Ranking Fish Parents from Best to Worst!

Added: 2026-06-03

[00:00:00]All right. Your last guppy gave birth and immediately tried to eat the babies.

[00:00:04]You watched it happen and you genuinely didn't know that you were supposed to do something. Meanwhile, somewhere in Lake Tanganyika, a fish the size of a jelly beans running in a coordinated home defense system for kids that it shares with three other adults. Today, we're ranking 15 species by parenting. And a few of you guys, well, you're going to need to sit with the results for just a minute. But before we dive in, yes, I am a real person. I'm Taylor. I'm the narrator for Aquarium Store Depot and I have been for years. And and I want to say this. I know that the internet right now is chalk full of AI sloppiness. It's everywhere. But I assure you, everything made right here at Aquarium Store Depot is made by living, breathing, actual fish nerds. Now, if you'll excuse me, I've got a clown fish persona to morph into. This one right here is the one that broke the rules. The male seahorse gets pregnant. Not metaphorically, not as like a shorthand. Literally pregnant.

[00:01:03]Zing the day family rewrote vertebrate reproduction like entirely. The female deposits eggs into his brood pouch. He fertilizes them internally and then he gestates the embryos through a vascularized structure that functions remarkably similarly to a mamillian placenta. Complete with hormone cycling and everything. He has contractions. He gives birth. He is the only vertebrate on this planet where the male carries the full pregnancy. Full stop. The female, meanwhile, drops off the eggs and swims away with effectively zero further parental investment. And occasionally, she might just swing by to say hi. That is roughly her involvement.

[00:01:40]Meanwhile, human dads are sitting in group chats arguing about whose turn it is to take out the trash. The seahorse has settled the equal parenting debate by simply taking the entire job and never giving it back. There is no other vertebrate on Earth that does this. And the more you read about actual biology, the more genuinely absurd it becomes. S tier parenting. The only fish that broke biology to win this list. Go dads. The smallest cichlid at your local fish store is patrolling a snail shell with the territorial energy of somebody who's parking in the wrong spot and they have been for like 15 years and they're just kind of done being reasonable about it.

[00:02:14]That that's that's a multis. They top out at around an inch and a half. They are aggressive on a scale their body cannot physically justify. Okay, their whole colony call they just cooperate on defense, which is kind of like the part most keepers miss until they actually see it happen. The female lays inside the shell. The male fertilizes. The entire group starts charging anything that drifts remotely into their column.

[00:02:37]They'll charge a fish 30 times their size. They'll charge the glass. They'll charge your hand during a water change.

[00:02:43]and you will flinch every single time because yes, the something something the size of a peanut is genuinely committed to ending you. The HOA is open for business and the shell is private property. B tier and honestly the smallest committee in the lake is holding the biggest stick. Uh that's stick people, okay, with an S and a T.

[00:03:02]Listen, this fish right here is smaller than your thumb. And the female aisma, well, she lays in a cave. She fans eggs constantly to keep oxygen moving and then she physically picks out the infertile ones before fungus has a chance to spread to the healthy clutch.

[00:03:17]After hatching, she herds that fry in a tight little formation that looks suspiciously kind of like a soccer game being yelled at by a coach. And then a 1.5 in fish picks a fight with everything that swims past her little cave, including animals that could swallow her like whole. Anyone who's dropped a pair of Aistos into a peaceful community tank has watched this happen in real time. The tank was peaceful at 9:00 a.m., but by noon, boy, she had eggs. And by 3 p.m., every other fish was hiding behind the heater, wondering what they did wrong. She's got the energy of someone who's been awake for like 3 days straight and hasn't eaten anything substantial, and they're completely out of patience. A tier, man.

[00:03:56]The smallest cichlid in the tank running the largest operation. Full marks for effort here, but zero marks for execution. And angelf fish do every single thing right at the beginning.

