BPA Fish and Wildlife FY 1997 Proposal
Section 1. Administrative
Section 2. Narrative
Section 3. Budget
see CBFWA and BPA funding recommendations
Title of project
Delayed Mortality in Transported Smolts
BPA project number 5515100
Business name of agency, institution or organization requesting funding
Sponsor type Placeholder
Proposal contact person or principal investigator
BPA technical contact ,
Biological opinion ID RM&EP; Hypothesis B.1.1.1
NWPPC Program number
With inriver survival as a baseline, determine if survival of transported smolts after release comports with the hypothesis of zero delayed loss. The problem to date is that accurate estimates of inriver migrant survival through all reaches have been unavailable. Success depends on extension of mainstem reach survival studies downstream to at least The Dalles Dam (TDA).
Project start year 1997 End year
Start of operation and/or maintenance 0
Project development phase PLANNING
Biological results achieved
Annual reports and technical papers
A key question in the decision path for juvenile migrations (see Figure 1, blocks I-IV) is whether transportation of smolts should be employed under most conditions. One aspect of resolving this issue is to evaluate the extent, if any, that delayed mortality plays in overall mortality of transported smolts. This project addresses the null hypothesis that there is no delayed mortality due to transportation.
Specific measureable objectives
Hypothesis B.1.1.1.: Transported smolts do not suffer delayed mortality caused by transportation.
Underlying assumptions or critical constraints
Success depends on extension of mainstem reach survival studies downstream to at least The Dalles Dam (TDA), and would be further enhanced with PIT-tag interogaton capability in the lower river or estuary.
Approaches such as holding fish in netpens to evaluate post-transport residual effects (e.g., as suggested in the SRRP (Task No. 2.4.c.)) will not address the hypothesis in holistic fashion. It can always be argued that the fish were not held long enough to observe residual effects, and that delayed mortality occurs long after release of smolts. Thus, only survival to adulthood of transported smolts v. multi-project survival of inriver migrants will address the hypothesis.
Brief schedule of activities
Survival of transported fish should be greater than that of inriver migrants by the factor represented by the inverse of total inriver mortality. The problem to date is that accurate estimates of inriver migrant survival through all reaches have been unavailable. Those estimates require reach-specific studies through the system, or a large portion of it and modeling of the remainder, with PIT tag detection at all feasible points. With inriver survival as a baseline, one can determine if survival of transported smolts after release comports with the hypothesis of zero delayed loss.
Extent of delayed mortality of transported juvenile migrants.
Summary of expected outcome
Data should be available for more than 1 year of each condition and for a variety of conditions. Decisions as to whether to transport or not in given flow years will depend on the spectrum of results from such studies. Survival of inriver migrants and, to a lesser degree, transported smolts, will depend on extant conditions, including flow, temperature, and fish condition.
Dependencies/opportunities for cooperation
With inriver survival as a baseline, one can determine if survival of transported smolts after release comports with the hypothesis of zero delayed loss. If a practical means of capturing and interrogating smolts in the estuary is developed, it may be feasible to extend the post-release stanza, providing some data before adults return
|Historic costs||FY 1996 budget data*||Current and future funding needs|
|(none)||New project - no FY96 data available||1997: 200,000|
* For most projects, Authorized is the amount recommended by CBFWA and the Council. Planned is amount currently allocated. Contracted is the amount obligated to date of printout.
CBFWA funding review group System Policy
Recommendation Tier 2 - fund when funds available
Recommended funding level $200,000