Maine Department of Marine Resources Inshore Trawl Survey 2000-2009Entry ID: ME_DMR_Trawl
Abstract: The Maine-New Hampshire Inshore Trawl Survey is conducted twice a year, for five weeks at a time, always starting in New Hampshire and ending off Grand Manan. The spring surveys start the first week of May, and the fall surveys start the first week of October. Data collected by the survey include: (1) Fish and invertebrate weights and lengths, (2) Biological measures (sex, maturity, age) for ... selected species, (3) Icthyoplankton samples (fish eggs and larvae), ended in 2004, and (4) Oceanographic data (salinity, temperature, depth).
The survey has a stratified random design with a fixed component. The inshore areas sampled are divided into four depth strata, out to approximately the 12-mile limit. Strata 1: 5-20 fathoms. Strata 2: 21-35 fathoms. Strata 3: 36-55 fathoms. Strata 4: 56+ fathoms
The coast is also divided into five longitudinal regions based on oceanographic, geologic and biological features. Together, 20 separate strata exist.
The total survey area is approximately 4,617 square nautical miles. A target of 115 stations is selected for sampling each survey, resulting in a sampling density of 1 station for every 40 NM2. Of those 115 stations, 20 of them are fixed stations, sampled each survey. There is 1 fixed station per stratum, either designated due to its historical importance and representative nature or chosen at random. The remaining 100 stations are chosen at random.
The F/V Robert Michael, a Down East 54 out of Portland, Maine, is the primary vessel used for this survey. It is owned by Robert Tetrault and Captained by Rob Tetrault II. In addition, a virtually identical sister ship, the F/V Tara Lynn, Captained by Sam Galli, has been used by the survey as well. The survey utilizes a modified version of the shrimp net used in Maine waters. It was designed by the vessel owner and net designer Jeff Flagg to fish for a variety of near-bottom dwelling species without targeting any specific component. It has a 2-inch mesh, with a 1-inch mesh liner in the cod end. The net is outfitted with the NetMindTM trawl monitoring system manufactured by Northstar Technical. This sonar system allows continuous monitoring of net dimensions during towing to assess consistency, maintain quality control, and provide swept area for biomass calculations.
Purpose: To provide data to state and federal fisheries managers on a variety of managed finfish and shellfish for the inshore Gulf of Maine, along the coasts of Maine and New Hampshire. The data is used in stock assessments and other regulatory processes.
Data was published in 2010 on the OBIS-USA web site and is available at http://www.usgs.gov/obis-usa
Record Count 38661, Taxa Count 147
Spatial Data Organization Information - Indirect Spatial Reference: Inshore Gulf of Maine, Direct Spatial Reference: point
Geodetic Model: Horizontal Datum Name: North American Datum 1983
Data Set Citation
Dataset Originator/Creator: Sally Sherman
Dataset Title: Maine Department of Marine Resources Inshore Trawl Survey 2000-2009
Dataset Release Date: 2010
Dataset Release Place: P.O. Box 8, West Boothbay Harbor, Maine 04575.
Dataset Publisher: Maine Department of Marine Resources
Data Presentation Form: Database
Other Citation Details: Retrieve from http://www.usgs.gov/obis-usa
Start Date: 2000-10-30Stop Date: 2009-11-05
OCEANS > OCEAN TEMPERATURE > THERMOCLINE
OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE
OCEANS > SALINITY/DENSITY > SALINITY
OCEANS > AQUATIC SCIENCES > FISHERIES
BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > FISH
BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES
BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ARTHROPODS > CRUSTACEANS > DECAPODS
BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ARTHROPODS
BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > CNIDARIANS
BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ECHINODERMS
BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > MOLLUSKS
Quality Data is proofed by hand and edited for outliers by computer. Drop down lists and lookup tables used for input, no tests used. All data and comments entered into database. DGPS coordinates within system accuracy.
Access Constraints To view constraints placed on dataset, please see Policies and Disclaimer section (from the panel on the left) on OBIS-USA web site at http://www.usgs.gov/obis-usa.
DISTRIBUTION LIABILITY: OBIS-USA renders information prepared by contributors accessible through dynamic on-line publication. It does not peer-review the quality of the data provided. However, it is confident that the data ... are the best available in electronic form. OBIS-USA does not own or try to control or limit the use of any data or products accessible through its website. Accordingly, it does not take responsibility for the quality of such data or products, or the use that people may make of them.
Users must recognize that the analysis and interpretation of data requires background knowledge and expertise about marine biodiversity (including ecosystems and taxonomy). Users should be aware of possible errors in the use of species names, geo-referencing, data handing and mapping. They should crosscheck their results for possible errors, and qualify their interpretation of any results accordingly. Appropriate caution is thus necessary in the interpretation of results derived from OBIS-USA.
Use Constraints Prior to use of these records in any analysis or report, Maine Department of Marine Resources must be notified and if used the provenance of the original data must be acknowledged. Acknowledge the use of specific records from contributing Maine DMR databases and acknowledge the use of the OBIS-USA facility. Recognize the limitations of data in OBIS-USA.
Data Set Progress
Distribution Media: Annual reports available online. Data CD's available on request from Maine DMR.
Distribution Format: ASCII (ORACLE database)
Distribution Media: Data download from Obis-Usa
Distribution Format: Text
Role: TECHNICAL CONTACT
Email: sally.sherman at maine.gov
PO Box 8
City: W. Boothbay Hbr.
Province or State: Maine
Postal Code: 04575
Country: United States of America
Creation and Review Dates
DIF Creation Date: 2005-02-15
Last DIF Revision Date: 2012-02-01