[00:04:06]They pick a vertical surface, usually a leaf or a piece of slate. They clean it obsessively for hours, and they lay the eggs in a neat little row that you see every breeding forum show. Both parents fan and guard the clutch with focus that genuinely looks like they read the manual. Then something stresses them out. A light flicker, a tankmate looking at them sideways, the filter making a sound, and they eat the entire clutch in about 15 minutes flat. Uh, some pairs do this for months. A few pairs do this for years before they ever raise a single fry to free swimming. Experienced breeders are going to pull the eggs and raise them artificially in a separate tank because, well, the parents cannot be trusted to not panic eat their own children at the uh, slightest provocation. These are the fish who studied for the test, sat down at the desk, and then ate the paper. The intention's real. At least the the follow-through is the real problem here.

[00:05:00]Ctier on the strength of effort alone.

[00:05:02]Eating your kids doesn't get you many points. She has not eaten in a month.

[00:05:07]She's carrying somewhere between 30 and 50 kids in her face. Yes, she looks tired, gaunt, and visibly underweight because she is. Buddha mothers from Lake Malawi practice maternal mouth brooding, which means the entire clutch goes into her mouth at spawning and stays there for 3 to four weeks while she fasts.

[00:05:27]After the fry hatch, she releases them to feed. But the moment something stressful happens in the tank, every single fry comes screaming back into her mouth like a fire drill at a daycare.

[00:05:37]Except hopefully, Listen, I'll say this once. Please report your daycare if your kids are are being held in anyone's mouth. Okay. The mouth is a panic room.

[00:05:46]The mouth is also her mouth. She had not had a meal since January, and the kids treat her like an emergency exit they can sprint into at will. The male, meanwhile, has a harum and contributes exactly zero follow-up after fertilization. Most keepers don't even catch the spawn. They just notice one day that her cheeks look weird, and that's how they find out. Mouth bruers achieve 67% fry survival rates compared to under 5% for broadcast spawners like guppies. So, yeah, B tier, the most overworked single mother in the Rift Lake. Now, Oscars. Oscars love their eggs so much they eat them. Bonded pairs commit to each other with real sincerity. That's not the problem. They pick a flat rock. They clean it for hours. They fan the eggs together while staring at the clutch with what genuinely looks like pride. Then a door slams somewhere in the house and uh the lights turn on and off for half a second and somebody walks past the tank too fast and then boom, the clutch is gone.

[00:06:37]Some pears have eaten every spawn that they've ever produced for like 3 years running. This isn't lazy parenting. This is anxiety eating. the fish equivalent of someone who is doing pretty great until something slightly stressful happened and now the clutch is gone and nobody's talking about it. Experienced Oscar breeders pull eggs the moment they spot them. Why? Well, because the parents have proven that over and over and over. They will betray themselves the second the room gets loud. The pair bond is genuinely real, but the execution speedruns disaster every single time. Dtier and And they would tell you that they're trying. Uh, the Julie cichlid is in a more committed relationship than most people that you know. These East African rift lake fish form genuinely lifelong monogamous pairs, which is pretty wild on its own, but the relationship is also stress sensitive in a very specific way. A large water change can trigger a full domestic dispute. A heater swap can do it. The pair bond is so tied to environmental stability that messing with the tank too aggressively can cause the two fish who have been together for years to suddenly turn on each other in the rock work. Both parents guard the eggs and fry together, splitting territory duties around the cave system.

[00:07:52]And the whole arrangement reads less like animal behavior and more like a couple who's been together since college. Meanwhile, half the fish on this freaking list cannot even agree on who is supposed to eat the eggs versus guard them. B tier most committed relationship in the lake. You might not have known it, but a fish that breastfeeds exists. It is sitting in a high-end planted aquarium somewhere being maintained by a hobbyist who has not slept properly in months. Viscus parents from the Amazon basin secrete a specialized skin mucus that the fry physically swim up to and graze off of.

