Possible effects of pollock and herring on the growth and reproductive success of Steller sea lions ( Eumetopias jubatus ): insights from feeding experiments using an alternative animal model, Rattus norvegicus
The decline of Steller sea lions ( Eumetopias jubatus ) in the Gulf of Alaska appears to have been associated with a switch of diet from one dominated by fatty forage fishes (such as herring; Clupea pallasi ) to one dominated by low-fat fish (such as pollock; Theragra chalcogramma ). Observations ma...
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Online Access: | http://dx.doi.org/10.1079/bjn2002750 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0007114503000096 |
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crcambridgeupr:10.1079/bjn2002750 2024-04-07T07:56:13+00:00 Possible effects of pollock and herring on the growth and reproductive success of Steller sea lions ( Eumetopias jubatus ): insights from feeding experiments using an alternative animal model, Rattus norvegicus Donnelly, Carolyn P. Trites, A. W. Kitts, D. D. 2003 http://dx.doi.org/10.1079/bjn2002750 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0007114503000096 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms British Journal of Nutrition volume 89, issue 1, page 71-82 ISSN 0007-1145 1475-2662 Nutrition and Dietetics Medicine (miscellaneous) journal-article 2003 crcambridgeupr https://doi.org/10.1079/bjn2002750 2024-03-08T00:34:59Z The decline of Steller sea lions ( Eumetopias jubatus ) in the Gulf of Alaska appears to have been associated with a switch of diet from one dominated by fatty forage fishes (such as herring; Clupea pallasi ) to one dominated by low-fat fish (such as pollock; Theragra chalcogramma ). Observations made during the decline include reduced body size of sea lions, low pregnancy rates, and high mortality. We used the general mammalian model, the laboratory rat ( Rattus norvegicus ), to test whether changing the quality of prey consumed could cause changes in size and reproductive performance. Five groups of twelve female, weanling rats were fed diets composed of herring (H), pollock (P), pollock supplemented with herring oil (PH), pollock supplemented with pollock oil (PP), or a semi-purified diet (ICN). Mean body weights were greatest for H, followed by PH, P, PP and finally ICN, although ICN was the only group significantly different from the others ( P <0·05). Food intakes before mating were 10 % higher for groups on the lower-fat diets (P and ICN), resulting in similar energy intakes in all groups. The protein efficiency ratio was highest for the H diet, slightly lower for all pollock diets, and significantly lower for ICN ( P <0·05). The fetal weights for mothers fed P were significantly reduced ( P <0·05). The present study shows that the energy content was a major limiting factor in the nutritional quality of pollock. When food intake was adjusted to meet energetic requirements, there were no detrimental consequences from eating pollock. However, supplementation of pollock meal with additional pollock oil may reduce growth and reproductive performance, although the reasons for this were not apparent. Article in Journal/Newspaper Theragra chalcogramma Alaska Cambridge University Press Gulf of Alaska British Journal of Nutrition 89 1 71 82 |
institution |
Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Nutrition and Dietetics Medicine (miscellaneous) |
spellingShingle |
Nutrition and Dietetics Medicine (miscellaneous) Donnelly, Carolyn P. Trites, A. W. Kitts, D. D. Possible effects of pollock and herring on the growth and reproductive success of Steller sea lions ( Eumetopias jubatus ): insights from feeding experiments using an alternative animal model, Rattus norvegicus |
topic_facet |
Nutrition and Dietetics Medicine (miscellaneous) |
description |
The decline of Steller sea lions ( Eumetopias jubatus ) in the Gulf of Alaska appears to have been associated with a switch of diet from one dominated by fatty forage fishes (such as herring; Clupea pallasi ) to one dominated by low-fat fish (such as pollock; Theragra chalcogramma ). Observations made during the decline include reduced body size of sea lions, low pregnancy rates, and high mortality. We used the general mammalian model, the laboratory rat ( Rattus norvegicus ), to test whether changing the quality of prey consumed could cause changes in size and reproductive performance. Five groups of twelve female, weanling rats were fed diets composed of herring (H), pollock (P), pollock supplemented with herring oil (PH), pollock supplemented with pollock oil (PP), or a semi-purified diet (ICN). Mean body weights were greatest for H, followed by PH, P, PP and finally ICN, although ICN was the only group significantly different from the others ( P <0·05). Food intakes before mating were 10 % higher for groups on the lower-fat diets (P and ICN), resulting in similar energy intakes in all groups. The protein efficiency ratio was highest for the H diet, slightly lower for all pollock diets, and significantly lower for ICN ( P <0·05). The fetal weights for mothers fed P were significantly reduced ( P <0·05). The present study shows that the energy content was a major limiting factor in the nutritional quality of pollock. When food intake was adjusted to meet energetic requirements, there were no detrimental consequences from eating pollock. However, supplementation of pollock meal with additional pollock oil may reduce growth and reproductive performance, although the reasons for this were not apparent. |
format |
Article in Journal/Newspaper |
author |
Donnelly, Carolyn P. Trites, A. W. Kitts, D. D. |
author_facet |
Donnelly, Carolyn P. Trites, A. W. Kitts, D. D. |
author_sort |
Donnelly, Carolyn P. |
title |
Possible effects of pollock and herring on the growth and reproductive success of Steller sea lions ( Eumetopias jubatus ): insights from feeding experiments using an alternative animal model, Rattus norvegicus |
title_short |
Possible effects of pollock and herring on the growth and reproductive success of Steller sea lions ( Eumetopias jubatus ): insights from feeding experiments using an alternative animal model, Rattus norvegicus |
title_full |
Possible effects of pollock and herring on the growth and reproductive success of Steller sea lions ( Eumetopias jubatus ): insights from feeding experiments using an alternative animal model, Rattus norvegicus |
title_fullStr |
Possible effects of pollock and herring on the growth and reproductive success of Steller sea lions ( Eumetopias jubatus ): insights from feeding experiments using an alternative animal model, Rattus norvegicus |
title_full_unstemmed |
Possible effects of pollock and herring on the growth and reproductive success of Steller sea lions ( Eumetopias jubatus ): insights from feeding experiments using an alternative animal model, Rattus norvegicus |
title_sort |
possible effects of pollock and herring on the growth and reproductive success of steller sea lions ( eumetopias jubatus ): insights from feeding experiments using an alternative animal model, rattus norvegicus |
publisher |
Cambridge University Press (CUP) |
publishDate |
2003 |
url |
http://dx.doi.org/10.1079/bjn2002750 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0007114503000096 |
geographic |
Gulf of Alaska |
geographic_facet |
Gulf of Alaska |
genre |
Theragra chalcogramma Alaska |
genre_facet |
Theragra chalcogramma Alaska |
op_source |
British Journal of Nutrition volume 89, issue 1, page 71-82 ISSN 0007-1145 1475-2662 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1079/bjn2002750 |
container_title |
British Journal of Nutrition |
container_volume |
89 |
container_issue |
1 |
container_start_page |
71 |
op_container_end_page |
82 |
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1795673993453240320 |