I currently have two, S.A (SOUTH AMERICAN) REDTAIL CATFISH and Two TIGER SHOVELNOSE CATFISH(TSN) I Use to Own at least 10 of each catfish speices already.
One of them each is a male and a female for these two specise. In the wild fishes that are mouth broader have big mouths for their babies. Due to their Aggression like the catfishes like the RTC, Northen american Shovel head catfish with their wide large mouths. also other species like the Male Arrowana, they are the most over protective type of fishes to their spawn. I have seen a male large black male bullhead catfish in the wild that look like it was carrying a 100 spawn in it's mouth during a spring time.
So at least in good theroy of my obsevations. I STORNGLy Belive that the male of the RTC and the TNS are the one with the large head and mouth.


i consider this is a male RTC.(above)

last picture the one one the right i consider it a male Tsn.
One of them each is a male and a female for these two specise. In the wild fishes that are mouth broader have big mouths for their babies. Due to their Aggression like the catfishes like the RTC, Northen american Shovel head catfish with their wide large mouths. also other species like the Male Arrowana, they are the most over protective type of fishes to their spawn. I have seen a male large black male bullhead catfish in the wild that look like it was carrying a 100 spawn in it's mouth during a spring time.
So at least in good theroy of my obsevations. I STORNGLy Belive that the male of the RTC and the TNS are the one with the large head and mouth.


i consider this is a male RTC.(above)

last picture the one one the right i consider it a male Tsn.