[Peter Finke]

Dear Svein, thank you for your informations. I do not understand what you mean by brutto and netto temperature. It’s quite a difference …
Commercial senders in Germany use heatpacks equally to your usage quite successfully and without (severe) losses. But within Germany’s borders only. As you say: Sending fish across the European borders could be risky because of time. Mostly this needs three, four or more days (and nights). Especially during winter time this is not advisable. That’s a problem: At present, we have some six or eight breeders here in our country with many young fish of five or six species, but there are more interested friends outside of the country’s borders than inside…
Horst Linke told me of a new material better than styropor, but he obviously has not yet the details of the manufacturer. I think, shipping Paro’s is in Europe predominantly a matter of temperature. It’s no matter of space at all and nearly no matter of oxygen. But getting too cold could be desastruous. We had that problem here with our first sendings in October: An unprecedented sharp decline of temperature killed many fish. But even if you restrict yourself to the summer half of the year: A shipping that extends more than two or three days could always include a temperature-risk. The heatpacks could certainly minimize the problem, but their proper use needs experience.