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@shark--blog
Hello! This blog is all about sharks!
These facts are the ones I've learned and have taken from the internet and have reposted them here!
Also my Header & Dividers comes from saradika-graphics, she has amazing work so you guys should definitely check her page out!
》Masterlist《
Shark Fact: 04
Difference between Male & Female
Male sharks tend to be smaller than females. But the easiest way to tell them apart is to look for claspers. Males have a pair of claspers, which are used for mating. This is like a pair of extra roll-up fins under their body.
(Circled is the male shark those are claspers)
(Male Shark Above)
MALE:
Internally males have two muscular sacs (siphon sacs) in their abdominal wall and testes that produce sperm. These also secrete hormones that control the development of male characteristics.
(Female shark above)
FEMALE:
Females have a pair of ovaries where eggs are produced. These also secrete hormones that control the development of female characteristics.
I also notice that in this picture, the female shark does not have an anal fin, and their tails are very different shapes. Are these from different species of shark, or do sharks really just have that much sexual dimorphism?
@redknight7146 OP is showing two different species of shark in their example. The male is a kind of houndshark, related to the leopard shark (Triakis semifasciata), in the order of carcharhiniformes. The shark that’s being shown as a female is of the order of squaliformes, a spiny dogfish shark (Squalus suckleyi). Squaliformes lack anal fins. The greenland shark and pacific sleeper shark are also squaliformes. Males and females of any given shark species possess the same fins. The only sexual dimorphism, other than reproductive organs, is size. Female sharks generally grow larger and have thicker dermal layers than males.
Today's mood
how have you been?
Update:
—-
🎉
Shark Fact 8: Respiratory System
Nurse Shark
Some species of sharks have a spiracle that allows them to pull water into their respiratory system while at rest. Most sharks have to keep swimming to pump water over their gills.
A shark's spiracle is located just behind the eyes which supplies oxygen directly to the shark's eyes and brain. Bottom dwelling sharks, like angel sharks and nurse sharks, use this extra respiratory organ to breathe while at rest on the seafloor. It is also used for respiration when the shark's mouth is used for eating.
Some sharks, like the whitetip reef shark (Triaenodon obesus), can respirate while stationary via buccal pumping; wherein water is drawn into the buccal cavity by the opening of the mouth and then exhausted through the gill by the closing of the mouth.
Shark Fact 8: Respiratory System
Nurse Shark
Some species of sharks have a spiracle that allows them to pull water into their respiratory system while at rest. Most sharks have to keep swimming to pump water over their gills.
A shark's spiracle is located just behind the eyes which supplies oxygen directly to the shark's eyes and brain. Bottom dwelling sharks, like angel sharks and nurse sharks, use this extra respiratory organ to breathe while at rest on the seafloor. It is also used for respiration when the shark's mouth is used for eating.
she was the first victim of cancel culture
Okay fuck it if this post reaches 666k notes by the end of 2023 I'll practise basic self care
Why 666k? Because it's funny and impossible so good fucking luck
Well, OP, I’m officially invested in this shit. Your whiny ass is doing self care if I have to drive to your goddamn house and do it for you.
By Talos this can't be happening
reblog this everyone i wanna see what happens when op’s reverse-hubris forces them to practice basic self care.
why? because it’s funny and completely possible actually so good fucking luck op
I figured out roughly how many notes it's been getting per day and multiplied that by the number of days left until the end of 2023
If we keep it going at this rate we'll be far past 666k
IMPORTANT
Okay so clearly I've underestimated y'all
So how about we make this more interesting?
I will practise self care if this post reaches 666k BY THE END OF 2022
Op you have fuckethed with the devil this post has gained 30,000 notes since I reblogged it last night
OP I hope you are ready to practice some self care because if there's one thing the gremlins of tumblr love it's a challenge.
i normally hate these "oh noo don't give me a ton of notes" posts but this one? this one i love.
posts that have 666k notes TO ME. and hopefully to you, too, OP. 💜
Let's all practice self care if this post hits the magic number…
YALL HELP US
@bigfootshonkers @dollopheadsandclotpoles @gwaine-the-rock-johnson @hannahhook7744 @knightofwoodsbeyond @reality-schmality @thirteenthedoctor @yoursassybookwormfriend if you want to of course @fuckyeahsnackables
Op telling us we'll never make it to 666k by the end of 2023 (only having to make it 2022 after all):
Us:
I was going to wait until y'all hit the mark, But I feel like I should say this now
When I made this post, it was supposed to be a joke
I mean, none of my posts ever get more than 20 notes if I'm lucky, so what are the odds of one reaching 666k? Impossible, haha
But then, something happened, something I didn't expect
People actually began to... like it? And... reblog? And comment?
Before I knew it, my notifications were swarmed with comments after comments after reblogs after comments all on this one post
Then, still in the mindset of this being a joke, I realised I'd made the goal too easy, so I upped the stakes
But... the notes just got more frequent from there
And it started to hit me just what was happening
For a while, I was overwhelmed with a feeling
A feeling I wasn't used to
It was like... all of a sudden... I mattered...
