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Detection of PIT-Tagged Juvenile Salmonids in the Columbia River Estuary using a Pair-Trawl, 2000 and 2001
| 题名： | Detection of PIT-Tagged Juvenile Salmonids in the Columbia River Estuary using a Pair-Trawl, 2000 and 2001 |
| 作者： | Ledgerwood, R. D.; Naman, S. W.; Ryan, B. A.; Sandford, B. P.; Banks, C. Z.; Ferguson, J. W. |
| 关键词： | Juvenile salmonids##PIT-tagged##Columbia River Estuary##Pair trawl##Detection data##Migrational timing##Relative survival##National Marine Fisheries Service (NMFS)##Passive integrated transponder (PIT) tags## |
| 摘要： | In 2000 and 2001, National Marine Fisheries Service (NMFS) researchers continued sampling juvenile salmonids tagged with passive integrated transponder (PIT) tags using a surface pair-trawl fitted with a PIT-tag detection antenna. Here we report and compare detection data from two dissimilar years: 2000, which was characterized by high river-flows, and 2001, which was characterized by near-record low river-flows. Our sampling efforts targeted several large annual release groups of PIT-tagged fish: about 150,000 tagged fish from the Snake River transportation study, about 135,000 tagged fish from The Dalles Dam survival study (2000 only), and about 180,000 tagged fish from the comparative hatchery survival study. Estuarine detections of many other release groups of PIT-tagged fish were also recorded both years. |
| 总页数： | 111 |
| 报告类型： | 科技报告 |
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