A common marking method influences fish-parasite interactions

Visible Implant Elastomer (VIE) marking in Poecilia reticulata is linked to a ~3.7-fold higher Gyrodactylus turnbulli parasite burden one month after experimental infection.

• Why it matters: Identifying the same moving fish over time often requires artificial marks, yet marking effects may be missed if studies only track survival, growth, or behavior.
• What they did: Using 26 VIE-marked and 46 control guppies, the study compared parasite burden and transmission after experimental infections at one and two months post-marking.
• The result: One month after marking, VIE-marked fish carried more parasites, and two months later parasites transmitted faster to VIE-marked fish, while subsequent growth did not differ.

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