Gastric emptying and the return of appetite in juvenile turbot, Scophthalmus maximus L., fed on artificial diets
Gastric emptying time in Scophthalmus maximus , when fed friable artificial pellets based on fishmeal, is composed of two phases: (a) a delay time (t d ) during which the meal forms a bolus and which shortens with temperature, and (b) an emptying phase (duration t end ) which varies with meal size (...
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crwiley:10.1111/j.1095-8649.1985.tb04272.x 2024-06-02T08:14:10+00:00 Gastric emptying and the return of appetite in juvenile turbot, Scophthalmus maximus L., fed on artificial diets Grove, D. J. Moctezuma, M. A. Flett, H. R. J. Foott, J. S. Watson, T. Flowerdew, M. W. 1985 http://dx.doi.org/10.1111/j.1095-8649.1985.tb04272.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1985.tb04272.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1985.tb04272.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 26, issue 3, page 339-354 ISSN 0022-1112 1095-8649 journal-article 1985 crwiley https://doi.org/10.1111/j.1095-8649.1985.tb04272.x 2024-05-03T11:50:38Z Gastric emptying time in Scophthalmus maximus , when fed friable artificial pellets based on fishmeal, is composed of two phases: (a) a delay time (t d ) during which the meal forms a bolus and which shortens with temperature, and (b) an emptying phase (duration t end ) which varies with meal size ( S ), body weight ( W ) and temperature (71 according to: image (where t end is in h, S is in g, W is in g and T is °C). During the emptying phase, stomach contents decrease curvilinearly according to: image (where S t , & S o is in g and t is in h) in which the instantaneous digestion rate, K , varies with fish weight and temperature as: image Food pellets were prepared which remained separate and did not form a bolus in the stomach; K increased if a given meal size was subdivided to increase surface area. If meal size was increased by ingestion of identical pellets, K decreased. After a satiation meal, appetite in young turbot returns in direct relation to the degree of stomach emptiness. When food is regularly available, young turbot feed steadily at a rate which maintains their stomachs at c. 85% maximum fullness. When trained to use demand feeders, the fish interact as a group to feed rhythmically, but feeding rate falls 33% to only two‐thirds of the previous rate since stomach fullness, and hence digestion rate (g h −1 ), is maintained at a lower level. Reduction in dietary energy density below 1 kCal g −1 increases gastric emptying rate and the turbot demonstrate partial compensation by increasing food intake. On energy‐rich diets, protein nitrogen and energy assimilation efficiencies remain high (97 5% and 91% respectively) irrespective of feeding rate and frequency. Article in Journal/Newspaper Scophthalmus maximus Turbot Wiley Online Library Journal of Fish Biology 26 3 339 354 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Gastric emptying time in Scophthalmus maximus , when fed friable artificial pellets based on fishmeal, is composed of two phases: (a) a delay time (t d ) during which the meal forms a bolus and which shortens with temperature, and (b) an emptying phase (duration t end ) which varies with meal size ( S ), body weight ( W ) and temperature (71 according to: image (where t end is in h, S is in g, W is in g and T is °C). During the emptying phase, stomach contents decrease curvilinearly according to: image (where S t , & S o is in g and t is in h) in which the instantaneous digestion rate, K , varies with fish weight and temperature as: image Food pellets were prepared which remained separate and did not form a bolus in the stomach; K increased if a given meal size was subdivided to increase surface area. If meal size was increased by ingestion of identical pellets, K decreased. After a satiation meal, appetite in young turbot returns in direct relation to the degree of stomach emptiness. When food is regularly available, young turbot feed steadily at a rate which maintains their stomachs at c. 85% maximum fullness. When trained to use demand feeders, the fish interact as a group to feed rhythmically, but feeding rate falls 33% to only two‐thirds of the previous rate since stomach fullness, and hence digestion rate (g h −1 ), is maintained at a lower level. Reduction in dietary energy density below 1 kCal g −1 increases gastric emptying rate and the turbot demonstrate partial compensation by increasing food intake. On energy‐rich diets, protein nitrogen and energy assimilation efficiencies remain high (97 5% and 91% respectively) irrespective of feeding rate and frequency. |
format |
Article in Journal/Newspaper |
author |
Grove, D. J. Moctezuma, M. A. Flett, H. R. J. Foott, J. S. Watson, T. Flowerdew, M. W. |
spellingShingle |
Grove, D. J. Moctezuma, M. A. Flett, H. R. J. Foott, J. S. Watson, T. Flowerdew, M. W. Gastric emptying and the return of appetite in juvenile turbot, Scophthalmus maximus L., fed on artificial diets |
author_facet |
Grove, D. J. Moctezuma, M. A. Flett, H. R. J. Foott, J. S. Watson, T. Flowerdew, M. W. |
author_sort |
Grove, D. J. |
title |
Gastric emptying and the return of appetite in juvenile turbot, Scophthalmus maximus L., fed on artificial diets |
title_short |
Gastric emptying and the return of appetite in juvenile turbot, Scophthalmus maximus L., fed on artificial diets |
title_full |
Gastric emptying and the return of appetite in juvenile turbot, Scophthalmus maximus L., fed on artificial diets |
title_fullStr |
Gastric emptying and the return of appetite in juvenile turbot, Scophthalmus maximus L., fed on artificial diets |
title_full_unstemmed |
Gastric emptying and the return of appetite in juvenile turbot, Scophthalmus maximus L., fed on artificial diets |
title_sort |
gastric emptying and the return of appetite in juvenile turbot, scophthalmus maximus l., fed on artificial diets |
publisher |
Wiley |
publishDate |
1985 |
url |
http://dx.doi.org/10.1111/j.1095-8649.1985.tb04272.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1985.tb04272.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1985.tb04272.x |
genre |
Scophthalmus maximus Turbot |
genre_facet |
Scophthalmus maximus Turbot |
op_source |
Journal of Fish Biology volume 26, issue 3, page 339-354 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.1985.tb04272.x |
container_title |
Journal of Fish Biology |
container_volume |
26 |
container_issue |
3 |
container_start_page |
339 |
op_container_end_page |
354 |
_version_ |
1800737898652237824 |