Hi,
I have a group of 6 blue dolphin moorii and there are currently 4 females and 2 males 5 of them being sexually mature from 3-6 inches each 1 female is still young at 2 inches. I decided to buy another adult female dolphin moorii to make it 5 females and 2 males as i would like to breed them. I added the new female in and on the second day she's already adjusted to the tank and she was being quite aggressive towards the 5 bigger ones. She started flaring at all of them and even shaking her body at them and she became very dark and started to kind of dominate the group. She even chased one of the males who is slightly smaller around the tank for a short little bit but so far she has not done any damage yet just some chasing.
The person who sold it to me told me he is pretty sure 100% its a female as he saw it breeding in his tank dropping eggs but no male so eggs all just got eaten. She was the only dolphin in his tank full of peacocks. I know all fish have different personalities but i was pretty surprised to find that this female is really aggressive and dominant and showed typical male behaviour even towards the 2 males. I attached some pictures of her. Any help would be appreciated thanks.





I have a group of 6 blue dolphin moorii and there are currently 4 females and 2 males 5 of them being sexually mature from 3-6 inches each 1 female is still young at 2 inches. I decided to buy another adult female dolphin moorii to make it 5 females and 2 males as i would like to breed them. I added the new female in and on the second day she's already adjusted to the tank and she was being quite aggressive towards the 5 bigger ones. She started flaring at all of them and even shaking her body at them and she became very dark and started to kind of dominate the group. She even chased one of the males who is slightly smaller around the tank for a short little bit but so far she has not done any damage yet just some chasing.
The person who sold it to me told me he is pretty sure 100% its a female as he saw it breeding in his tank dropping eggs but no male so eggs all just got eaten. She was the only dolphin in his tank full of peacocks. I know all fish have different personalities but i was pretty surprised to find that this female is really aggressive and dominant and showed typical male behaviour even towards the 2 males. I attached some pictures of her. Any help would be appreciated thanks.




