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Site XY [U.S. Fish and Wildlife Service]

U.S. Fish & Wildlife Service · 2021 Full Details

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Full Details

Title
Site XY [U.S. Fish and Wildlife Service]
Description
Ichthyoplankton (larval fish) surveys are a component of the U.S Fish and Wildlife Services (USFWS) Lower Great Lakes Fish and Wildlife Conservation Office (LGLFWCO) Aquatic Invasive Species (AIS) Early Detection and Monitoring (EDM) program. Larval fish surveys were included in the EDM program starting in 2014 with the hopes of increasing AIS detections by focusing on sampling the most abundant life-stage of fishes. Surveys occurred annually from 2014 - present, excluding 2020 due to COVID-19 restrictions which prevented sampling for that year. Sampling focuses on harbors and rivers of the lower Great Lakes (Erie and Ontario) as determined by a risk-based prioritization framework for AIS in the Great Lakes . Samples are collected using larval seine nets (500 µm) and plankton nets (500 µm) that are towed from the stern or pushed from the bow of a vessel for a short duration (usually 5 minutes). At one point, light traps were also used but are no longer apart of the current sampling gear suite. Samples are preserved using 95% ethanol (EtOH) which allows for tissue and DNA preservation. Samples are processed for fish identification in a few different ways: ethanol decant, tissue homogenate and taxonomically. Ethanol decant and tissue homogenizing are genetic identification methods that are provided by the Northeast Fishery Center (NEFC). Taxonomic identifications are conducted in-house (LGLFWCO) using available keys for larval fishes of the Great Lakes region. Recently, ethanol decants have been the primary method of identification due the efficiency of sample processing. The information within this dataset is geospatial in nature and documents larval fish sampling events. Both abiotic and biotic data is collected for each individual sampling event. Taxonomic and genetic identifications of eggs and larvae are to the lowest possible taxa. Genetic identification results only represent presence/absence of a species detection. Taxonomic identification results could include the number of species in the sample. Although infrequent, some early stage juvenile fish are represented in this data set. This data set contains survey information from 2017 - present (excluding 2020). Although collections began in 2014, the early years of implementation resulted in inconsistencies requiring their exclusion here.
Creator
U.S. Fish & Wildlife Service
Temporal Coverage
Last Modified: 2021-04-06
Date Issued
2021-02-26
Rights
The United States Fish and Wildlife Service (Service) shall not be held liable for improper or incorrect use of the data described and/or contained herein. While the Service makes every reasonable effort to ensure the accuracy and completeness of data provided for distribution, it may not have the necessary accuracy or completeness required for every possible intended use. The Service recommends that data users consult the associated metadata record to understand the quality and possible limitations of the data. The Service creates metadata records in accordance with the standards endorsed by the Federal Geographic Data Committee. As a result of the above considerations, the Service gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of the data. It is the responsibility of the data user to use the data in a manner consistent with the limitations of geospatial data in general and these data in particular. Although these data have been processed successfully on a computer system at the Service, no warranty, expressed or implied, is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. These data are preliminary or provisional and are subject to revision. They are being provided to meet the need for timely best science. The data have not received final approval by the Service and are provided on the condition that neither the Service nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the data. This applies to the use of the data both alone and in aggregate with other data and information.
Access Rights
Public
Format
ArcGIS FeatureLayer
Language
English
Date Added
August 10, 2025
Provenance Statement
The metadata for this resource was last retrieved from U.S. Fish and Wildlife Service Open Data on 2025-08-24.

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Cite and Reference

  • Citation
    U.S. Fish & Wildlife Service (2021). Site XY [U.S. Fish and Wildlife Service]. . https://gis-fws.opendata.arcgis.com/datasets/fws::site-xy (web service)
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