So, me being me, I came home and Googled it to see if it has meaning. Lo and behold! Here is a quote taken from
Fisheries and Oceans Canada runs a Storm Drain Marking Program.
Storm Drains can have yellow fish painted beside them to remind us
that storm drains on our roadways empty directly into local streams. We
need to keep harmful things out of the the storm drains. Contact Fisheries and Oceans Canada for more information.
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