Well that would explain the whole clutch being Conda's....

Not really. He might have just hit really good odds, it's happened before and it will definitely happen again. If he bred 2 Anacondas together, then he would have had a 1 in 4 chance of producing a Superconda as well as producing a Normal, neither of which were produced. Sometimes you just get lucky!

Are round patterns usually an indicator of Conda's?

Not at all. Anacondas are far too variable to be altogether determined by dorsal pattern alone. That's why we use the terms Low Expression (or Low-Key) and High Expression for describing some of the more extremes in terms of pattern. In High Expression Anacondas, the pattern is so reduced that there's usually very little doubt about it being an Anaconda, some in fact have such reduced patterns, they practically look like Supercondas. In Low Expression Anacondas however, the pattern is less reduced and in some extreme cases, they are practically indeterminable from regular Normals. Over 5 years ago when the first Anacondas were sold, a lot of us originally believed that there were specific markers that defined and determined Anacondas. But, as the Anaconda line started being outcrossed in different collections, a lot of those markers proved false. I wrote an in-depth explanation several years ago here Link. The only Anaconda marker that still seems to be relevant is the "white wall". Even the near to all black belly has proven false as a marker as has been evidenced by many breeders and can be seen on one of my own produced Anacondas:



And just for clarification, here's a comparison of 2 black bellied individuals, the first is a Normal and the second is a Superconda (which is basically the same for Anacondas). You can clearly see the "white wall" separater between dorsal and ventral coloration on the Superconda whereas the Normal's dorsal coloration bleeds into the ventral coloration.

Normal Black Belly


Superconda Black Belly


At this point, the only determining factor whether his female is in fact an Anaconda will only be if she has the "white wall" separation between the ventral scale coloration and the dorsal coloration.

Although the mom snake has some round indicators there is still some square like markings on her.

Again, there is too much variation with Anacondas and even some aberrant Normals. Some will have stripes, some will have spots, some will still have square-ish saddles. Just looking at the dorsal patterns alone will not always be a good determining factor on what the actual genotype of that specific animal is. With Anacondas, you can look for the "white wall", if not found, then chances are it's probably just a Normal.

Maybe the next clutch of eggs will be the same.

That's a possibility. He could also produce a bunch of Normals in the next clutch as well. It will be interesting to see what he produces next with the same pairing.
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