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SMAST researchers employ new methods of fish geolocation

October 9, 2015 — Researchers at the UMass Dartmouth School for Marine Science and Technology are hoping that new methods of figuring out where fish go in the Gulf of Maine will begin to lead to a much better understanding of what is happening below the surface, aiding in stock assessments.

Dr. Geoffrey Cowles and his research assistants, graduate students Doug Zemeckis and Chang Liu, are partners in a multi-institution effort to tag yellowtail flounder, monkfish, and now cod to learn much more than past methods could tell them.

Called geolocation, the multi-partner research is using new measurements to begin to sort out where fish go after they are tagged and before they are (hopefully) recaptured.

Zemeckis went to sea on a state research vessel, and tagged dozens of cod with lipstick-sized devices that record temperature and pressure. Those can tell researchers quite a lot about where the fish spend their time.

Unlike simple tags, which just show where the fish was released and where it was caught, these devices record the data, which is being recovered and analyzed using methods that are still being developed.

Zemeckis said that since GPS signals do not penetrate water, global positioning doesn’t work for tracking fish.

Read the full story from the New Bedford Standard-Times

UMass Dartmouth researchers developing open-source system for assessing fish movement

October 7, 2015 — UMass Dartmouth School for Marine Science & Technology (SMAST) Associate Professor Geoffrey Cowles is leading a collaborative research effort to develop geolocation methodologies to improve understanding of fish movement patterns of Atlantic cod, yellowtail flounder, and monkfish. The project will focus on the Gulf of Maine/Georges Bank and includes researchers from SMAST, Northeastern University, the Gulf of Maine Research Institute, the Massachusetts Division of Marine Fisheries, along with the fishing industry.

Geolocation, which is the process of taking data recovered from a fish archival tag and coming up with the best estimate of positions between release and recapture, can provide insights into catchability and fishery interactions. Using this technique, the research team will be able to guide behavior-dependent aspects of the model parameterization, as well as interpret the geolocated tracks. Researchers will also employ their collective skills in computer programming, oceanographic modeling, statistical analysis, and fisheries biology to assist in furthering the development of technology to geolocate fish.

This study will also use data acquired from previous studies on each of the example species, which all have their own characteristic behaviors and were tagged in different areas of the Gulf of Maine and Georges Bank region. Most studies of fish movements have relied on fishery recaptures of conventional tags, which provide only the locations of release and recapture. Such tagging studies may bias perceptions of movement patterns.

Archival tags, which are attached to fish internally or externally to record temperature and pressure at regular intervals, enable estimations of fish location while at large. This type of information is often not fully utilized due to the technical difficulties of producing such movement histories via geolocation techniques.

Read the full story at the New Bedford Standard- Times

 

NOAA recommends $900K for UMass Dartmouth fisheries research

June 26, 2015 — WASHINGTON – The National Oceanic and Atmospheric Administration has recommended a dozen Massachusetts-based marine research programs receive funding this year including more than $900,000 for UMass Dartmouth to conduct four projects whose aim is to  improve the cost-effectiveness and capacity of programs to observe fish.

Some of the money will be used to maximize fishing opportunities and jobs; increase the quality and quantity of domestic seafood; and improve fishery information from U.S. territories.

The programs will be conducted through the Saltonstall-Kennedy Grant Program.

The Department of Commerce must still sign off on the projects before applicants will receive funding.

Read the full story at New Bedford Standard-Times

 

 

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