Influence of the timing of weaning on growth and survival of juvenile winter flounder (Pseudopleuronectesamericanus)
| Autor: | Michel Bélanger, Céline Audet, Matthew K. Litvak, Yvan Lambert, Réjean Tremblay, François Turcotte |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
business.industry 010604 marine biology & hydrobiology Fish farming media_common.quotation_subject Zoology Aquatic animal 04 agricultural and veterinary sciences Biology biology.organism_classification 01 natural sciences Aquaculture 040102 fisheries Pseudopleuronectes 0401 agriculture forestry and fisheries Juvenile Weaning Winter flounder Animal Science and Zoology Metamorphosis business Ecology Evolution Behavior and Systematics media_common |
| Zdroj: | Canadian Journal of Zoology. 96:1291-1298 |
| ISSN: | 1480-3283 0008-4301 |
| Popis: | Metamorphosis is a critical developmental stage that presents particular challenges in fish aquaculture. The sharp increase in mortality that accompanies this transformation has often been attributed to nutritional deficiencies. Providing live feed (the rotifer Brachionus plicatilis Müller, 1786 and the brine shrimp Artemia salina (Linnaeus, 1758)) during the larval stages is costly and labour intensive, which explains why much effort has been put on early weaning. However, previous observations in winter flounder (Pseudopleuronectes americanus (Walbaum, 1792)) indicate that juveniles weaned after settlement had better survival than those weaned at the larval stage. In this study, we tested whether late weaning (at settlement (W0) and groups maintained on co-feeding for 1 month (W1), two months (W2), or 3 months (W3) after settlement) could improve juvenile survival and lipid composition. Our results demonstrated that maintaining co-feeding beyond the larval stage was essential for after-settlement survival. Juveniles co-fed until 90 days after settlement were 32.5% heavier. Analyses of fatty acid trophic markers suggested that juveniles preferentially fed on enriched rotifers rather than inert food. No pigmentation or fin erosion problems were observed in any of the weaning treatments, which indicates good rearing conditions. |
| Databáze: | OpenAIRE |
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