Federal Environment Minister Steffi Lemke (Greens) travels to the Oder because of the fish kill.
On Saturday evening at 6 p.m. in Frankfurt (Oder), she wants to speak to emergency services, for example from the fire brigade and technical relief organization, as the ministry announced.
There, helpers had collected many dead fish from the shore.
According to the Federal Environment Ministry, Brandenburg's Environment Minister Axel Vogel (Greens) and Frankfurt's Lord Mayor René Wilke (Left) are also expected to attend the meeting.
According to her department, Lemke had exchanged views with her Polish counterpart on Friday and agreed on a close exchange of information.
Criticism came from Lemke's house on Friday that Poland had not warned in time.
"In fact, we know that this reporting chain, which is intended for such cases, did not work," said a spokesman.
Brandenburg had also openly criticized that they had not been informed by the Polish authorities.
Water samples in preparation
The environmental catastrophe is meanwhile spreading further and further.
The Ministry of the Environment in Mecklenburg-Western Pomerania expects the effects of the fish kill in the Oder on the Szczecin Lagoon.
It is to be expected that the loads will already reach the mouth of the Oder near Szczecin (Poland) in the evening, depending on wind and current conditions, the ministry wrote in a statement late on Friday evening.
In the course of Saturday, the Western Pomeranian part of the Szczecin Lagoon could also be affected.
As a precaution, the Ministry of Till Backhaus (SPD) therefore called on residents to refrain from fishing in and taking water from the body of water – regardless of use.
The responsible authorities in Mecklenburg-Western Pomerania are currently preparing water and fish samples.
The investigations into the clarification of the fish kill are ongoing.
Previous laboratory analyzes did not bring any precise information about the pollution of the water and the causes.
Environmental politicians and conservationists rated the fish kill as an environmental disaster.
"Very much increased salt loads"
According to information from Brandenburg's Environment Minister Axel Vogel, the Oder has "very much increased salt loads".
That was "absolutely atypical," said the Green politician on Friday evening on RBB television.
Vogel's ministry said the measured salt loads could be related to the fish kill.
"According to current knowledge, however, it will not be a single factor that caused the fish kill in the Oder," it said in a statement.
The term salt loads refers to salts dissolved in the water.
The ministry explained in the evening that these are the first further results from the Berlin-Brandenburg state laboratory for the daily samples that were taken at the automatic measuring station in Frankfurt (Oder) by Friday.
The results are "not yet fully meaningful and not conclusive".
Further investigation data "in particular on heavy metals, mercury (in other samples) and other elements" are still being clarified in the laboratory and should be available in the coming week.
"Today's data indicate multi-causal relationships, including the currently very low discharge rates and high water temperatures."