Loggerhead sea turtle nesting beach survey and population model development Melissa Hedges Melissa is tagging nesting loggerhead sea turtles to estimate adult survival rate and female fecundity. Adult survival is an important component in
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Loggerhead sea turtle nesting beach survey and population model development
Melissa is tagging nesting loggerhead
sea turtles to estimate adult survival
rate and female fecundity. Adult
survival is an important component in
understanding the dynamics of the population and how it will respond to conservation measures.
A female loggerhead lays her eggs
Analysis of Recreational Fishing Surveys and Data
Although recreational fishing has
grown immensely in importance
during the past thirty years, its
national survey, MRFSS, has seen
few revisions during this time. James
plans to study the MRFSS survey,
investigating (1) the sound
interpretation of past data and
(2) strategies for improving design
in the future.
Bonnie with a hatchling
A baby loggerhead crawling to the ocean for the first time
Melissa excavates a nest to count the number of hatched eggs
An adult loggerhead
Fishing on a headboat
Sea turtle interactions with the pelagic longline fishery: estimating number of bycatch events and post-interaction mortality
Leatherback and loggerhead sea
turtles are caught incidentally in the
longline fishery, which targets tuna
and swordfish, and the NOAA
Fisheries Service is responsible for
estimating the number of threatened and endangered sea turtles caught. She will use simulation modeling to compare bycatch estimates using different mathematical models to test which methods work best under a range of scenarios. Results will be used to provide improved estimates of sea turtle mortality.
Jim with a Grouper
Shrimp bycatch in the Gulf of Mexico
The Gulf of Mexico shrimp fishery catches and
discards large numbers of non-targeted fish
species (bycatch). The NOAA Fisheries
Service began an observer program on shrimp
trawlers in 1992 to estimate shrimp and
bycatch catch rates and the effectiveness of
methods to reduce bycatch. Her project will analyze this dataset and estimate the bycatch of a number of important fish species.
A loggerhead sea turtle caught as bycatch in the longline fishery
Bycatch examples: Lane Snapper and Triggerfish
Paige fishing onboard a headboat
Learning about loggerheads injured by the longline fishery
Shrimp trawl catch: more than just shrimp!
Commercial shrimp trawler
Biased length frequencies in fisheries stock assessment
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
Juvenile Gag grouper
Black Sea Bass
Life history and stock assessment of hammerhead sharks in the Gulf of Mexico and northwest Atlantic Ocean
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