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That means its healthy, not that its pregnant. Oto's lay eggs which means they don't get fat when they breed. However a plump oto indicates a healthy eating oto.
I've had my otos spawn only once and none of the eggs survived. It was fun watching them spawn though. I understand you'll have more success if there are several males for each female.
Yeah i have about 10 otos in there tho cant tell female from male
some of them are FAT and healthy there all really really active love to stick together
here is a pic of a few of them the bottom one is a real fatty lol
When mine bred it was a few days after I brought them home from the LFS and added them to my 30 gallon planted tank. It may have been the change in water parameters that caused their behavior. Whether that was a temperature change or something else I can't say.