My existance was actually noteworthy
People actually... cared?
It wasn't a game anymore, it was a race to assure a stranger on the Internet that they were actually worth something
Hundreds of people all gathering in one online place to help out
Leaving messages and well wishes
Making me smile
Making me laugh
Funny comments
Jokes
Fun facts
Even simple comments
It all suddenly felt so real
This was never a joke to you
This was important
And I won't let any of that go in vain
So... stay tuned I suppose
I'll look after myself, and I'll post proof of it too
I'll catalogue every time I put my health first
Physical and mental
I'll acknowledge my bad days and celebrate my good days
But most of all
I won't forget this
Any of this
Ever
(Tagging all the people in that screenshot)
@deepsea-bathyna @royalsampaguita @timeturnerturns @twerkyvulture @reblogspamletsgoooo @gender-crisis-time @obsidianstrawberrymilk @shana-rosee @thefandombringer @sunshinedarlingiloveyou @bregee13 @moonlarking-blog @arcan6yo @crazyw3irdo @xinea @ghastmaskzombie @killthestairs @abalidoth @leesbian42
well, fuck, sometimes you have to hit reblog as well as the little heart
if practicing self-care truly is something that 700,000 other people can cheer us into doing for ourselves, then i wish that for OP and for myself and for every one of you, because we're all in this together. <3
If this ain't me
Me, bleeding profusely from a missing leg as I’m being dragged onto the beach: THIS WAS A STATISTICALLY UNLIKELY OCCASION, IF THE SHARK WANTED ME DEAD I WOULD BE DEAD. SHARKS ARE IMPORTANT FOR THEIR ECOSYSTEMS I DO NOT CONDONE ANY ATTEMPTS TO HUNT THIS SHARK
do not use betterhelp. do not support betterhelp. do not believe betterhelp.
they:
-do not vet their therapists
-forcefully shut down negative commentary
-lie to therapists
-lie to consumers
-trap therapists in exploitative contracts
-sells users data
etc
Since I know a lot of my followers are also LGBTQ+: Pride Counseling is operated by the same company as Better Help, so don’t use them either.
Now tell me this cunt int smooth
Rating: Cute
Chewing on boats is a common behavior of healthy domestic cats. This cat is likely chewing on a boat as a form of playing.
Shark Sense: 04
A Night Shark's green eye
Most sharks can see well in dark lighted areas, have fantastic night vision, and can see colors. The back of sharks’ eyeballs have a reflective layer of tissue called a tapetum. This helps sharks see extremely well with little light.
I have a shark question! Why are different shark tails different shapes? What makes it good to have a symmetrical tail for a great white while cat sharks have the little lobe type tail thingies?
I think that this might constitute more than one question, lol.
About 'dem shark tails
Shark tails, like most things, evolve depending on things like environment, diet, hunting, general physiology and so on. So, in this case, sharks can have different shaped tails because they need a different shape for... swimming faster (Mako shark), stunning prey (Thresher sharks), fast take off for escape (Angel sharks), and so on.
Shark tails are like the propellers on a boat. Some boats need larger propellers because they're big, some because they need the speed, and some need asymmetrical ones for whatever reason. The same goes for shark tails.
The lifestyles of some sharks mean that they have to have long tail lobes (top and bottom), a longer top lobe, or a longer bottom one. This physiological variation can be seen pretty clearly in Thresher sharks compared to Great Whites compares to Angel sharks.
[source: shark-world]
The caudal fin aka the tail, affects thrust, velocity, and speed when swimming. Some sharks can't swim all that fast (though don't be fooled into thinking they're slower than you are in the water: they're not) while others can shoot off like a pop-rocket suddenly with a flick of their tail. Some sharks use their tails for communication (shark body language yoooo) though the Cookiecutter shark, which I talked about here, is one of the few with bioluminescence in their tails that they use to communicate and attract prey for- ya know- dinner.
Anyway. The caudal fins of sharks can be categorised into several groups, depending on different evolutionary purposes of the tail adaptations.
1. Typical sharks: the upper lobe of the tail is longer than the lower and has a little upward angle. Great White sharks and Threshers have tails like this.
- Note: not gonna lie, when I see the shape of a Great White's tail, i can't not see the way Kermit's mouth opens comically wide as not being dissimilar.
[source: blogspot]
2. Fast swimming sharks:
these tails are crescent shaped with the upper lobe extending further out, but not too much (not up, out as in horizontally when looking at a side-ways view of the shark) with a little divot in the bottom of the top lobe. The picture below shows what I'm trying (badly) to describe. Fast-swim sharks tend to be open ocean kind of swimmers, so having a good caudal fin that lets you swim at a decent speed without costing you too much energy is *insert ok-fingers emoji*.
[source: github]
3. Benthic (heh, ben afflick thicc) sharks:
the top lobe of the tail is angled slightly and pretty darn long compared to the bottom lobe. They don't turn all that quick or swim all that fast, but they tend to also swim more like eels with the wiggles rather than the loooooong swish like a Great White. These kinds of sharks spend a lot of time on the ocean floor so they're basically the Carpet And Ground Sharks Of The Ocean and have tails suited to that lifestyle.
