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There is no way to sex the Black Ghost Knife Fish (Apteronotus albifrons) by just looking. There is one person who is reported to have bred this fish in Australia and he is the only person known to have bred this fish in captivity. If you manage to spawn a pair, the one that lays the eggs will be the female. This fish grows large, around 50cm. So I hope you have a tank to suit.

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17y ago

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