All I know, is that is where Linke and Staeck collected at that moment in time.
And it looks to be during the dry season, according to the date.
Here in Panama, the pH and mineral content rise sightly during the dry season, as water bodies evaporate and shrink, although tannins accumulate.
During the rainy season with influx of soft water from rain, pH drops somewhat, and minerals are diluted.
Notice in their data, the water color was "brown" indicating (to me) lots of tannins, from fallen leaf litter.
The tint in your pics looks slightly brown, added tannins?
If so, sounds like a good idea to me.
Their water hardness test is quite low, in US terms 4dH is equivalent to 40 ppm.
In Milwaukee, my average tap water hardness was 250 ppm.
On a side note, from their data,
the number of anal fin spines for H. temporalis, is 7 to 8.
In coryphanoides, there are only 6.
And it looks to be during the dry season, according to the date.
Here in Panama, the pH and mineral content rise sightly during the dry season, as water bodies evaporate and shrink, although tannins accumulate.
During the rainy season with influx of soft water from rain, pH drops somewhat, and minerals are diluted.
Notice in their data, the water color was "brown" indicating (to me) lots of tannins, from fallen leaf litter.
The tint in your pics looks slightly brown, added tannins?
If so, sounds like a good idea to me.
Their water hardness test is quite low, in US terms 4dH is equivalent to 40 ppm.
In Milwaukee, my average tap water hardness was 250 ppm.
On a side note, from their data,
the number of anal fin spines for H. temporalis, is 7 to 8.
In coryphanoides, there are only 6.