Note: Houndsharks are Benthic. As are Nurse Sharks, hence the image below showing the eel-like tails they have.
[source: Shark Research Institute]
4. Cirrhigaleus and Squalus genera sharks:
the names sound very fancy and Academic but they essentially mean the Dogfish shark category. Interestingly male and female dogfish have slightly different tail shapes. Female dogfish tails are a little... uh puffier I guess. The images below show a male (1) and a female (2)
[source: image 1, male dogfish]
[source: image 2, female dogfish, shark trust]
You can see that the female's tail is smoother, with less sharp definition like the males. They're still the same species though. Dogfish.
Now, interestingly enough, the longer upper lobe of a dogfish's tail doesn't slow it down. It can still swim fast, still rack up some speed quick, and maneuver well. This is because the spine of the dogfish extends through the top lobe at a lower angle than the lobe itself (you can see that in the pictures).
If you've read my other Shark Facts asks, you'll have probably seen the recent one about Great Whites and their dorsal fins being designed in way that makes them more rigid the faster they swim. If you haven't then it's here. Anyway, the same sort of logic applies. More rigid top lobe, the better it is for fast swimming.
5. Angel Sharks:
last on our list of shark tail types, we have Angel sharks. Honestly, these sharks have a larger bottom lobe than they do an upper lobe because they tend to be the I'm Going To Sit Here And Not Move For A Lifetime Then Shoot Out From Beneath You And Eat You. These shark tails allow the sharks that have evolved them to have a higher percentage of speed/velocity/acceleration in situations where they need to haul ass quick.
You can see the bottom lobe of the tail of the Australian Angel Shark is larger than the top lobe in the image below. They look, honestly, not unlike a ray but with a thicc tail instead of a needle of death (if you're a stingray, that is). You can definitely tell that sharks and rays are related when sharks like these exist, can't you.
[source: wikipedia]
What makes it good to have a symmetrical tail for a great white while cat sharks have the little lobe type tail thingies?
Okay so, I think you can guess what the answer to this specific question is if you've managed to read all the droning on I've done above. If not, then cool, I'll cliff-notes this shit.
1. Great White sharks need tails for speed and agility in the ocean, but also tails that aren't like the Basking Shark because they also go into shallow waters.
2. Cat sharks (my bae's) are ground sharks. Great Whites are not ground sharks. Tail differences are expected.
3. The image below shows you the differences in a Catshark's tail and a Dogfish's but you can see how it's considerably flatter on the top lobe than a Great Whites is. This is because, like Dogfish, Catsharks hunt specific types of prey (small fish, crabs, basically the stuff of the shallows/mid-depth waters of the world)
[source: wildlifeonline]
Basically, the differences can only truly be summed up with the following images.
Great Whites:
[source: knowyourmeme]
Catsharks (when threatened, I shit you not):
[source: memegenerator]
I hope this has been informative, educational, mildly entertaining and, as always, made you love sharks more.
After all, statistically speaking, sharks aren't the deadliest thing in the ocean to humans. Australian Box Jellyfish exist after all. As do Coral Reef snakes. Blue-Ringed Octopus. Pufferfish. And Stonefish.... so yeah.
A shark might bite ya, but it's not gonna kill ya like a pufferfish might just for the hell of it.
The ocean is a hellscape and we evolved outta that shit a couple million years ago, why we wantin' to go back in there, huh. Apologies I've been watching Casual Geographic on youtube, the whole "no ocean swimming advised, it deadly" vibes be spreading
Shark Fact 06:
(Great White Shark skin up close)
Shark skin feels exactly like sandpaper because it is made up of tiny teeth-like structures called placoid scales, also known as dermal denticles. These scales point towards the tail and help reduce friction from surrounding water when the shark swims.
This post feels like holding up a lance in a thunderstorm
They misspelled "silk."
It doesn't have an a-n-d-p-a-p-e-r.
Sharks are smooth
Sharks feel like silk in one direction and like sandpaper in the other direction. They are simultaneously smooth as fuck and sharp as fuck because they are just that cool. Also their skin sparkles when the light hits it. Behold the duality of shark and be humbled.
I feel like a lot of you never touched a fish before. All fish have scales, it's just that shark scales are a tad better than ordinary fish. But ultimately, their function is the same.
Just go and touch a fish from the market. The shark's skin is basically that but amplified.
Nah, man. Everyone knows sharks are smooth as hell.
When working with an octopus…
There are many benefits to being a marine biologist.
Shark Fact: 07
Scientists age sharks by counting the rings on their vertebrae.
Vertebrae contain concentric pairs of opaque and translucent bands. Band pairs are counted like rings on a tree, and then scientists assign an age to the shark based on the count. Thus, if the vertebrae has 10 band pairs, it is assumed to be 10 years old. Recent studies, however, have shown that this assumption is not always correct. Researchers must, therefore, study each species and size class to determine how often the band pairs are deposited because the deposition rate may change over time. Determining the actual rate that the bands are deposited is called "validation."
