Not tryin to steal ur thunder necro but my boy slammed so much shrimp 2nite i had to share, thought ud appreciate it lol...u should really try some Vita-Chem on ur food they seem to go crazy for it.
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The females have a stronger/thicker upper jaw. The females vent is oval and ends in a round, fleshy lobe. The males vent is pointier and does not have the fleshy lobe at the end.
Necro's looks male from the head and body shape. I(We)'d need to se a vent picture though.
Breeding require a large pond.
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Ye got two dark grey ones in with my big koi pond is about 20ft by 8ft by about 4ft biggest wels is about 3ft and the second is just under 2 feeding on halibat pellets, boillies, muscles, the odd frog that makes its way into the pond and a few live fish once ina while. Also going fishing for them in the Ebro in Spain this year.