#fish biology

[gobworm]

salmon life cycle charms!

buy them here!

[problemswithbooks]

Shark Genitals & World Building

So, I've seen this Q&A a few times now and it really got me thinking about Fish-man biology.

Now, to be clear, I think it's pretty clear Oda isn't being entirely serious. When you look at how he designs his characters he goes for whatever is fun. He's not doing extensive research on whatever aquatic species he slaps on his fish-men or Merfolk characters. This is why for a lot of them, if you look up what they are mixed with they rarely share much if anything with the animal he's picked.

Saying a character has two dicks is funny, so Hody has two dicks--that's all.

But taking the answer more seriously the idea that at least some (because they do vary so widely from fish-person to fish-person) have changed genitals because of their added fish anatomy is interesting from a world-building perspective.

As someone who has a special interest in animal biology and has watched a lot of documentaries I can say that fish have really diverse breeding strategies. So, I guess, if Hody can have two dicks because he's a shark, I wonder if this could be true for any other fish-people and merfolk.

We see that at least some fish-people do have children the same way regular humans do, but to my knowledge we don't see any pregnant mermaids. Given how much larger Neptune is then his wife, and how massive Shirahoshi is, I think it makes sense that perhaps like many fish, Otohime laid eggs that were fertilized separately (this is actually how goldfish mate).

It could be possible that the way mermaids or even fish-women have children depends on the father. If they are not compatible in size they can reproduce Ovuliparity (the way I imagine Otohime did), or if they are of similar size they either go the more human route or, after copulation they lay fertilized eggs (like the skate cases often called mermaid purses you find washed up on the beach).

There's also something to be said for the variations fish have with gender. Some fish are capable of changing gender. It's more common that female fish become male (protandry), usually the largest of a group replacing the dominate male in the group. This happens mostly with coral reef fish like wrasses, groupers and parrot-fish.

Meanwhile, anemone fish, like clown fish change from male to female. When the one female dies the remaining male will become female, while an outside male will become that new female's mate.

Then there are Black Helmet fish which are both simultaneously and take turns releasing eggs and sperm when they spawn.

So, if fish-people and merfolk had similarly diverse genders and ways of reproducing I think that'd just be really neat. It could also lead to some fun misunderstandings between fish-people, merfolk and humans.

Of course, I don't think Oda ever put that much thought into it. He just does whatever he finds fun character design wise. I mean, it's not like Arlong has barrels like Sawsharks do, and Jinbe looks nothing like a whale shark. On top of that the story isn't really focused on that type of world building. Nor do I think he could really showcase something that deals so much with sex--even if it is fish sex.

Still, makes for some really great head-canons.

[cinnamonchampion]

I'm a violent defender of these types of fisherman memes. There just do funny 💔

[volley-ball-101]

'Beta fish' implies the existence of An Alpha, omega, or even Sigma Fish

[toadbreath]

👀

[fish-enthusiast622]

[whalefill]

the mighty gar...

(my half of an art trade with @jackalspine!)

[t00thpasteface]

here's something stupid: the catcatfish

some quick facts:

they're nocturnal and tend to roam around while awake.

they have keen senses of smell and hearing, but terrible eyesight. despite this, they also have a tapetum lucidum, making their pupils "glow" in the dark.

their fur is short, dense, and oily to waterproof them.

they prefer a diet of mostly meat and are attracted to strong-smelling food like fish, cheese, and anything fermented.

the elongated dewclaw on each front paw is sharp, flexible, and nonretractable. it injects a venom that causes respiratory failure and cardiac arrest in prey and, in extreme doses, humans. veterenarians typically remove the dewclaw venom glands during the neuter/spay procedure.

they grow to an average of 1m and 23kg (3ft and 50lb) but can reach up to double that length and triple the weight!

[armadillorollup]

know the difference!

[the-briny-bulletin]

[jellyfishmakeoutparty]

I love butterfly rays because half of the images of them online come in two varieties and it’s

a) a baybey!

b) I know what you are.

[typhlonectes]

[feelingautistic]

Exciting news for the cute shark lovers of the world! We finally have a recorded sighting of a baby great white shark, likely only a few hours old.

The question of where great white sharks give birth still remains a mystery to this day but this footage may suggest the coasts of California, where the footage was taken, are a site where these sharks give birth.

[marinememes]

I've been collecting these for a few weeks and I NEED MORE

[fishyfishyfishtimes]

While researching for upcoming fish facts I ended up going down a rabbit hole on parrotfish teeth, and I need to share this information in another form than just a fish fact. This stuff is unbelievable. You know the beak of the parrotfish, right? It's formed from the fused teeth of the parrotfish, as an adaptation to have ample biting surface to scrape off and chew on coral, their main food source.

A close-up of the beak of a parrotfish. It has this honeycomb pattern which I find very cool.

Well. To constantly chew on coral, they must have some pretty hard teeth, right? And they indeed do: the teeth of the parrotfish are made up of a mineral called fluorapatite, which forms intricate, chainmail-like woven structures on a microscopic level. Fluorapatite just so happens to be the second hardest biomineral found. This stuff, the parrotfish's teeth? A square inch of the parrotfish's teeth can withstand a whopping 530 TONS OF PRESSURE!!! That's the weight of 88 ELEPHANTS on top of a single square inch!!!! That's crazy, right!!?? The only biomineral that is tougher is the teeth of chitons, that is the single tougher biological thing in the whole world!!! Not only that, but the stiffness and hardness of the teeth increases the more we get closer to the tip (as the mineral fibers get closer and closer to one another), the very tips of the teeth even surpass the chiton teeth in stiffness!!!

Here are pictures produced through a process called PIC mapping, which shows the size and orientation of crystal fibers at the tip of the teeth.

That feels like it shouldn't be right, no? You'd think that the toughest biominerals in the world would belong to, like, the skull of an animal that rams into rocks or maybe the shell of some animal, not the teeth! The teeth of chitons and parrotfish out of all animals no less! Who would've guessed that the diet of "rock animal" would make the parrotfish require some of the toughest dentition the world has ever seen, huh? That right there is one super good reason why you should never stick your finger in the mouth of one.

Every day I am blown away by how amazing fishes are....

[marinebioblr]

Close encounters!

My beautiful koi betta Bisby has had a jumping spider neighbor taking advantage of her tank light to hunt bugs under for some time, and recently they met face to face! Very happy to capture each of them acknowledging the other - and Bisby's quick look back at me as if to say "you're seeing this too right?!" 🧡

Edit ✨️ For all those concerned, yes, she does have a lid! I'd just cleaned and was hanging out right there where I filmed from at my office desk. If you are new to fish keeping, please invest in a good lid or when picking setups, favor tank kits that include one!