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Sexing Laetacara Thayeri

Stijn1191

New Member
Messages
27
There is very little information on the internet for sexing Laetacara Thayeri. I've bought a male and a female. But I would like to double check here with the experts ;) the first one in the video is which I think is the female and the second one the male. He is a bit bigger.

 
Last edited:

MacZ

Well-Known Member
Messages
2,984
Location
Germany
Pass. Haven't even seen that species in the flesh yet. Only L. dorsigera and L. curviceps in the trade here. I could only go by literature, web and that bit of experience with the other species of that genus.
 

anewbie

Well-Known Member
Messages
1,374
I have 6 of them and i'm 90% sure one is a definite female and at least 3 are males but i can't really provide an explanation other than the markings and size are different. One of the issue is they don't exactly sit still next to each other when i want to examine them. There is a distinct difference in the pattern on the side. I don't know if this is sexual or something else - but the larger ones tend to have a solid black line and the smaller ones has a break in the line with a bit of a copper colouring - semi circle. Might just be sample variation or might distinguish male from female - not sure.
 

anewbie

Well-Known Member
Messages
1,374
One thing i will note as they have gotten older tensions have risen and they are taking full advantage of the 10ftx4ft they have available. The two i think are female are still chippery go anywhere and no pairs have formed but the other 4 are showing a distinct dislike for each other.
 

Stijn1191

New Member
Messages
27
Here are some photos, they are hard to photograph. The male has a brighter yellow on his top fin + it's longer than the other fish. Furthermore the male has a red/purple-ish glow close to his dorsal fin towards it's belly. On the photo's you can see nicely the fluorescent blue/green around their gills :)

On the photo's the female is looking more stressed (dark) than she normally does, because I've been feeding them to get them to the front of the glass and the male was chasing her away from the food.

Male i presume:
WhatsApp Image 2024-02-26 at 19.12.49.jpeg


WhatsApp Image 2024-02-26 at 19.14.02.jpeg


Female I presume:
WhatsApp Image 2024-02-26 at 19.14.02 (1).jpeg

WhatsApp Image 2024-02-26 at 19.14.03.jpeg
 

Apistoguy52

Active Member
Messages
284
If the explanation in CA 1 is reasonably correct…”the soft-rayed section of the dorsal fin is enlarged and pointed in males, but usually rounded or only minimally pointed in females”…I’d wager both fish are male.
 

Stijn1191

New Member
Messages
27
Hmm I also saw that, but for example, look at this video. Both have pointed dosal fins but they lay eggs.
 

Mike Wise

Moderator
Staff member
5 Year Member
Messages
11,212
Location
Denver, Colorado, U.S.A.
I can't say anything from your photos but the photo from the start of the YouTube video shows the obvious sexual differences. Male at the front is more elongate and the dorsal fin extends farther back (to the back of the caudal). The female is more stocky and the dorsal fin does not extend as far back in comparison to the caudal fin.
 

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