What is the problem with this plakat

[Aniket]

I used him for breeding before 2 weeks ago. After breeding i found big red strip between pectoral fins and dorsal fin. And he was fine upto 2 days ago but now he was not eating and laying on one side and color at mouth and stomach was fading. I was feeding him betta flakes, blood worms and mosquito larvae.and yesterday he died. And im unable to find any reason behind it.

 

[Aniket]

He is before 6 months ago

 

[Colin_T]

Does his mouth look more white and puffed up in the most recent pictures compared to when you first got him?
It does to me and the combination of a white puffy mouth and pale red patch on side and not eating for 2 days would suggest a bacterial infection and possibly Columnaris. However, it could also be stress related due to breeding. When fish breed they use up a lot of reserves and breeding might have weakened him physically and allowed any type of bacteria to infect his body and kill him.

Stress from breeding is a bigger issue in labyrinth fishes (Bettas & Gouramis) and fish like cichlids that show parental brood care (look after their eggs and young). With labyrinth fishes, the males don't always eat when looking after the eggs and young and can sometimes go for several weeks without food. Under normal conditions this wouldn't be a big issue but the males sometimes get injured when displaying to the female and during breeding, and small bites and cuts can quickly become infected and make the fish sick when they don't eat for several weeks.

A similar thing happens to mouth brooding cichlids when they have a mouth full of eggs or fry and the adult fish don't eat for 3-4 weeks. If they get damaged during breeding, they become more susceptible to diseases due to lack of food, which normally helps keep their immune system strong.

Food could be an issue and depending on where you get the mozzie larvae from might have been a contributing factor. If the live food is from a clean pond or waterway that does not contain fish or birds, then it is usually fine. But if there are fish or birds in the pond then they can encourage diseases, which get transferred to the tank and your aquarium fish get sick.

Water changes might be a factor too. Perhaps try doing more or bigger water changes and wipe the inside of the tank/ container out each time you do a water change. the less biofilm (slime) on the inside of the glass, the less bacteria and other microscopic organisms in the container.

 

[Aniket]

Does his mouth look more white and puffed up in the most recent pictures compared to when you first got him?
It does to me and the combination of a white puffy mouth and pale red patch on side and not eating for 2 days would suggest a bacterial infection and possibly Columnaris. However, it could also be stress related due to breeding. When fish breed they use up a lot of reserves and breeding might have weakened him physically and allowed any type of bacteria to infect his body and kill him.

Stress from breeding is a bigger issue in labyrinth fishes (Bettas & Gouramis) and fish like cichlids that show parental brood care (look after their eggs and young). With labyrinth fishes, the males don't always eat when looking after the eggs and young and can sometimes go for several weeks without food. Under normal conditions this wouldn't be a big issue but the males sometimes get injured when displaying to the female and during breeding, and small bites and cuts can quickly become infected and make the fish sick when they don't eat for several weeks.

A similar thing happens to mouth brooding cichlids when they have a mouth full of eggs or fry and the adult fish don't eat for 3-4 weeks. If they get damaged during breeding, they become more susceptible to diseases due to lack of food, which normally helps keep their immune system strong.

Food could be an issue and depending on where you get the mozzie larvae from might have been a contributing factor. If the live food is from a clean pond or waterway that does not contain fish or birds, then it is usually fine. But if there are fish or birds in the pond then they can encourage diseases, which get transferred to the tank and your aquarium fish get sick.

Water changes might be a factor too. Perhaps try doing more or bigger water changes and wipe the inside of the tank/ container out each time you do a water change. the less biofilm (slime) on the inside of the glass, the less bacteria and other microscopic organisms in the container.

Yes his mouth little bit puffed.