[Drago]

But even more important than agriculture they worry about boats having water pooled in the bottom and not drained that might have fry or eggs from an invasive species.
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Yeah that's Quagga & Zebra Mussels usually...bad news:

https://cisr.ucr.edu/invasive-species/quagga-zebra-mussels

https://www.nps.gov/lake/learn/quagga-mussel.htm

https://www.watereducation.org/aquapedia-background/quagga-mussel

[Openurmind]

Yes, and Mussels thank you. :)