Loggerhead sea turtle nesting beach survey and population model development
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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 Hedges

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

James Thorson

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

Paige Barlow

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

Bonnie Coggins

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

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


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