Fish Age Validation Using Bomb-Produced Radiocarbon in Alaska

Alaska Fisheries Science Center researchers conducted a fish age validation study on yellowfin sole and northern rockfish from 1987 to 2004. The study compares otolith Delta14C measurements from these species against reference chronologies from the eastern Bering Sea and Gulf of Alaska. It employs Bayesian data analysis and Markov Chain Monte Carlo simulation to estimate age determination bias and uncertainty.

Use Cases

• Validate age determination methods for yellowfin sole by comparing otolith Delta14C against the eastern Bering Sea reference chronology.
• Assess age accuracy for northern rockfish by analyzing otolith Delta14C concordance with the Gulf of Alaska reference chronology.
• Quantify age determination bias and its uncertainty using Bayesian data analysis on the Delta14C validation samples.
• Explore differences in otolith 14C uptake between fish from the eastern Bering Sea and Gulf of Alaska basins.
• Apply an information-theoretic hypothesis testing approach to compare validation datasets across different oceanic basins.

Strengths

• Study spans a 17-year period from 1987 to 2004.
• Analysis includes two distinct fish species from two major Alaskan oceanic basins.
• Employs advanced statistical methods including Bayesian analysis and MCMC simulation.

Limitations

• Specific sample sizes, row counts, and column details are unknown.
• Data is temporally stale, with the last update in 2004.
• Geographic scope is limited to two Alaskan regions, limiting broader applicability.

Provenance

Source

NOAA National Centers for Environmental Information (NCEI), Alaska Fisheries Science Center, Fisheries Monitoring and Analysis division.

Collection Method

Fish age validation using bomb-produced radiocarbon (14C) analysis of otoliths, compared to established reference chronologies.

Time Range

1987-01-01 to 2004-01-01

Freshness

Data collection ended in 2004.

Geography

Eastern Bering Sea and Gulf of Alaska.