[00:08:23]And both mom and dad produce it for the first 3 weeks of life. The secretion contains immune compounds, energy nutrients, and over a dozen specific proteins that only appear during the brooding period. Analogists to mamleon lactation. This is the closest comparison anyone has come up with is mamlon milk, which gives you kind of a sense of how unusual this is for freshwater fish. Both parents share the workload, which is rare. The fry literally peck at all their flanks all day long. No, no other freshwater fish does this, and most hobbyists have never seen it in person because discus are the kind of fish you usually fail with several times before you ever get to watch a successful spawn. S tier, man, the closest thing Freshwater has to a mammal. Finding Nemo got it completely backwards. Yep, I'm sorry. When Nemo's mom died, his dad would have changed sex, become female, and then taken Nemo as a new mate once he matured. It sounds weird, but it's nature. The whole movie is biologically wrong from the second scene onward. In real clown fish biology, the male is a genuinely devoted egg garter. He fans them. He picks debris off them. He watches the clutch with focus that puts most reef fish to shame. The catch is what happens when the female dies. The dominant male permanently switches sex, becomes the new female, and the next available subordinate male slides into the mating role to raise the next clutch. New gonads. Who this? Okay, sorry. Uh, new gonads. New hormones, new family unit.

[00:09:51]The previous family structure, well, it dissolves the moment that mom was gone.

[00:09:55]Dad is mom now and new dad is is some guy that used to live two anemy anemone tentacles tentacles away. Yeah. Anyways, the egg guarding is real. The family unit is on a hot swap timer. C tier. And somewhere a Pixar writer owes me an apology. He spent three days on a bubble nest. He picked this spot, blew the bubbles, reinforced the structure with floating plant material, and presented the whole thing like a man showing off the house he just bought or built rather. The courtship display was quite elaborate. You should have seen it with full fin flaring and the embrace itself happening in slow choreographed wraps.

[00:10:31]The fertilization, oh, you best believe it was attentive with him collecting eggs in his mouth one at a time and placing them gently into the nest. Then the moment the female was no longer biologically useful, well, he tried to kill her. Anyone who's bred Bettas has scrambled for the divider, at exactly that moment, watching dad transition from suitor to threat in a single bin flick. He guards the nest alone for several days with very real dedication, repositioning eggs as they fall and snapping at anything nearby. Then the fry become free swimming and he just turns around and eats them. Every single phase of this fish's parenting cycle ends with someone needing to be removed from the tank for their own safety. D tier most dramatic short-term commitment in the hobby. Okay, live birth happens.

[00:11:15]Fry hit the water column. The mother turns around. She does not pause to count them. She does not check on them.

[00:11:20]She does not have a maternal epiphany.

[00:11:23]She tries to eat as many of her own children as physically possible within that next 30 seconds. And only the fry that survive, well, those are the ones that they're the only ones that immediately torpedo into the densest plant clump in the tank. And they refuse to come out for the rest of the day.

[00:11:37]Every beginner who's ever owned guppies has watched this happen. They go to their phone and they Google some variation of why is my fish eating her babies. The frier born already understanding their mother. Oh, she's the threat. That's a generational trauma encoded directly into the species, baby.

[00:11:52]The female just gestated these kids for roughly 30 days. She gave actual live birth and the second they hit the water girl she sees lunch. Somehow this species is one of the most overpop populated fish in the entire hobby mind you which tells you exactly how many fry actually escape this routine. From the poid day family guppies produce 20 to 50 fry per spawn but achieve under 5% survival without human intervention.

[00:12:16]We're going to put these guys in Dtier and we hand these to children. Yes. Now the genus beta has a has a little secret. Okay. Let me tell you tell you what it is. Beta Splendons, the one beta you see everywhere that we discussed has wild relatives who are model fathers.

[00:12:31]That's right. Mouth brooding species exist like beta alba margina. Genoides and simplex have the male hold every single egg in his mouth from spawning to hatch and he does not eat for the entire duration. Go dad. In several of these species, the female actually leads the courtship and defends the territory while dad just kind of sits there quietly doing the most important job in the whole gosh dang genus. The contrast here is genuinely unreal. The fish, you know, from pet store cups is like the embarrassing branch of the family tree.

[00:13:01]You know, the wild relatives are out here practicing devoted paternal mouth brooding while their cousins biting the female's tail off. It's like that one cousin's house you go to where there's like 30 people living in in one two-bedroom house. You know what I'm talking about? Anyways, uh most hobbyists have no idea these species even exist, which is a real shame because they completely reframe what betettas are biologically capable of.

