NOAA Fisheries

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NOAA Fisheries
Biased length frequencies in fisheries stock
assessment Eliza Heery In many marine
fisheries, length measurements are compiled from
sub-samples of the total catch in order to
provide information about the dynamics of the
population.  Often this data contains biases.
 Eliza is considering how bias in length
frequency data can affect model estimates that
are crucial for fisheries management by using a
simulation approach to consider the effects of
bias based on two different scenarios.
Service RTR Unit
Research at the RTR Unit focuses on providing
critical information for the proper management of
our nation's marine resources
Dr. Jim Berkson, Dr. Yan Jiao
Paige Barlow, Bonnie Coggins,
Christopher Hayes, Melissa Hedges, Eliza Heery,
James Thorson
Eliza
Warsaw Grouper
Juvenile Gag grouper
Black Sea Bass
Life history and stock assessment of hammerhead
sharks in the Gulf of Mexico and northwest
Atlantic Ocean Christopher Hayes Chris is using
catch data and abundance indices to estimate the
change in population abundance of hammerhead
sharks (Sphyrna spp.) in the western North
Atlantic Ocean and Gulf of Mexico. He will
estimate life-history parameters such as
population growth rate and current population
size, and simulate future population dynamics
based on likely effects of a number of
alternative fishing management policies.
Chris with a neo-natal hammerhead
Chris getting the length measurement of teleost
bycatch