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...I've never heard of this before actually, nor have I experienced this with any of my fry so far. Granted, they're not too pleased at being in a small container all of a sudden, but 'depressed' isn't at all how I'd describe it. Bettas are indeed a lot more intelligent them most give them credit for, as I'm sure we all know, but we need to remember that these are still simple creatures who don't feel the same level of emotions as we humans do. Its more likely their 'depression' is coming from a sudden loss of room to really swim and explore(though thats never stopped my guys....), cooler temps, or a combo of both as opposed to being separated from their brothers and sisters and 'missing' them....I'm sure theres the odd betta here and there that is social and likes the interaction, but for the most part, bettas are solitary and prefer being alone....
Heres something my dad noticed with my spawn at about week 3 or four....there wasn't any aggression, but they all kept to their own 'space' and didn't really 'interact'. Thats still true now with the ones still in the main tank......they nip and chase a bit, but its not true interaction like you'd see with a school of fish who need and enjoy company of its own species, they tolerate one another, not really enjoy each others presence. Like I said, I'm sure theres the odd betta here and there that actually enjoys company of some sort, but I don't think its all that common....
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