Parent Layer:
Fish Survey data
Name: Herring Spawning Habitat
Display Field: HERRING_PRESENCE_DETECTED
Type: Feature Layer
Geometry Type: esriGeometryPoint
Description: This layer contains information on river herring (alewife, Alosa pseudoharengus and blueback herring, Alosa aestivalis) spawning habitat surveys conducted by the Smithsonian Environmental Research Center (SERC) Bay (M. Ogburn, SERC, unpublished data). Surveys were conducted at 27 sites in the Choptank River and its tributaries from March-May 2016; each site was visited 1-3 times. The presence of river herring adults and/or icthyoplankton, which is an indication of spawning activity, was determined in three ways: 1) visual observation of adult river herring, 2) capture of adult river herring by cast net, or 3) presence of likely river herring eggs or larvae in ichthyoplankton samples (which could also include hickory shad eggs). Ichthyoplankton samples were taken for five minutes following the standard methods used by MD DNR. This layer shows points where surveys have been conducted in the Choptank and whether adult and/or icthyoplankton river herring were observed.
Copyright Text: Smithsonian Environmental Research Center
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Spatial Reference: 26985
(26985)
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Type ID Field: null
Fields:
-
LATITUDE
(
type: esriFieldTypeDouble, alias: Latitude
)
-
LONGITUDE
(
type: esriFieldTypeDouble, alias: Longitude
)
-
HERRING_PRESENCE_DETECTED
(
type: esriFieldTypeString, alias: Herring Present Detected, length: 255
)
-
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type: esriFieldTypeOID, alias: OBJECTID
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type: esriFieldTypeGeometry, alias: Shape
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