence (57.9 ± 14.4 %). The combination of light sources and changes to the colour of the self-grading device resulted in the highest mean grading success (72.1 ± 18.2 %) overall. Light and colour stimuli combined yielded the highest self-grading maximum (88.36 ± 5.3 %), achieved on day 6 after experimental onset. A three-parameter asymptotic exponential equation was fitted to the data from each stimulus and parameters describing the curves of all conditions are reported. The present results indicate that the tested self-grading systems for Turbot can be highly efficient if used with the appropriate stimuli. Self-grading systems operating at the measured levels of success offer a viable alternative to stressful grading events, avoiding significant commercial disadvantages as well as improving animal welfare and performance. |
format |
Article in Journal/Newspaper |
author |
Bögner, Mirko Zwicker, Sarah Bögner, Desislava Slater, Matthew James |
spellingShingle |
Bögner, Mirko Zwicker, Sarah Bögner, Desislava Slater, Matthew James Influence of feeding sequence, light and colour on the performance of a self-grading system designed for turbot (Scophthalmus maximus). |
author_facet |
Bögner, Mirko Zwicker, Sarah Bögner, Desislava Slater, Matthew James |
author_sort |
Bögner, Mirko |
title |
Influence of feeding sequence, light and colour on the performance of a self-grading system designed for turbot (Scophthalmus maximus). |
title_short |
Influence of feeding sequence, light and colour on the performance of a self-grading system designed for turbot (Scophthalmus maximus). |
title_full |
Influence of feeding sequence, light and colour on the performance of a self-grading system designed for turbot (Scophthalmus maximus). |
title_fullStr |
Influence of feeding sequence, light and colour on the performance of a self-grading system designed for turbot (Scophthalmus maximus). |
title_full_unstemmed |
Influence of feeding sequence, light and colour on the performance of a self-grading system designed for turbot (Scophthalmus maximus). |
title_sort |
influence of feeding sequence, light and colour on the performance of a self-grading system designed for turbot (scophthalmus maximus). |
publishDate |
2017 |
url |
https://epic.awi.de/id/eprint/44537/ https://hdl.handle.net/10013/epic.50954 |
genre |
Scophthalmus maximus Turbot |
genre_facet |
Scophthalmus maximus Turbot |
op_source |
EPIC3Aquacultural Engineering, 77, pp. 1-8 |
op_relation |
Bögner, M. orcid:0000-0001-5844-7348 , Zwicker, S. , Bögner, D. orcid:0000-0002-8318-8568 and Slater, M. J. orcid:0000-0001-8588-544X (2017) Influence of feeding sequence, light and colour on the performance of a self-grading system designed for turbot (Scophthalmus maximus). , Aquacultural Engineering, 77 , pp. 1-8 . hdl:10013/epic.50954 |
_version_ |
1798854169214320640 |