Revision of Maine Inshore Trawl from Thu, 2015-02-26 13:23
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Overview:
Fish and macroinvertebrate abundance and size data collected for reefs and seagrass habitats surounding St. John in the United States Virgin Islands (USVI) by the Center for Coastal Monitoring and Assessments Biogeography Team are available at OBIS. The OBIS compiled data includes species name, individual count, lat/lon, and some environmental correlates like depth and salinity.
Dataset Location: OBIS St. John USVI Fish Assessment
Direct Download: OBIS St. John USVI Fish Assessment
Site Location: St. John
Site(s) Georeferenced: Yes
Timespan: 2000 - 2009
Sampling Frequency: biannual; first week May and first week October
Data Collection Summary / Methods: Stations are chosen for a stratified random design of 115 stations, 20 of which are fixed stations sampled each survey. The sampled areas are divided into 20 strata with four depth strata and five longitudinal regions based on oceanographic, geologic and biological features. Each strata includes once fixed station. The total survey area is approximately 4,617 square nautical miles with 1 station for every 40 NM2.
A modified shrimp net is used to sample 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. A sonar system continuously monitors net dimensions during towing to assess consistency, maintain quality control, and provide swept area for biomass calculations.
Data collected: Fish and invertebrate species ID, weight length. Some species include sex, maturity, age. Oceanography.
OBIS data schema: species name, individual count, date, location, temperature, depth, salinity, nitrogen, oxygen, silicate.
Known Issues: Ichtyoplankton (fish eggs and larvae) collection ended in 2004.
Best Practices: tips for separating the wheat from the chaff
Conditions for use: 'freely available' and 'open-access' as per OBIS: http://iobis.org/about/vision
Citation/ Distributing Authors: David A. Libby. Maine Department of Marine Resources Inshore Trawl Survey, 2000 – 2009. 2010. Maine Department of Marine Resources, PO Box 8, West Boothbay Harbor, Maine 04575.
Supplemental resources:
Available via the EcoData Retriever: No