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Since I would like to use the salinity data with lat/lon in the Gulf of St. Lawrence, Canada to compare with the fishing data. I'm trying to download the 2010-2019 average salinity data. As the table in this database showed. (https://www.arcgis.com/home/webmap/viewer.html?url=https%3A%2F%2Fgisp.dfo-mpo.gc.ca%2Farcgis%2Frest%2Fservices%2FFGP%2FTeleost_BottomTemperatureSalinityFond%2FMapServer&source=sd)

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In QGIS you can load the data directly. Using connect to ArcGIS MapServer in the browser window.

https://gisp.dfo-mpo.gc.ca/arcgis/rest/services/FGP/Teleost_BottomTemperatureSalinityFond/MapServer

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They have not enabled download through the ArcGIS Online, which would have been simplest. You need to add a link to their server in ArcGIS Pro.

If you click on the link in their open portal site:

link

It takes you to the metadata page, in the address bar is the server location:

address

Add that to ArcGIS Pro or ArcMap, ArcGIS Pro is much easier to use...

in pro

Drill down to your layer of interest and add to map so here is 2019 salinity

data

If you try to export the data it won't allow you, they have in their wisdom disabled that, not sure why one would share data and then not allow you to export it... They are also symbolizing this continuous surface as a polygon layer, a bit weird, would normally be raster. But the information you seek seems to be in the attribute table so you can export that using the table to table tool or table to Excel for example.

Here are the first 65 rows exported to an in-memory table to prove it works: output

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