Yesterday, first collecting day ......

We went out of Iquitos, followed the road (the only one in the area) to Nauta, and walked to this biotop:

Beneath the surface it looks like this:

pH: 5,06  Conductivity: 18 microSiemens/cm  Temperature: 27,2 °C

The first fish, caught with a hand net, was a female Apistogramma sp."Schwarzbrust"
(Update: Described by Römer, Duponchelle, Diaz, Davilla, Sirvas, Catchay & Renno in 2011, and given the name
Apistogramma cinilabra):

With a bigger net, we also got males:

We went to the next biotop; a restwater pool where the locals had cut down the surrounding vegetation:

pH: 5,32  Conductivity: 10 microSiemens/cm  Temperature: 30,2 °C

We got some nice Apistogramma sp. "Masken" (Update: Described by Römer et al. in 2013, and given the name
Apistogramma paulmuelleri). This is males:

and a female:

Then another biotop, just about 20 km from the city of Iquitos:

Blackwater!

Remember, this is the end of the dry season, not much water left:

The ground is fine, white sand with lots of leaf litter

Beneath the surface:

pH: 3,80 (!)  Conductivity: 59 microSiemens/cm  Temperature: 29,1 °C

In the left bottom corner, there is an Apistogramma!

Beautiful Apistogramma atahualpa:

We also got many beautiful Pyrrhulina (cf.) spilota in the net:

and some Rivulus sp. in this water :

Today we are preparing for the next expedition; tomorrow we will go to Mazan and up the Rio Napo.