Questions tagged [sea-creatures]

For questions involving creatures in seas/oceans. This tag is useful when paired with a broader creature tag such as "biology," "creature-design," or "xenobiology" in order to provide the most specific information possible.

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3answers
123 views

How and why would the sea-scorpion wound those who hold it?

The sea-scorpion is an average-sized sea creature resembling a terrestrial scorpion, and which has a rather unique feature: Despite an apparent lack of spines, claws, or other obvious methods of ...
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2answers
83 views

How would aquatic life adapt to the oceans becoming highly corrosive?

The reason for the corrosion is relatively unimportant beyond that it is "high tech" in origin, in contrast to the society in my setting (It could be a complex mix of industrial pollutants ...
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2answers
520 views

Could this idea for an anatomically functional merfolk “sound” plausible?

This anatomic conception of merfolk (mermen and mermaids) is an amalgam of biological particularities found in in sea mammals (dolphins, whales, manatees, sea lions) and sharks. Some are not found on ...
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2answers
1k views

What effect would living underwater have on a mermaid's skin?

Mermaids are commonly depicted as mammalian, human-like creatures from the waist up and scaly fish-like creatures from the waist down. What properties (color, texture, etc) would their mammal skin ...
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10answers
3k views

Living biological boats? (Jasconius)

There's this creature that swims over the surface of water and it's giant, almost the size of a whale and has thick scales as armor over its back. This creature almost never dives underwater so from ...
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18answers
11k views

An underwater creature that could take down a boat

Imagine that when Christopher Columbus sailed West in his Carrack to travel around the world to reach India, he had never made it to land, because halfway across the Atlantic Ocean between Europe and ...
4
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2answers
220 views

How could exist and how be the lifestyle of a living raft biome?

Raft biome consists of a trunk or a group of plants that float in the sea and cant transports little animals like reptiles, birds, bugs or rodents, with this method many species can travel large ...
2
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2answers
206 views

How could functional tentacles out of water (or similar structures) exist? [duplicate]

It is a common sight a lot of speculative terrestrial cephalopods and especially octopuses and not just that also is common see fictional works with creatures or characters with strong tentacles that ...
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5answers
1k views

Could a Mosasaurus destroy a ship?

Would a fictional relative of a Mosasaurus, the fictional one being a tad bit bigger, be capable of destroying a ship? For the purposes of this question, assume a wooden ship of comparable size and ...
2
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4answers
419 views

Could a mature (and giant) lobster remain in sea water indefinitely without decaying?

My pantheon of storyline gods includes a "titan" of sorts, in the form of a giant lobster. At one point in time, she returns to the coastal ocean and exists in a meditative state on the seafloor for ...
4
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1answer
204 views

Scaling anthropomorphized 'ship girls'

Currently i'm building a world where conventional warship is largely replaced by Kantai, anthropomorphized human female posessing power of modern warship. They are basicly a human sized girl that is ...
5
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2answers
143 views

Variations on the “Ginsu Shark” Theme--What Would They Eat?

From 108 to 73 million years ago, the shallow seas of North America, Europe and southwestern Asia were the haunt of four species of a genus of shark scientifically named Cretoxyrhina. The chosen ...
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1answer
240 views

Fastest fish possible

I am trying to design the fastest pelagic fish that is mechanically possible. The fastest real life fish can swim up to 80 mph. What body design would allow a fish to swim significantly faster than 80 ...
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2answers
320 views

Creating an Anatomically Correct Lusca

The Lusca (its name meaning 'Octopus Shark') is a cryptid from the Bahamas, supposedly a 6-9 meter (or even 23 meter) long man-eating Octopus that lives within the blue holes, dragging victims down ...
9
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2answers
292 views

Anatomically Correct Giant Seahorses

This is a submission for the Anatomically Correct Series Giant seahorses are often portrayed in fiction as being ridden by merfolk or other underwater people. I'm wondering if such a creature would ...
8
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4answers
1k views

What would mer-folk use as lights and soft surfaces

I'm writing a story where one of the main races is orca (killer whale) mer-folk. Being orcas need to breath oxygen from the surface so do they, this said they live in a halfly submerged cave...but it'...
5
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1answer
136 views

How large could an aquatic humanoid get?

