Studies on the nutrition and metabolism of turbot (Scophthalmus maximus L) with reference to fish farming
This thesis provides the first detailed study of maximal oxygen consumption of turbot on a fish farm over a range of fish sizes and temperatures. Also provided is a study of the diets used in turbot farming and the development of a diet that contains no fresh fish. A detailed study of previous resea...
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Aston University
1980
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ftdatacite:10.48780/publications.aston.ac.uk.00010518 2023-05-15T18:15:53+02:00 Studies on the nutrition and metabolism of turbot (Scophthalmus maximus L) with reference to fish farming Brown, James A.G. 1980 https://dx.doi.org/10.48780/publications.aston.ac.uk.00010518 https://publications.aston.ac.uk/id/eprint/10518 unknown Aston University Dissertation thesis Thesis 1980 ftdatacite https://doi.org/10.48780/publications.aston.ac.uk.00010518 2022-02-08T14:57:16Z This thesis provides the first detailed study of maximal oxygen consumption of turbot on a fish farm over a range of fish sizes and temperatures. Also provided is a study of the diets used in turbot farming and the development of a diet that contains no fresh fish. A detailed study of previous research on flatfish nutrition, identified fresh fish, sprat in particular, as the optimum diet for turbot farming. A series of experiments was undertaken that confirmed this and also identified one possible explanation for the optimum performance of sprat, as a function of high non-protein energy ratios in sprat. This factor was exploited in the production of a diet containing no fresh fish and which produced superior results to diets containing fresh fish; the optimum level of lipid in the diet was determined as 18%. The study of oxygen consumption was on fully-fed fish so that maximum demand could be quantified. Continuous monitoring of tank water oxygen levels enabled the calculation of the Specific Dynamic Action (SDA) effect in turbot and the relation of it to dietary energy. Variation of SDA with the dietary energy profile was identified as a contributing factor to differential fish growth on various diets. Finally, the implications of this work to fish farming were considered. Economic appraisal and comparison of the diets routinely used in turbot farming identified that the diet developed as a result of this work, ie the diet containing no fresh fish protein, was more cost effective on the basis of the production of one tonne of turbot. The study of oxygen consumption enables water supply to be calculated for any fish size between 1g and 1000g between the temperatures of 7® C and 16® C. The quantification of SDA enables correct adjustment of oxygen flows according to the feeding status of the fish. Doctoral or Postdoctoral Thesis Scophthalmus maximus Turbot DataCite Metadata Store (German National Library of Science and Technology) |
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This thesis provides the first detailed study of maximal oxygen consumption of turbot on a fish farm over a range of fish sizes and temperatures. Also provided is a study of the diets used in turbot farming and the development of a diet that contains no fresh fish. A detailed study of previous research on flatfish nutrition, identified fresh fish, sprat in particular, as the optimum diet for turbot farming. A series of experiments was undertaken that confirmed this and also identified one possible explanation for the optimum performance of sprat, as a function of high non-protein energy ratios in sprat. This factor was exploited in the production of a diet containing no fresh fish and which produced superior results to diets containing fresh fish; the optimum level of lipid in the diet was determined as 18%. The study of oxygen consumption was on fully-fed fish so that maximum demand could be quantified. Continuous monitoring of tank water oxygen levels enabled the calculation of the Specific Dynamic Action (SDA) effect in turbot and the relation of it to dietary energy. Variation of SDA with the dietary energy profile was identified as a contributing factor to differential fish growth on various diets. Finally, the implications of this work to fish farming were considered. Economic appraisal and comparison of the diets routinely used in turbot farming identified that the diet developed as a result of this work, ie the diet containing no fresh fish protein, was more cost effective on the basis of the production of one tonne of turbot. The study of oxygen consumption enables water supply to be calculated for any fish size between 1g and 1000g between the temperatures of 7® C and 16® C. The quantification of SDA enables correct adjustment of oxygen flows according to the feeding status of the fish. |
format |
Doctoral or Postdoctoral Thesis |
author |
Brown, James A.G. |
spellingShingle |
Brown, James A.G. Studies on the nutrition and metabolism of turbot (Scophthalmus maximus L) with reference to fish farming |
author_facet |
Brown, James A.G. |
author_sort |
Brown, James A.G. |
title |
Studies on the nutrition and metabolism of turbot (Scophthalmus maximus L) with reference to fish farming |
title_short |
Studies on the nutrition and metabolism of turbot (Scophthalmus maximus L) with reference to fish farming |
title_full |
Studies on the nutrition and metabolism of turbot (Scophthalmus maximus L) with reference to fish farming |
title_fullStr |
Studies on the nutrition and metabolism of turbot (Scophthalmus maximus L) with reference to fish farming |
title_full_unstemmed |
Studies on the nutrition and metabolism of turbot (Scophthalmus maximus L) with reference to fish farming |
title_sort |
studies on the nutrition and metabolism of turbot (scophthalmus maximus l) with reference to fish farming |
publisher |
Aston University |
publishDate |
1980 |
url |
https://dx.doi.org/10.48780/publications.aston.ac.uk.00010518 https://publications.aston.ac.uk/id/eprint/10518 |
genre |
Scophthalmus maximus Turbot |
genre_facet |
Scophthalmus maximus Turbot |
op_doi |
https://doi.org/10.48780/publications.aston.ac.uk.00010518 |
_version_ |
1766189121882030080 |