Sexing the Silver Arowana

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hello guys, i have been feeding silver arowana for 5 years. Around 80 cm in length. what is the gender of this fish in your opinion? thanks.

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The only reliable difference we observed with our dozen or so adult silver arowana, who have been involved in courtship and breeding, is that the male's pelvic fin extensions do not reach past the anus while females' do. This difference has been consistent between the genders and significant.
 
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