Vertebrates on land are limited in size by various factors. However, in the water, they can get much larger. How large could an aquatic humanoid creature (like cthulhu) realistically get, and what ...
9
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4answers
169 views

how big does my creature's organ need to blind or stun predator of all size?

Ok so my creature will look like this They're not big, about 2 feet tall. They're technically amphibians but have the scaly hide of a reptile. They live near the sea. Their life cycle is similar to ...
2
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2answers
165 views

Ningens / Humanoid whale-like creatures

Ningens are an old internet legend/creepypasta. Supposedly living in the polar regions of the globe, these creatures are described as having white-skin, a roughly humanoid structure with clear head, ...
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5answers
897 views

Anatomically Correct Mesopelagic Aves

This is a submission for the Anatomically Correct Series Recently I had a vision of a colossal underwater bird-like figure. I would describe it as follows: Roughly the wingspan of the length of a ...
49
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13answers
7k views

Why would an underwater creature remain lodged to its prey?

Enter the [Insert cool and awesome Latin name here] - this species is 3 times the size of a lobster from front to tail, and a powerful hunter. Operating in swarms, they are my worlds equivalent of the ...
4
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1answer
90 views

creature with retractable spikes

ok so i want to make a creature with a retractable spike in its body, (like it just comes out from its flesh) can this be biologically plausible, if yes, please explain and which part of the body is ...
3
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1answer
143 views

How large could sea creatures grow on a terraformed Ganymede?

If we assume a terraformed Ganymede has a global ocean roughly 800km deep, that food is bountiful, and that it has been populated by a variety of life from Earth, how large could these creatures grow ...
14
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2answers
828 views

How could an Earth-like planet develop huge pinkish-purple forests on ocean surfaces?

I'd really like to write a story taking place on an alien world that involves a totally new kingdom of life, and I'd like it to be at least somewhat realistic. The idea I have right now is a whole ...
3
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1answer
251 views

How do donut fish eat?

Imagine a particular species of eel that resembles the shape of a torus or donut. It is capable of generating an alternating electric current in the water as a form of communication between other ...
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1answer
94 views

Land and sea are infested by giant carnivourous squid/crab things. How do I survive? [closed]

So, recently, a bunch of Kraken eggs have hatched, bringing them back form a few centuries of extinction for unknown reasons. Also, turns out that when their sea-based population gets too high, some ...
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2answers
132 views

Something came from the sea. What does it attack first? [closed]

There is some sort of carnivorous mega-creature. What it is doesn't matter. What does matter is that it can kill pretty much anything. Imagine a mini-kaiju. Like, only the size of a double-decker bus ...
5
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4answers
426 views

Could a genetically modified coral polyp be used as a pathogen?

Is this even remotely possible? Source Outline: Coral Polyps (along with their copious Calcium Carbonate excretions) are the individual organisms that make up the super-organism we identify as ...
5
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3answers
875 views

Could coral float?

I've been thinking about worlds like Keplar-62e, thought to be covered in deep oceans, and wondering about floating reefs. Could a bio-structure substantially similar to terrestrial coral hold enough ...
14
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4answers
4k views

Hammering under water?

Long before you get to using fire to smelt metals, hammering is a much more fundamental requirement for basic technologies. Hammering lets you Flake stones to make stone tools Process food--grinding ...
27
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8answers
9k views

What if the ocean's salt level decreased by 50%?

What would happen to the fish/animals living in the ocean, if the water became 50% less salty, within the space of three months? Would everything die, or would they evolve very quickly? Related: What ...
6
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5answers
795 views

Humanoid based on Octopus: Flexibility and organ protection

I am planning on making a new species based on octopus and humans. Human in skeletal structure, Octopus flexibility. I am thinking of calling them octopeople. As far as flexibility, I am thinking of ...
27
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5answers
4k views

A fast aquatic predator with multiple eyes and pupils. Would these eyes be possible?

