Glad to see you on MFK!
... The guy in the video is confident too..he just checks the size of anal fins...
The guy in the video is me. Stating for clarity.
Have u noticed that all your female arowanas have bigger jaws? Just if possible can u confirm sir instead of fin size?
No I have not. There is no correlation between the jaw and sex in adult, breeding arowana that we have kept so far. Per my prior reply:
The jaw thing I need more evidence to take into the account. I didn't see any evidence of this in our arowana with confirmed sexes as a result of breeding and courtship.
You have just correctly pointed out my most recent experience where the jaw doesn't correlate with the sex, same as we have observed before with other arowana. I am glad that you watched our humble videos with great attention to detail. Kudos for you! Yes, indeed, the new young arowana that's not adult, only 1.5 years old, has an overreaching lower jaw but the pelvic fins tell me it's a female. That's all I know for now. If it lives long enough to participate in courtship and breeding behavior, I'll know more then.
Moreover, it seems the overextended jaw doesn't appear to translate into adulthood, I can't be 100% sure, but NONE of our adult arowana had it or have it and we have kept more than a dozen into adulthood.
Lastly, I'd like to state for clarity that my ways are homegrown, not scientific and based on a very small number of fish, which prevents me from making general sweeping statements. It's just my observations and explanation and a resulting personal working hypothesis. You can see that other peers hold different opinions. So there is no consensus. Moreover, science appears to not know external sexual differences of silver arowana, which could be that the scientists looked and not found them (in which case our peers and I can throw away our hypotheses) or that they never looked or never published their results. We just don't know without a scientific literature search and study.