How Fish Adapted to Carry Eggs in Their Mouths

Mouthbrooding fish hold their eggs and young in their mouth for an extended period of time. This unique form of parental care in fish has evolved independently in at least nine families, including cardinalfish, cichlids, and jawfish... but how did this behaviour evolve?
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All images and videos used herein are 1) used with a license, or 2) used under the parameters of Fair Use law.
References:
Goodwin NB, et al. Evolutionary transitions in parental care in cichlid fish. Proc Biol Sci. 1998;265(1412):2265.
Weller H, et al. Relaxed Feeding Constraints Facilitate the Evolutionof Mouthbrooding in Neotropical Cichlids. Am Nat. 2022; doi: 10.1086/719235.
Balshine-Earn S and Earn DJD. On the evolutionary pathway of parental care in mouth-brooding cichlid fishes. Proc Biol Sci 1998;265:2217.
Rüber L, et al. Evolution of mouthbrooding and life-history correlates in the fighting fish genus Betta. Evolution 2004;58:799-813.
Hoey AS, et al. To feed or to breed: morphological constraints of mouthbrooding in coral reef cardinalfishes. Proc Biol Sci 2012;279:2426-2432.
Ostlund-Nilsson S and Nilsson GE. Breathing with a mouth full of eggs: respiratory consequences of mouthbrooding in cardinalfish. Proc Biol Sci 2004;271:1015-1022.
Okuda N & Takeyama T. Age-specific filial cannibalism in a paternal mouthbrooding fish. Behav Ecol Sociobiol 1997;41:363-369.
Cunha-Saraiva F, et al. From cannibal to caregiver: tracking the transition in a cichlid fish. Anim Behav 2018;139:9-17.
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Credit:
liquidguru. vimeo.com/42486100
#naturedocumentary #animals #animaldocumentary

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Stumbled upon this channel, watched a dozen or so videos, and then got a bit sad seeing you arent posting. Regardless, I hope all is well!!

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[@frankenscience3802]

Hey guys! Some of you might notice that I had already made a video on this topic. I wanted to re-do one of my oldest videos, because I think I’ve improved a lot at content-creating since I first uploaded it over a year ago! Hope you enjoy watching. My next video will be on a completely new topic 😃

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[@DissYraiN]

I love watching my Cichlids protect their young. after the eggs hatch they rear the young in their mouths and theyre super aggressive, attacking fish or turtles 50x their size. they often die after the young are self sufficient because they aren't eating the whole time.

[@Constantine_Cvl8]

That applies to Emperor Cichlids, but if your mouthbrooding cichlids are dying after releasing fry then you're probably not caring for them properly.

[@DissYraiN]

@Constantine_Cvl8 it could be inbreeding as well. Or just the stress of the turtles and oscar. They definitely have abundant food because the other inhabitants are messy eaters. I'm on like the 10th generation from the original 5 now and they haven't been able to breed successfully for a while. I'm down to 3 or 4 and they still exhibit breeding behavior. At this point I'm waiting for them to die off because I don't want to catch them.

[@arjunobulam2653]

it's been 11 months what happened

[@emom358]

Where did you go? These are interesting videos, I'd watch more of them.

[@cyntiaprado203]

Wonderful

[@WhoElseButZane]

I feel like my jaw would just get tired

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you need to start posting again

[@forgotten1s]

Ive often wondered this

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Why haven’t you posted?

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Wonder why he isn’t posting anymore. Could have been hacked? Idk

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I hope you post more.

[@frankenscience3802]

New video coming out this week!

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@@frankenscience3802 That was a lie

[@robertforrester578]

What happens when they have to sneeze?

[@shaguftafahmid9632]

It is just story of love of parents of mouth brooding fish. A lesson of extreme strange strategy to keep safe and avoid extinction of upcoming species from nature .

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Wow!

[@rayray2131]

I stumbled across this channel last night It’s very sad that this channel is probably already dead now…

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[@majorbruster5916]

I enjoyed watching this video, but the ending was rather abrupt. I felt that it was cut from a much longer documentary. This left me feeling somewhat cheated out of a proper ending. Pity. It could have gone on to discuss mouthbrooding in South American cichlids and in chocolate gouramis, and how their ecological circumstances led them down the same path.

[@frankenscience3802]

Thanks for the feedback! I’ll need to work on my endings 🙂

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Fish name

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[@dracodracarys2339]

4:47 "Triggered into aggression by the slightest of threats." so twitter users, basically

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You misunderstand the dynamic nature of biological complexity....!

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