Maine Department of Marine Resources Inshore Trawl Survey 2000-2019

Sampling event
Latest version published by United States Geological Survey on Jun 28, 2022 United States Geological Survey

Download the latest version of this resource data as a Darwin Core Archive (DwC-A) or the resource metadata as EML or RTF:

Data as a DwC-A file download 3,851 records in English (6 MB) - Update frequency: annually
Metadata as an EML file download in English (7 KB)
Metadata as an RTF file download in English (8 KB)


The Maine-New Hampshire Inshore Trawl Survey is a fishery-independent survey operated by Maine Department of Marine Resources that started in the fall of 2000. The survey is a collaborative partnership between commercial fishermen and state researchers to assess inshore fish stocks along the coast of Maine and New Hampshire. The survey occurs twice a year, in the spring and fall, and covers about 4500 square miles. A more detailed description and protocols for the survey can be found here. Reports and publications from the ME-NH trawl survey can be accessed here.

Survey Design The ME-NH survey is a stratified random survey, separated into four depth strata and five geographic regions along the coast of Maine and New Hampshire. The inner boundary is defined by the shallowest depth that the 55-ft survey vessel can effectively sample (about 5 meters) and the deeper boundary loosely follows the 12 mile limit. One hundred and twenty stations are randomly selected for sampling before the start of each spring survey. The randomly selected sites that were successfully sampled in the spring are resampled again in the fall. The goal is to complete one, twenty minute, tow using a modified shrimp net at each randomly selected station. However, sometimes due to bottom the tow is moved or shortened. After the tow is completed, the catch is brought on board and sorted by species. The total weight of each species is weighed and then lengths are measured. Most species are measured to the nearest centimeter, except for lobsters, scallops, and urchins which are measured to the nearest millimeter. Finfish are measured for total centerline length, lobsters and northern shrimp for carapace lengths, crab species for carapace width, scallops for shell height, squid for mantle length, and octopi are measured out to the longest arm. If there is a large catch of a species a subsample is taken and 100 individuals are randomly selected for measurement. Selected species are sampled for maturity and age samples each survey.

Data Records

The data in this sampling event resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 3,851 records.

2 extension data tables also exist. An extension record supplies extra information about a core record. The number of records in each extension data table is illustrated below.

Event (core)

This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.


The table below shows only published versions of the resource that are publicly accessible.

How to cite

Researchers should cite this work as follows:

Rebecca Peters. Maine Department of Marine Resources Inshore Trawl Survey, 2000 – 2019. 2022. Maine Department of Marine Resources, PO Box 8, West Boothbay Harbor, Maine 04575.


Researchers should respect the following rights statement:

The publisher and rights holder of this work is United States Geological Survey. This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: eef4456e-e582-42a0-8b69-3297e86129ae.  United States Geological Survey publishes this resource, and is itself registered in GBIF as a data publisher endorsed by U.S. Geological Survey.



External data

The resource data is also available in other formats

Maine DMR Trawl Survey Portal ASCII Shiny App Portal


Rebecca Peters
  • Metadata Provider
  • Originator
  • Point Of Contact
Marine Resource Scientist
Maine Department of Marine Resources
Abby Benson
  • Publisher
U.S. Geological Survey
Katerina Ozment
  • Processor
University of Tennesee

Geographic Coverage

Maine and New Hampshire

Bounding Coordinates South West [42.618, -72.158], North East [45.46, -66.489]

Additional Metadata