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Project Information

Title: Were Pink Salmon Embryo Studies in PWS Biased?

Project Year and Number: 2002: 02492

Other Fiscal Years and Numbers for this Project: 2001: 01492

Principal Investigator (PI): John Thedinga, NOAA

Assisting Personnel: Mark Carls, Ron Heintz, Jacek Maselko, Jeep Rice, Robert Thomas

Research Location: Auke Bay Laboratory

Restoration Category: Research

Injured Resources Addressed: Pink Salmon

Abstract: Effects of the oil spill on wild pink salmon embryo survival in Prince William Sound are disputed among government- and industry-sponsored researchers. Exxon contends that the government's conclusions that reduced embryo viability in oiled streams was caused by persistent oil contamination were biased because sampling times were earlier in oiled streams than in reference streams. Experimental studies to determine the ability to discriminate eggs killed by sampling (shock mortality) and previously dead eggs were conducted to help ascertain if estimates of embryo survival in the sound were accurate or biased. Preliminary results indicate that shock resistance of eggs increased in a sigmoidal fashion from the end of September to mid-November and that the timing of egg examination after being pumped from a stream is critical in differentiating shocked eggs from previously dead eggs. By removing eggs pumped from stream gravel soon after sampling, shocked eggs were easily discernible and could easily be separated from previously dead eggs. These results suggest that further examination of procedures used for egg sampling in the sound following the oil spill would not help clarify the controversy over potential biased estimates of egg survival.


Species Fish - Salmon
Fields of Expertise Contaminants/Toxicology
Management & Policy
Technological Methods Modeling

Proposal: View PDF (106 KB)

Funding Recommendations: View

Funding Detail For: 2002

Quarterly Project Tasks For: 2002

Annual Report: 2002: Not Available

Final Report: See Project 444

Publications from this Project: None Available

More information may be available for this project under other years:

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Project Number Proposal Annual Reports Final Report Data
2001: 01492 View (PDF) 2001: Not Available
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