Some synodontis sp.

[Mika]

Hemisynodontis membranaceus? They look different species.

[Silurus]

I believe the upper fish is a young Synodontis resupinatus and the lower fish a young

Synodontis sorex

.

[sidguppy]

the 2 fish behind the Syno in the upper pic are far more interesting!!
Trachydoras paraguayensis, if I'm not mistaken......

[caudalis]

could the top fish be velifer?

[Silurus]

could the top fish be velifer?

Nope. Head shape is wrong.

[Jools]

I think the top one IS

Hemisynodontis membranaceus

, they are spotted like that when small. I grew one up from 1" as I thought it might be something different but sure enough it turned out to be the one of the individuals I had pictued in the clog. A quick shot of the barbles will tell if I'm wrong.

Jools

[Erwin]

I also agree with Jools, that the fish in the top picture is a juvenile of H. membranaceus. The body shape matches perfectly. Poll writes about the juvenile coloration: "Coloration juvénile marquée de taches noirâtres à centre plus foncé plus petites sur la tête et présentes sur les nageoires, surtout la caudale dont les bords externes offrent des taches plus grandes; les dorsale, pectorales et ventrales plus foncées, surtout chez les jeunes." A rough translation: "Youth colouring characterised by dark spots with darker center, smaller on the head and present on the fins, especially the caudal one
whose external edges offer larger spots; in the dorsal, pectoral and ventral more smaller, especially in young specimen."

The second picture shows probably a juvenile of Syn. clarias. Especially if you look at the big fish in the background, you will notice the red caudal, S. clarias is the only species with a red caudal. But also the juvenile coloration match to the specimen in front.

Erwin

[Erwin]

About the fish in the background of the first picture, Sidguppy you are probably right with the genus: Trachydoras, but also T. steindachneri and T. nattereri would be candidates for the species.

Erwin