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79

To be annoyingly clingy Your super lobsters seems to have the ability to hunt anything. The barbs makes it easier for a team of them to hunt prey much larger than themselves. The main purpose of barbs is, as you state, to remain attached to whatever you are trying to kill. When hunting in a team after large prey, the first of the lobsters to ram it, and ...


62

Would you be interested to know that annually, Jellyfish kill more than ten times as many people as sharks do? Not bad for a creature that is 95% water and doesn't have a brain! That being said, aside from stinging people to death and weighing down fishing nets, jelly fish are pretty slow and useless (6m/min is considered fast for a Jelly fish). They wouldn'...


51

Give that Columbus' craft were built using Carvel construction (butt jointed wood caulked with tarred hemp that is hammered into the joints and then a coat of tar over everything beneath the waterline), and given that we have already found oil-eating microbes to exist.... imagine hitting a massive, dense plankton field saturated with hungry microbes in the ...


51

This is the four-eyed fish: It has only two eyes, but it two pupils and two retinas in esch. It evolved to hunt by the water surface, catching prey from both above and below. Where there is an evolutionary pressure, there is a way to evolve. This fish proves that what you want is possible. However, do notice that this fish evolved multiple pupils because ...


47

No. Jellyfish are osmoconformers Osmoconformers are marine organisms that maintain an internal environment that is osmotic to their external environment.[1] This means that the osmotic pressure, or osmolarity, of the organism’s cells is equal to the osmotic pressure of their surrounding environment.... Most osmoconformers are marine invertebrates ...


45

Because you are a sprinter only (in contrast to your prey) Some animals such as cheetahs are not capable of hunting a prey such as a gazelle for more than a few hundred metres. The gazelle is capable of long distance running. So their tactic is super high speed (fast land animal on earth) on super short distance, knocking down their target. Obviously in ...


43

Phase 1: The Extinction Most life in the sea would die out almost immediately. Saltwater fish, invertebrates, and most importantly plants and microbes are finely-tuned for a particular level of salinity and their cells would burst under the osmotic pressure. Sea mammals and reptiles can tolerate the change better, but since these animals tend to be in the ...


43

No Megaladon is not fundamentally a more fearsome or ferocious beast than a sperm whale, which is also carnivorous, of similar size, probably smarter, and has as documented capability to sink 240 ton sailing vessels. Humans have hunted sperm whales, probably since pre-history. Even to the modern day, they do it by jumping off a boat and stabbing them with ...


42

Now kids, don't try any of what you are about to read at home. You do not want to mess with the Geneva Convention. I am going to answer both, how you can weaponize jellyfish (sea jellies, to be pedantic) and how to take what we've learned from jellies to make more powerful weapons. First off, start your breeding program now. You are going to want lots of ...


42

That's where its food source is. Most algae is found near the surface of the ocean, so if this creature has a semi long neck, it can swim gently along moving its head back and forth, up and down taking in the algae and anything else it finds. It stays at or near the surface as it's an air breather, so swimming under the water and then surfacing takes ...


38

Rolling attack - Have a heavy keel I just wrote a big post about naval architecture principles, much of which applies here as well. To minimize the chance your ship rolls, attach a heavy keep to the bottom of it. In the picture above, the sailboat has a lead-weighted keel underneath the hull; this drops the center of gravity nearly to the bottom of the main ...


30

A walrus A hippo Both of them can swim much faster than a human being, despite the clumsy looking proportions and giant weights. Next are the winners of different length swimming contests in Dubai 2010 (FINA) as stated on the wikipedia page. I am only posting their names and not their swimsuit images to evade creating controversy here. Ranomi ...


27

They feed through their horn There are animals that already do this, the most famous of which are leeches, ticks and lampreys. They attack their prey, latch on, feed, then let go once they're either full or in danger.


27

Needs sunlight It could have a usage for sunlight. Maybe a system similar to how plants use sunlight in photosynthesis. Heck, it could be exactly that. Make it have cells with photosynthetic properties on its "back". That way, if it dives, it makes less food. It means that it can dive if you ever need that (for design reasons like mating; or for whatever ...


26

I'm going to assume that when you say "Kraken" you mean "giant octopus monster" meaning something biochemically identical to a modern octopus but huge. I'm also assuming that the water stays gone and the environment is perpetually dry. Given those assumptions the real world example of seal carcasses in Antarctica's Dry Valleys should be educational. Those ...


