Data used in the estimation of biomass levels in individual ecosystems are derived from state and academic surveys. Much of the data are available online. The relevant surveys, and contact are:

ChesMAPP. Baywide trawl survey of Chesapeake Bay conducted by faculty, students and staff at the Virginia Institute of Marine Science. http://www.vims.edu/research/departments/fisheries/programs/multispecies_fisheries_research/chesmmap/index.php

Delaware Bay Trawl Survey. Baywide survey of Delaware Bay conducted by the Delaware Division of Fish and Wildlife. http://www.dnrec.delaware.gov/fw/SiteCollectionDocuments/FW%20Gallery/Research/trawl%20doc.pdf

Long Island Sound Survey. Conducted by staff at the Connecticut Department of Energy and Environmental Management in CT waters of Long Island Sound. http://www.ct.gov/DEep/cwp/view.asp?a=2696&q=322660&depNAV_GID=1647

NMFS Bottom Trawl Survey. Conducted by NOAA Fisheries scientists in the Ecoystems Survey Branch in the northwest Atlantic coastal shelf since 1963. http://www.nefsc.noaa.gov/femad/ecosurvey/mainpage/

Rhode Island Trawl Survey. Conducted by faculty, students and staff of URIs Graduate School of Oceanography at a limited number of stations in Narraganset Bay. http://www.gso.uri.edu/fishtrawl/

VIMS Juvenile trawl survey. A long term trawl survey of Virginia waters of the Chesapeake Bay conducted by scientists at the Virginia Institute of Marine Science. http://www.vims.edu/research/departments/fisheries/programs/juvenile_surveys/index.php