Red devil nuchal hump

[achilles]

Hiya,
I'm curious about what causes the nuchal hump of red devils (or other cichlids with a nuchal hump) to increase and decrease in size. We've recently had a sudden introduction to summer and the tank went up a close to a degree (celcius) while I was at work. The fan has been on since to cool down, but I noticed that the devils hump increased in size noticeably as well as him becoming more aggressive.

Basically I'm curious whether there's a relationship between nuchal hump size and mood and whether it's temperature related at all. Thoughts?

 

[boxhitter]

dude its all genenitic of the fish you cant do anything to get your fish to grow a hump either it will have one or not sorry to burst you bubble. i have a 7 inch red devil and he doesnt have a hump but it looks like be might be growing one. either way this is my fav. cichlid

 

[kayla]

I am pretty sure it does have to do with dominance, but maybe someone else who knows for sure can chime in.

 

[ashdavid]

Humps can change considerably in size due to a few factors, 1# strees levels can play a part in the hump size. 2# enviroment 3# When the same or similar speices are housed together or in a tank side by side in plain veiw of each fish's line of sight, as kayla said "dominace" will make a hump change in size. The final size of hump when the fish is at its best will have to do with genetics, but as stated before can change with enviroment.