23

This is not as straight-forward as it sounds. Some problems as I see them: 1. Oceanic Exploration Not a New Thing At the time that Columbus "discovered" the New World, the Vikings had already started and abandoned settlements in North America. Furthermore, many civilizations had already dabbled in oceanic exploration, notably the Chinese. There is also ...


21

The most realistic way—historically correct, even—seems to be a case of the overly hungry naval shipworm (Teredo navalis var. esuriens). Columbus had a large problem with them, the knowledge about these critters got lost at his time and he wondered why his ships were literally falling apart under his feet1 (you don't see them, their entry holes ...


19

You're going to want to obtain some whales. Not only are they the largest mammals alive, they also have the largest muscles. Whales travel in pods, the equivalent of a "pack" of wolves. They're strong, and should be able to lug your iceberg-storage system around for you. They also breathe air, so they can take advantage of the holes your mermaids cut in ...


19

A cloud of smaller host creatures scatters the sonar. The squid is followed by a cloud of small creatures that scavenge the scraps of the squid's food. In return they serve to scatter the sonar waves of a sperm whale. In order to scatter the sonar properly, the space between the creatures should be on the same scale as the wavelength of the sonar. We can ...


18

Evolution would select for human style breasts ...given a few things are true. First, humans have effectively removed predatory pressure as a cause for human evolution, and with sapience I would say things would be the same for your merfolk. Without this pressure the selection for reduced breast size/improved aqua-dynamics simply doesn't exist. I don't ...


18

If your kraken is basically like a giant squid, we can take a two-pronged approach to defend against all of your attack methods. First we want to prevent the kraken from grabbing hold of your ship to be able to rip it apart or roll it. Since the main force involved here is suction, we will cover the hull of your ship with metal plating with small holes ...


17

Life would not be able to evolve in this short amount of time. Organisms able to survive the lower salt concentrations (of which there would be some in the ocean) would survive, organisms not able to survive the lower salt concentrations (which would be most of the organisms in the ocean) would go extinct. This disruption to the food chain would cause even ...


16

Buoyancy is a big deal for sea creatures. Pretty much everything living on or in water have a density that makes them naturally comfortable (i.e. energy efficient) only at certain depths, and changing depths without also changing their density (i.e. via lungs or air sacs) requires significant effort. Take ducks, for example. They're very buoyant; they can ...


16

Not possible. You land dwellers need the ocean to survive. Don't forget that the oceans are part of the water cycle. If they are so messed up from radiation that no life can thrive in them, then the water vapour will be extremely radioactive too. Everything will die in areas where it rains. Also don't forget that water is actually one of the most ...


15

I've a few thoughts: Similar to the use of specific geometry and materials in stealth aircraft and watercraft to foozle radar, one could envision a very bright colossal squid draping itself with carefully-orchestrated kelp stalks and fronds to disguise its form, and to both absorb and randomly scatter the acoustic energy of a sonar ping... Or possibly there'...


15

https://www.livescience.com/54870-giant-squid-may-be-school-bus-size.html suggests that existing giant squid could reach 20 meters in length. Given a lack of whales and the biological variations you've listed it seems entirely plausible for squid to reach the sizes you describe.


15

There are a lot of such organisms right here on Earth. Undersea volcanic activity produces hydro-thermal vents. These are places where water is heated and then rises out of the sea floor. Typically this also brings with it a wide variety of chemicals that are ordinarily not available in such quantity in the ocean water. And there are organisms that find ...


14

Mega-AquaBoa-Constrictor The problem I have with animals biting the ship is that one bite would likely deter them. It seems like a lot of sea animals like sharks usually take one bite of something that they don't like and then move along. A hyper-evolved boa constrictor that has grown substantially large and evolved to adapt to deep sea water would be ...


14

Note that whales have no wings, so they cannot fly like a bird or a bat; they would have to fly like a balloon or Zeppelin. Basically, you need to get their density down to less than the density of air. Since whales can swim under water, their density should be approximately that of sea water, which according to Wikipedia is $1.025~\rm kg/l$. Air, on the ...


14

I don't think you want bipedal. If they are octopus-like, they should not be limited to just 2 legs for locomotion. Octopuses are amazing and have no trouble moving on land for short periods (they're only limited by the fact that they can't really breathe air.) As for their limbs, octopi have no bones. They are unique, and I suggest you study the very ...


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