Comparison of Three Methods for Estimating the Food Intake of a Fish
Majkowski and Waiwood's (1981. Can. J. Fish. Aquat. Sci. 38: 1199–1206) method for evaluating the food intake of a fish involves numerically solving a first-order ordinary differential equation and using a minimization procedure. In this note, that method is compared with its two modifications...
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Canadian Science Publishing
1984
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crcansciencepubl:10.1139/f84-024 2024-05-19T07:40:36+00:00 Comparison of Three Methods for Estimating the Food Intake of a Fish Majkowski, Jacek Hearn, William S. 1984 http://dx.doi.org/10.1139/f84-024 http://www.nrcresearchpress.com/doi/pdf/10.1139/f84-024 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 41, issue 1, page 212-215 ISSN 0706-652X 1205-7533 journal-article 1984 crcansciencepubl https://doi.org/10.1139/f84-024 2024-04-25T06:52:02Z Majkowski and Waiwood's (1981. Can. J. Fish. Aquat. Sci. 38: 1199–1206) method for evaluating the food intake of a fish involves numerically solving a first-order ordinary differential equation and using a minimization procedure. In this note, that method is compared with its two modifications created by (1) the elimination of a mathematical approximation ("improved method") (but this makes the food intake estimation computationally even more difficult), and (2) the introduction of a different mathematical approximation ("simplified method") to involve only simple algebraic calculations. As a result of the latter modification, a certain assumption in the original and improved methods is relaxed and the required experimental information is reduced. Growth and bioenergetic data concerning Gulf of St. Lawrence cod (Gadus morhua) are used to illustrate the three methods and to examine the validity of the mathematical approximations introduced. The use of the original method results in larger errors in food intake estimates for cod than the simplified method. The food intake estimates using the improved method differ considerably (by 3.6–23.5% and 1.7–10.4%, respectively) from those based on the original and simplified methods, if the corresponding ratio of the weight increment to the initial weight is large (>2.3). Article in Journal/Newspaper Gadus morhua Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 41 1 212 215 |
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Canadian Science Publishing |
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English |
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Majkowski and Waiwood's (1981. Can. J. Fish. Aquat. Sci. 38: 1199–1206) method for evaluating the food intake of a fish involves numerically solving a first-order ordinary differential equation and using a minimization procedure. In this note, that method is compared with its two modifications created by (1) the elimination of a mathematical approximation ("improved method") (but this makes the food intake estimation computationally even more difficult), and (2) the introduction of a different mathematical approximation ("simplified method") to involve only simple algebraic calculations. As a result of the latter modification, a certain assumption in the original and improved methods is relaxed and the required experimental information is reduced. Growth and bioenergetic data concerning Gulf of St. Lawrence cod (Gadus morhua) are used to illustrate the three methods and to examine the validity of the mathematical approximations introduced. The use of the original method results in larger errors in food intake estimates for cod than the simplified method. The food intake estimates using the improved method differ considerably (by 3.6–23.5% and 1.7–10.4%, respectively) from those based on the original and simplified methods, if the corresponding ratio of the weight increment to the initial weight is large (>2.3). |
format |
Article in Journal/Newspaper |
author |
Majkowski, Jacek Hearn, William S. |
spellingShingle |
Majkowski, Jacek Hearn, William S. Comparison of Three Methods for Estimating the Food Intake of a Fish |
author_facet |
Majkowski, Jacek Hearn, William S. |
author_sort |
Majkowski, Jacek |
title |
Comparison of Three Methods for Estimating the Food Intake of a Fish |
title_short |
Comparison of Three Methods for Estimating the Food Intake of a Fish |
title_full |
Comparison of Three Methods for Estimating the Food Intake of a Fish |
title_fullStr |
Comparison of Three Methods for Estimating the Food Intake of a Fish |
title_full_unstemmed |
Comparison of Three Methods for Estimating the Food Intake of a Fish |
title_sort |
comparison of three methods for estimating the food intake of a fish |
publisher |
Canadian Science Publishing |
publishDate |
1984 |
url |
http://dx.doi.org/10.1139/f84-024 http://www.nrcresearchpress.com/doi/pdf/10.1139/f84-024 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 41, issue 1, page 212-215 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f84-024 |
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Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
41 |
container_issue |
1 |
container_start_page |
212 |
op_container_end_page |
215 |
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1799480178519310336 |