Salmon in Preserved Rivers
نویسندگان
چکیده
منابع مشابه
Downstream Migration of Salmon Smolts in Regulated Rivers: Factors Affecting Survival and Behaviour
Atlantic salmon is one of the most widely known migratory fish species whose populations have declined because of hydropower installations. Attempts have been made to preserve salmon stocks in regulated rivers by building fishways for adult fish migrating upstream, but downstream migration of salmon smolts has been almost totally ignored. Instead, captive breeding programmes and extensive stock...
متن کاملCorrection: Survival of Migrating Salmon Smolts in Large Rivers With and Without Dams
(2008) Fish invasions in the world's river systems: When natural processes are blurred by human activities. PLoS Biol 6(2): e28. The content of the published Dataset S1 was incorrect, due to a procedural error when the file was created. A corrected version of this file is now available. The figures and analysis presented elsewhere in the research article are not affected, as these were created ...
متن کاملSpatio-Temporal Migration Patterns of Pacific Salmon Smolts in Rivers and Coastal Marine Waters
BACKGROUND Migrations allow animals to find food resources, rearing habitats, or mates, but often impose considerable predation risk. Several behavioural strategies may reduce this risk, including faster travel speed and taking routes with shorter total distance. Descriptions of the natural range of variation in migration strategies among individuals and populations is necessary before the ecol...
متن کاملSurvival of Migrating Salmon Smolts in Large Rivers With and Without Dams
The mortality of salmon smolts during their migration out of freshwater and into the ocean has been difficult to measure. In the Columbia River, which has an extensive network of hydroelectric dams, the decline in abundance of adult salmon returning from the ocean since the late 1970s has been ascribed in large measure to the presence of the dams, although the completion of the hydropower syste...
متن کاملUse of preserved museum fish to evaluate historical and current mercury contamination in fish from two rivers in Oklahoma, USA.
We examined the effects of a commonly used preservation technique on mercury concentration in fish tissue. After fixing fish muscle tissue in formalin followed by preservation in isopropanol, we found that mercury concentration in fish muscle tissue increased by 18%, reaching an asymptote after 40 days. We used formalin-isopropanol-preserved longear sunfish (Lepomis megalotis) from the Sam Nobl...
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ژورنال
عنوان ژورنال: Nature
سال: 1881
ISSN: 0028-0836,1476-4687
DOI: 10.1038/024461a0