Constraints on energy intake in fish: the link between diet composition, energy metabolism, and energy intake in rainbow trout.
The hypothesis was tested that fish fed to satiation with iso-energetic diets differing in macronutrient composition will have different digestible energy intakes (DEI) but similar total heat production. Four iso-energetic diets (2 × 2 factorial design) were formulated having a contrast in i) the ra...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2012-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC3322127?pdf=render |
| _version_ | 1818957122333835264 |
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| author | Subramanian Saravanan Johan W Schrama A Claudia Figueiredo-Silva Sadasivam J Kaushik Johan A J Verreth Inge Geurden |
| author_facet | Subramanian Saravanan Johan W Schrama A Claudia Figueiredo-Silva Sadasivam J Kaushik Johan A J Verreth Inge Geurden |
| author_sort | Subramanian Saravanan |
| collection | DOAJ |
| description | The hypothesis was tested that fish fed to satiation with iso-energetic diets differing in macronutrient composition will have different digestible energy intakes (DEI) but similar total heat production. Four iso-energetic diets (2 × 2 factorial design) were formulated having a contrast in i) the ratio of protein to energy (P/E): high (H(P/E)) vs. low (L(P/E)) and ii) the type of non-protein energy (NPE) source: fat vs. carbohydrate which were iso-energetically exchanged. Triplicate groups (35 fish/tank) of rainbow trout were hand-fed each diet twice daily to satiation for 6 weeks under non-limiting water oxygen conditions. Feed intake (FI), DEI (kJ kg(-0.8) d(-1)) and growth (g kg(-0.8) d(-1)) of trout were affected by the interaction between P/E ratio and NPE source of the diet (P<0.05). Regardless of dietary P/E ratio, the inclusion of carbohydrate compared to fat as main NPE source reduced DEI and growth of trout by ~20%. The diet-induced differences in FI and DEI show that trout did not compensate for the dietary differences in digestible energy or digestible protein contents. Further, changes in body fat store and plasma glucose did not seem to exert a homeostatic feedback control on DEI. Independent of the diet composition, heat production of trout did not differ (P>0.05). Our data suggest that the control of DEI in trout might be a function of heat production, which in turn might reflect a physiological limit related with oxidative metabolism. |
| first_indexed | 2024-12-20T11:04:50Z |
| format | Article |
| id | doaj.art-ce1667e96135465092d1edc4959041a6 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-20T11:04:50Z |
| publishDate | 2012-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-ce1667e96135465092d1edc4959041a62022-12-21T19:42:54ZengPublic Library of Science (PLoS)PLoS ONE1932-62032012-01-0174e3474310.1371/journal.pone.0034743Constraints on energy intake in fish: the link between diet composition, energy metabolism, and energy intake in rainbow trout.Subramanian SaravananJohan W SchramaA Claudia Figueiredo-SilvaSadasivam J KaushikJohan A J VerrethInge GeurdenThe hypothesis was tested that fish fed to satiation with iso-energetic diets differing in macronutrient composition will have different digestible energy intakes (DEI) but similar total heat production. Four iso-energetic diets (2 × 2 factorial design) were formulated having a contrast in i) the ratio of protein to energy (P/E): high (H(P/E)) vs. low (L(P/E)) and ii) the type of non-protein energy (NPE) source: fat vs. carbohydrate which were iso-energetically exchanged. Triplicate groups (35 fish/tank) of rainbow trout were hand-fed each diet twice daily to satiation for 6 weeks under non-limiting water oxygen conditions. Feed intake (FI), DEI (kJ kg(-0.8) d(-1)) and growth (g kg(-0.8) d(-1)) of trout were affected by the interaction between P/E ratio and NPE source of the diet (P<0.05). Regardless of dietary P/E ratio, the inclusion of carbohydrate compared to fat as main NPE source reduced DEI and growth of trout by ~20%. The diet-induced differences in FI and DEI show that trout did not compensate for the dietary differences in digestible energy or digestible protein contents. Further, changes in body fat store and plasma glucose did not seem to exert a homeostatic feedback control on DEI. Independent of the diet composition, heat production of trout did not differ (P>0.05). Our data suggest that the control of DEI in trout might be a function of heat production, which in turn might reflect a physiological limit related with oxidative metabolism.http://europepmc.org/articles/PMC3322127?pdf=render |
| spellingShingle | Subramanian Saravanan Johan W Schrama A Claudia Figueiredo-Silva Sadasivam J Kaushik Johan A J Verreth Inge Geurden Constraints on energy intake in fish: the link between diet composition, energy metabolism, and energy intake in rainbow trout. PLoS ONE |
| title | Constraints on energy intake in fish: the link between diet composition, energy metabolism, and energy intake in rainbow trout. |
| title_full | Constraints on energy intake in fish: the link between diet composition, energy metabolism, and energy intake in rainbow trout. |
| title_fullStr | Constraints on energy intake in fish: the link between diet composition, energy metabolism, and energy intake in rainbow trout. |
| title_full_unstemmed | Constraints on energy intake in fish: the link between diet composition, energy metabolism, and energy intake in rainbow trout. |
| title_short | Constraints on energy intake in fish: the link between diet composition, energy metabolism, and energy intake in rainbow trout. |
| title_sort | constraints on energy intake in fish the link between diet composition energy metabolism and energy intake in rainbow trout |
| url | http://europepmc.org/articles/PMC3322127?pdf=render |
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