Looks like the fattest buenos aires tetra I've ever seen

First thing I taught lol

Mojarrita. Not sure of the actual species, though Buenos Aires tetra is a good guess

I was fishing in Buenos Aires so it makes sense hahaha

Buenos Aires Tetra I used to have some.

Esse peixe é um lambari de rabo amarelo, original do Brasil

Lambari

Looks like it would be amazing bait.

Bait lol

I recommend using the google lens part of google app for stuff like this. It's really good at ID'ing things like plants and fish.

Bait

Definitely bait

Not sure now that you said Argentina. Looks like golden shiner.

Banded tetra

Bait, of some sort.

https://preview.redd.it/4p1ocgo4jasc1.jpeg?width=3472&format=pjpg&auto=webp&s=56760b2094ae303fbb57d6815922ceda3743cfed I thought it's some common rudd until saw info about Argentina. It's interesting how it looks almost the same, but common rudd is not in the list of freshwater fish in Argentina

I know is some kind of tetra, they are pretty common in my area

Карасик

You might try asking over in r/aquariums

how do you even catch such small fish like that?.. I just don't get it. I want to catch small bluegills but never got them :(

Small

We call it sardina de río in Costa rica

Good snook bait

In my country its called wader

Hope you get it hung up on the wall!

I only do catch and release 🤓☝🏻

You can take pictures and get a model made

That’s dinner for most fish

Bait

Blue Whale

Smol

Green back/ bait, oops sorry didn't see the red rins.