I’m currently in the works of an alien design, one which lives in the ocean most of its life and occasionally surfaces in shallow waters to mate. It has 4 eyes, with each side of the head having a ...
6
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1answer
333 views

what the aquatic creature need in order to live or survive in my acid water?

inspire by xenomorph acid blood from alien movies. so the water either rivers, lakes, and oceans in my world or some of the regions is highly acidic because some of the dirt or stone minerals content ...
16
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4answers
3k views

How to let a Whale urh… fly? [duplicate]

I have read about flying sharks that hunt birds and great monstrous flying whales, so I would like to know how a whale could conceivably start 'flying' in real life. I'm gonna just set Blue Whales as ...
14
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11answers
977 views

Writing system of blind, sea dwelling sentients?

So let's consider a species of blind, sea dwelling, squid-like aliens. They are sentient, intelligent and highly social. As their societies develop and their available knowledge increases they ...
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2answers
164 views

Underwater technology? [duplicate]

How would aquatic aliens create technology? ( Think late 90's style, and by that, I mean: Phones, metallurgy, electricity, public transportation (think trains), books (and ink that would not just ...
14
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9answers
5k views

Would evolution select for mermaids without breasts?

So ignoring all the other hydrodynamic inefficiencies associated with sticking a human torso on a fish body, let's just worry about those most distinct of human female features, breasts. The problem ...
10
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4answers
853 views

What attributes and how big would a sea creature(s) need to be to tow a ship?

I'm trying to come up with ways as to how a ship could travel places with a very low number of people (like 4 crewmen). One of the ways I like for how to do this is to have large sea creatures ...
18
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9answers
3k views

What underwater creature would be well-suited as a pack animal?

Suppose that there was a tribe of nomadic mermaids whose lives were primarily centered around following pods of dolphins to eat. They live in the equivalent of the frigid antarctic seas. As they ...
8
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4answers
695 views

How would thermophilic fish survive?

I'm designing alien creatures for illustrations, and I'm just sketching some that might live in areas with a lot of geothermal activity. So basically, animals that live around geysers and hot steam. I ...
11
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8answers
3k views

Under what circumstances would a nuclear war render Earth's oceans uninhabitable?

It's a bit more complicated. I'm creating a sci-fi world for a tabletop game. One of my created races is a form of humanoid octupi. My idea is for there to be a nuclear war that forces their species ...
4
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2answers
72 views

Order of Limb Pair Types for Amphibious Creature (Hexanewt)

I need to add a bit of descriptive detail on a species from a brief description. Essentially add a bit of finer detail to someone else's broad-strokes worldbuilding. An amphibious species' body layout ...
3
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1answer
668 views

Is bio-luminescence possible in aquatic mammals?

Could a species of aquatic mammals develop bio-luminescence? What kind of bio-luminescence would it be? What circumstances could lead to it?
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2answers
160 views

How could the hormones of an octopus affect an adult man? [closed]

Let's say the hormones of a Giant Pacific Octopus, 1-and-a-third years old, enter the bloodstream of an adult male. How would or could that affect him?
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2answers
6k views

A Freshwater Octopus?

One of the oddest of cryptids is an octopus haunting the lakes of Oklahoma, a landlocked state. The reason this is odd is that although freshwater mollusks are common, Cephalopoda (the class ...
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2answers
500 views

Shark vs. Sea Turtle--Who Has the Better Odds of Being Whale-Sized Planktivores?

In a hibernating speculative evolution project called The Speculative Dinosaur Project, the "speccers" feature a species of shark called Jasconius pelaganax, the Gigamouth, which is basically a ...
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4answers
232 views

What is holding the cephalopods back [closed]

We already know that cephalopods (octopi and squids) are kind of smart. They are smart enough to unscrew jars. Bet on football world cups (and even win some of those bets), disguise themselves, and ...
12
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5answers
3k views

Plausibility of squid whales

I am considering the possibility of having massive cephalopods evolving on my world and having them fill the niche of whales. I've heard about how whales have evolved to increase in size for the ...
5
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4answers
163 views

How to identify sapient jellyfish?

There is a sapient jellyfish species resembling the box jellyfish found to be lurking in the ocean today. A team of researchers took a sub and dived into the abyss to look for it. What kind of non-...