An interesting Collecting day

[duanes]

Being the rainy season, an easy escape route must be considered, in case walls of water surge down from the mountains, so we park partially up the bank so not to be caught pants down.
The Mamoni allowed for that access yesterday, and it was an interesting day to collect in the shallows, in the deeper sections, the flow was quite strong, and the fish seemed to want to stay out of the raging current.
3 individuals cichlids were found over about 3 hours, only Darienheros, no others from the cichlid family.

Too large to keep, and/or maintain, so released were a Robalo (genus Centropomus)

a predatory Goby,

and a large Macrobrachium shrimp.

Kept , and brough home, were a couple tiny flounders (slightly over an inch) that disappeared ing my sump

And this (what I think is) Eugerrus or Euctinostomus.

These last two species are usually found in brackish water, but the area is quite far upstream from the sea.
The color of the water was chocolate brown, pH slightly below 8, and yet nitrates remained undetectable.

 

[tlindsey]

Being the rainy season, an easy escape route must be considered, in case walls of water surge down from the mountains, so we park partially up the bank so not to be caught pants down.
The Mamoni allowed for that access yesterday, and it was an interesting day to collect in the shallows, in the deeper sections, the flow was quite strong, and the fish seemed to want to stay out of the raging current.
3 individuals cichlids were found over about 3 hours, only Darienheros, no others from the cichlid family.

Too large to keep, and/or maintain, so released were a Robalo (genus Centropomus)

a predatory Goby,
View attachment 1567162
and a large Macrobrachium shrimp.

Kept , and brough home, were a couple tiny flounders (slightly over an inch) that disappeared ing my sump

And this (what I think is) Eugerrus or Euctinostomus.

These last two species are usually found in brackish water, but the area is quite far upstream from the sea.
The color of the water was chocolate brown, pH slightly below 8, and yet nitrates remained undetectable.

duanes I wonder if the flounder's are the same species sometimes sold in the aquarium trade.

 

[duanes]

According to FishBase, Citharichthys gilberti, Achirus mazatlanus, and Trinectus maculatus and fluviatilis, are all found here, in fresh, and brackish water, and.
Since they are both tiny, I expect they are still in juvie coloration, so I´m pretty clueless about IDs.
These are the first flounders I ´ve caught here, and they have disappeared into the jungle of plants in the sump.
Maybe someone with more expertice can chime in?

 

[jjohnwm]

And this (what I think is) Eugerrus or Euctinostomus.

That ^ is a very pretty and very interesting fish. Schooling, I assume? Did you keep any of these? Do they get large?

Oh, and...why do you collect with your pants down?

 

[duanes]

Haven´t seen either of the two flounders since they were let go into the sump Saturday, , but today while vacuuming and stirring thing up in bthe sump, one appeared for a split second.

 

[HUKIT]

And this (what I think is) Eugerrus or Euctinostomus.

Do you see the Eugerres brasilianus in large numbers? A large school of these would look amazing in a large system.

 

[duanes]

I agree about a large school.
The one above is the 1 st one I´ve netted, Dani got one too, but it went belly up on the way home.

 

[duanes]

 

[duanes]

Went back to collect again yesterrday, first to the Rio Uni, where two 6¨ Pimelodus catfish where landed, a few Darenheros cichlids, and lots of Roeboides tetras and some Gobiomorus were caught.
The tetras and gobiomorus were all released, I already have plenty of tetras, and since they Gobiomorus are the apex predatores of the river they become to dangerous to keep with the others in a communuity tank.


The cats immediately disappeared under logs in the tank, so I was unable to get a clear puc, but similar one caught in the same river a few years back (above).
After leaving the Uni we had enough time to spend another 2 hours at the Rio Mamoni.
I wanted to try to find another Mojarra (Eugerres), the river was even faster flowing tha a couple weeks back.
I did manage to net one, and grab some rudamentary shots when back home.


But by morning it had disappeared from the tank.
Dani netted another flounder, and a couple Chaetestoma Plecos.

I only managed to net a few tetras (also released) and a couple 12¨Mugel cephalis (mullet) which Dani took home for dinner.

 

[phreeflow]

Did the mojarra ever reappear from hiding or was it eaten? Those tetras look nice, especially the ones with the red finnage