Habitat Improvement Project, No. 12 Public Deposited

http://ir.library.oregonstate.edu/concern/technical_reports/vm40xs61n

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  • "The upper drainage of the John Day River system produces summer steelhead and spring chinook salmon. The fish are generally confined to the main stem and its tributaries above Prairie City. The spawning and rearing areas are comparatively free of undesirable fish species, but salmonid smolts migrating downstream must travel through populations of large predatory squawfish. The purpose of the study was to determine if salmonid smolt survival could be increased through removal of the large squawfish by treatment with rotenone. A 40-mile section of the John Day River between Dayville and John Day was selected for study. A pretreatment fish population inventory was conducted to determine the species and numbers of fish present within the test area. Significantly large populations of undesirable fish and correspondingly low numbers of salmonids were observed in the test area...Posttreatment inventory of fish populations within the study area has shown that average size and number of squawfish was effectively reduced and that salmonid numbers can be increased by temporary control of rough fish populations." (Abstract from Authors)
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  • File scanned at 300 ppi (256 Grayscale) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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  • description.provenance : Made available in DSpace on 2013-10-24T14:23:42Z (GMT). No. of bitstreams: 1 HabitatImprovementProject n. 12 Best Available Copy.pdf: 6547953 bytes, checksum: 69d79a5e6e72a5b9ec2fdc6ef47dc51d (MD5) Previous issue date: 1965
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-10-24T14:23:42Z (GMT) No. of bitstreams: 1 HabitatImprovementProject n. 12 Best Available Copy.pdf: 6547953 bytes, checksum: 69d79a5e6e72a5b9ec2fdc6ef47dc51d (MD5)
  • description.provenance : Submitted by Susan Gilmont (susan.gilmont@orst.edu) on 2013-10-17T23:27:23Z No. of bitstreams: 1 HabitatImprovementProject n. 12 Best Available Copy.pdf: 6547953 bytes, checksum: 69d79a5e6e72a5b9ec2fdc6ef47dc51d (MD5)

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