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Papers by Benjamin Sandford

Journal of Aquatic Animal Health, Dec 1, 2006

Various methods have been developed to mitigate the effects of dams on juvenile Pacific salmon On... more Various methods have been developed to mitigate the effects of dams on juvenile Pacific salmon Oncorhynchus spp. migrating to the Pacific Ocean through the Columbia River basin. In this study, we examined the health of hatchery Snake River spring and summer Chinook salmon relative to two mitigating strategies: dam bypass and transportation (e.g., barging). The health of out-migrants was assessed in terms of the difference in the incidence of mortality among fish, categorically grouped into no-bypass, bypass, and transportation life histories, in response to challenge with the marine pathogen Listonella anguillarum during seawater holding. These three life histories were defined as follows: (1) fish that were not detected at any of the juvenile bypass systems above Bonneville Dam were classified as having a no-bypass life history; (2) fish that were detected at one or more juvenile bypass systems above Bonneville Dam were classified as having a bypass life history; and (3) fish that were barged were classified as having the transportation life history. Barged fish were found to be less susceptible to L. anguillarum than in-river fish-whether bypassed or not-which suggests that transportation may help mitigate the adverse health effects of the hydropower system of the Columbia River basin on Snake River spring-summer Chinook salmon. The findings of this study are not necessarily transferable to other out-migrant stocks in the Columbia River basin, given that only one evolutionarily significant unit, that is, Snake River spring-summer Chinook salmon, was used in this study.

... Axel, Brian J. Burke, Kinsey E. Frick, Randall F. Absolon and Benjamin P. Sandford Report of ... more ... Axel, Brian J. Burke, Kinsey E. Frick, Randall F. Absolon and Benjamin P. Sandford Report of research by Fish Ecology Division Northwest Fisheries Science Center National Marine Fisheries Service National Oceanic and Atmospheric Administration 2725 Montlake Boulevard ...

Transactions of the American Fisheries Society, Mar 1, 2012

Http Dx Doi Org 10 1577 1548 8675019 2 0 Co 2, Jan 8, 2011

... We calculated three performance measures for evaluating this system: untagged diversion ratio... more ... We calculated three performance measures for evaluating this system: untagged diversion ratio, separation ... Feasibility of using implantable passive integrated transponder (PIT) tags in salmonids. In Fish-marking techniques, Symposium 7 Edited by: Parker, NC, Giorgi, AE ...

EXECUTIVE SUMMARY In 2008, the National Marine Fisheries Service, in collaboration with Oregon St... more EXECUTIVE SUMMARY In 2008, the National Marine Fisheries Service, in collaboration with Oregon State University and Real Time Research, Inc., recovered passive integrated transponder (PIT) tags from piscivorous bird colonies in the Columbia River basin (CRB). ...

North American Journal of Fisheries Management, Feb 1, 2001

Transactions of the American Fisheries Society, Jul 1, 2010

The objective of this study was to evaluate a newly miniaturized prototype of an implantable acou... more The objective of this study was to evaluate a newly miniaturized prototype of an implantable acoustic tag for use in subyearling hatchery Chinook salmon Oncorhynchus tshawytscha. In 2003, when the study was conducted, the relatively large size of most acoustic tags limited their use in juvenile fish. We evaluated this miniaturized prototype tag (21 × 7 × 6 mm, 0.9 g in air) for effects on growth, survival, and tag retention. All fish were passive integrated transponder (PIT) tagged in accordance with the proposed practical application in which PIT-tagged fish from known sources were separated from the general migrating population. The PIT tags also permitted tracking of individual fish growth in relation to treatment. We compared growth and acoustic tag retention over 30 d among tagged, sham-tagged, and control fish. Ratio of tag weight to body weight ranged from 2.6% to 5.9% at tagging. The acoustic tag significantly affected growth (P = 0.001 for both length and weight differences), but no fish died as a result of the tagging. Partial to complete tag expulsion was noted in 37% of the tagged fish after 30 d. Our study showed that impeded growth and tag expulsion may affect the successful use of this tag size in juvenile Chinook salmon. This evaluation led to physical tag modifications that improved biological acceptance by the fish, thus facilitating the tag's use in applied studies. Implanted devices should be evaluated before use to ensure compatibility and to avoid data misinterpretations due to their effects on the fish.

Transactions of the American Fisheries Society, Jun 21, 2012