[00:13:23]The genus contains both the beta splendins disaster and these guys. And somehow the Splendins is is the one with the cultural reputation. Okay, so these guys, we're putting you up in a tier, the branch of the family the Splendins never invites to dinner. This fish does not parent. This fish is running a parenting scam through brood paroticism.

[00:13:43]Parid look they're parasites. Okay.

[00:13:45]Cuckoo catfish time their own spawning to coincide exactly with a mouth brooding cichlid. Usually a lake tanganika species. And you know what they do? These little buggers slip their eggs into the mix during the host's spawn. The cichlid mother completely unaware scoops up her own eggs and the catfish eggs together and then starts brooding the entire mixed batch in her mouth. Those little catfish eggs are going to hatch faster which evolution specifically optimized for. and the baby catfish immediately eat every single cichlid egg before the host's biological offspring can hatch. The cichlid then raises the catfish fry as her own with the same fasting, the same protective behavior, the same mouth as shelter system, and she never once knows that she's lost her entire clutch. The cuckoo bird does this in trees. This catfish does it in substrate. And somehow it's more elaborate. The catfish mom did not raise her own kids. She filed them under someone else's problem and left Dtier and that's being generous. She has not eaten in 7 weeks. From Tulsa female holds fertilized eggs in her mouth for somewhere between 35 and 50 days without ever releasing them, which is one of the longest mouthrooting periods in the entire cichlid family. After the fry hatch, she practices buckle feeding, which means she takes food into her mouth, partially processes it, and feeds it to the fry inside her mouth before they're even released into the water column. She's making lunch for the kids she's not even put down in over a month while not eating herself while still keeping them physically inside her own face. Most cichlic keepers have never personally witnessed this and the visual is genuinely hard to process the first time you understand the mechanics. The male meanwhile maintains a harum of three to four females and contributes well no parental effort past that initial fertilization event. You know he's busy elsewhere. She's doing every single piece of it alone. A tier for her. The most operationally hardcore mom in fresh water. Happy Mother's Day. Ah, the fish that jumps out of water to catch bats has one weakness. He cannot say no to his kids. The male silver arowana from the Amazon basin takes every fertilized egg into his mouth and holds them for several weeks, all while not eating, and continues to brood the fry until they're large enough to survive independently. This is a three-ft long ambush predator that hunts birds in the wild. The moment that eggs exist, Bro becomes a stay-at-home dad with a strict no food policy. See, the lineage of this fish, well, it goes back roughly about 150 million years. That's going to predate most of the dinosaurs anyone actually cares about. And the male still does his part every single time. The female drops the eggs and is functionally finished. He he he carries the rest of it, literally in in his in his face, while still being the apex predator in his stretch of river. There is something genuinely moving about a fish that can catch a flying animal midair. Also just refusing to eat a snack while his kids are in his mouth.

[00:16:37]Like all the dads who make time for their kids and work a full-time job and go to the gym and all the all the things. You go dads. You go. A tier man and the most dramatic character arc on this list. But listen, if you started this video assuming the apex predators would be dead beats and the tiny fish would be useless, well, you owe yourself a mental rewrite. The hobby's smallest cichlid runs a coordinated defense colony. The fish that hunts bats holds his eggs in his mouth for weeks. The seahorse, well, it just went and rewrote vertebrate pregnancy entirely.

[00:17:07]Meanwhile, your guppy ate her own kids before they finished drying off. And somehow she's the one we had to hand to beginners as a starter fish. The fish we treat as easy are usually the worst parents. And the fish we treat as advanced have parenting routines that would humble most mammals. The hobby is the rankings backwards and the pet store has been quietly selling it that way for decades. But you know what? I want to hear from you. Which fish on this list have you actually bred? And did those parents live up to their tier I gave them? Or did your pair completely betray me on camera? Drop the species and the stories in the comments, especially if you've got an Oscar pair that broke the streak and actually raised a clutch. If you want more deep dives into the weirdest behavior in Freshwater, well, the subscribe button is right there waiting and the next video is already queued up. Till next time.