Fish Passage in Montana Culverts : Phase Ii - Passage Goals 2007

Cover Fish Passage in Montana Culverts : Phase Ii - Passage Goals 2007
Fish Passage in Montana Culverts : Phase Ii - Passage Goals 2007
Montana.Dept. of Transportation
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This project reported a very low probability that a given fish would successfully enter and pass all culverts in the system, even when each culvert along that path had shown to be passable.
This approach considers all distractions from passing through the system, including motivation, availability of downstream spawning habitat, predation, mortality, culverts, natural barriers and a host of other issues. When examining the role of culverts exclusively in a stream system , it is recommended that
... the passage probability for each successive culvert be applied in series 43 (multiplicatively). In the stream study reach, the distribution of tagged fish detected in the system was not uniform, even in the most downstream reach that had no identifiable barriers.
This indicates that caution should be exercised when assuming that stream miles or spatial measures of habitat richness are of equal value regardless of position in the system when assessing the priority of a barrier for replacement or repair.


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