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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4
votes
1answer
95 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
149 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 ...
3
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2answers
89 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, ...
6
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2answers
167 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 ...
4
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1answer
68 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
votes
1answer
117 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 ...
3
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1answer
170 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 ...
0
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1answer
80 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 ...
-1
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2answers
124 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 ...
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 ...
28
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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 ...
1
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3answers
286 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 ...
5
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1answer
294 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 ...
1
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2answers
139 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 ...
10
votes
1answer
214 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 ...
8
votes
4answers
672 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 ...
10
votes
4answers
769 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 ...
5
votes
1answer
560 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 ...
4
votes
2answers
65 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 ...
1
vote
2answers
153 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?
-2
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4answers
215 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 ...
11
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5answers
838 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 ...
5
votes
4answers
124 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-...
6
votes
3answers
374 views

How do marine dragons evolve flight without any feathers and no hollow bones?

These dragons spend most of their lives in the ocean, however during the mating season they will migrate inland and gather together on a mountain top. Throughout the journey they will cease feeding ...
9
votes
1answer
116 views

Designing a somewhat realistic “Astomi”: Filter-Feeding Humanoids?

I've been thinking of reviving an old Fantasy idea of mine, and I recently came across a description of a group of mythological beings that piqued my interest, and which would actually fill a niche I ...
4
votes
3answers
224 views

Ocean travel in a world with sea monsters [closed]

How would sea travel develop if certain parts of our oceans were filled with monsters? The setting It takes place on our lovely Earth. No geography changed at all, and you'll see why I wanted to ...
8
votes
2answers
177 views

How would you go about seeding oceans of Europa with adapted Earth life?

How do you go about building a working Earth-like ocean ecosystem from scratch in Europa's subsurface ocean? On Earth, abyssopelagic species have evolved to live more than 6km below the surface. ...
12
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4answers
4k views

How long could a Kraken's carcass survive if preserved in salt?

I have a bay of water containing several Krakens. One day, due to the efforts of a magical organization, all of the water disappears. The Kraken fall and die on the bed of salt that is left behind. ...
-3
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3answers
160 views

Creature that can sleep/hibernate under the water for a very long time [closed]

There's a god that can morph into any creature he wants. He wanted to sleep for a very long time (like centuries), and found a perfect place at the bottom of a lake that is connected to the open sea. ...
4
votes
3answers
492 views

Brine pool ecosystems

(Question in highlighted text) So, the chances are that you've heard of brine pools, which form when methane erupting from the seabed expose ancient salt deposits - the concentrated salt mixes with ...
33
votes
18answers
5k views

How would a ship defend against a sea creature, and possibly win?

I have a Viking-inspired race living on a harsh ocean based planet with very rough and cold seas. In these seas there are giant creatures, not unlike kraken who frequently attack ships. I was thinking ...
6
votes
5answers
913 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 ...
6
votes
2answers
169 views

Explosive jellyfish

Could a creature like this exist? Jellyfish or cephalopod-like creatures that live in 'swarms' underwater. They float aimlessly around in a net formation. When one member detects prey below the ...
2
votes
2answers
148 views

How would giant penguins affect the arctic/Antarctic ecosystem?

So, I was reading about the Colossus Penguin and was wondering how adding them to my world might affect the arctic ecosystem in my world? Obviously, they would need to eat a lot of fish, squid, and ...
14
votes
2answers
692 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 ...
11
votes
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 ...
0
votes
3answers
261 views

Octopus ink contains micro parasites that act as acid

I'm building a story around a newly discovered kind of deep-ocean octopuses whose ink contain "parasites" which act as acid in organisms. These ink parasites can be used as a weapon of mass ...
10
votes
1answer
460 views

How large could my sea serpents be?

EDIT: (Important) M. A. Golding commented that the regalecid method of locomotion would be unfit for a constricting predator, so I have completely redone the taxonomy of the sea serpent. They are now ...
20
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5answers
1k views

Sonar Jamming Squids

Context In the arms race of survival many animals have developed ways of evading predators, but the animal I am interested in for this question would be the tiger moth. So basically these guys jam ...
27
votes
8answers
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 ...
7
votes
1answer
238 views

Water-walking animal

What are the requirements for mass distribution and body positioning that would enable a large creature (say, a panther) to walk on water (and still be able to dive down and swim if it wanted?) This ...
1
vote
1answer
191 views

Adapting organs, How would they adapt?

Okay so I get that for flexibility I need no bones. My octopeople do live on land so they do have lungs. But they are more amphibious than we are. So here is my proposed life cycle: Pregnant ...
6
votes
5answers
639 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 ...
2
votes
2answers
177 views

What aquatic creatures would survive a large-end mass extinction?

I want this world to have two things, typically on the complete opposite end of geological timescales: Land fauna is incredibly "Young" - Pretty much nothing larger than a "large" insect (Some ...
8
votes
2answers
1k views

Life in extremely low gravity water

Let's assume the planet has only one half the mass of the moon and is covered by shallow ocean. To eliminate water pressure at extreme depths, assume the ocean is also quite shallow, with a maximum ...
0
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3answers
250 views

How would a sea-dwelling species wage a war with humanoids (and possibly win)? [closed]

There are two dominant species on the planet Someplace. One is humanoid, much like us. They have modern-day technology, and have similar physical traits. There are around 1 million people in the ...
17
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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 ...
-2
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3answers
149 views

What are reasons a mer-person might speak English? [closed]

If such a thing would even be possible.
19
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9answers
7k views

Could a jellyfish be bio-engineered to convert salt water into fresh water?

For my future world, I've decided that coastal cities need fresh water and there isn't enough of it to go around. I don't know how jellyfish work. Is it feasible or completely impossible for ...