1. mark feldman on August 21, 2021 at 1:14 am

    Why was there a steep decline in numbers between 2017-2019?

    • Vincenzo Ferri on August 29, 2021 at 2:06 am

      Dear Mark,
      Several hypotheses:
      1. Eradication work carried out on the sly by municipal workers.
      2. In March 2018, several dead individuals were found near the banks, suggesting that epidemics broke out during the two winters (Aeromonas?).
      3. Another hypothesis concerns the continuation of the cold weather into the spring months of 2018 with cachexia in individuals abandoned in the autumn.

  2. Vincenzo Ferri on August 29, 2021 at 2:14 am

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