Eucinostomus argentus (silver Mojarra)

[duanes]

This is the 3rd individual I´ve caught during the last month or so (it is the rainy season here), and the 1st one to survive beyond 3 days in my tank, (granted the ones before were added to a tank that turned out to be plagued by Lernaea.
Before adding the latest Eucinostomus, the tank had been treated with Prazicuantel, and a brought salinity of 3 ppt, and sat fish less, for a month before this individual was added.
All mojarra were caught in the Rio Mamoni (a large river) far from the sea,) the Rio Uni, and Rio San Juan, both smaller streams also quite far upstream from the sea.


It is about 4¨ TL (10 cms), and at the moment housed with 2 similar sized Gobiomorus dormitor caught in the same river, in a 180 gal (6ft) tank.

All have been captured in fast moving riffle areas,


Water temp around 80´F. undetectable nitrate, and pH above 8.



Other species caught in all 3 rivers were Characins such as Roeboides, and Astyanax, but non kept, because many commonly carry the Lernaea parasite.

 

[duanes]

One of the thing I find interesting about this fish, is that its can be found in salt, brackish, and fresh water.
It can be found along the coast as far north as New Jersey, and Californa, and as far south, as southern Brazil in the Atantic, and Peru in the Pacific.

 

[tlindsey]

One of the thing I find interesting about this fish, is that its can be found in salt, brackish, and fresh water.
It can be found along the coast as far north as New Jersey, and Californa, and as far south, as southern Brazil in the Atantic, and Peru in the Pacific.
View attachment 1570321View attachment 1570322

I like the way it looks..

 

[duanes]

It kind of reminds me of a tin foil barb, but would be a much better addition when trying to keep to a geographically correct biotope aquarim for new worlds.
Especially when one considers its average size of 6¨ -8¨ when compared to the tin foil bars 12" to 14".

 

[duanes]

Wanted to keep an accurate growth measurement record..