100 votes

Can a person survive on blood in place of water?

Blood is not a good source of water. 1 liter of blood contains about 800 mL of water, 170 grams of protein and 2 grams of sodium (calculated from the composition of lamb blood). When metabolized, 170 ...
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  • 7,949
28 votes

A weird-looking fish with a shield

This is a species in the Peristediidae family, commonly called armored searobins or armored gurnards. found in deep waters around the world, with most species in tropical regions. They are related to ...
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22 votes

What exactly is this small puffer fish doing and how did it manage to accomplish such a feat?

A tiny Japanese puffer fish creates a grand sand sculpture on the featureless seabed by using his fins to dig furrows. He uses this to attract the attention of passing females. Why do puffer ...
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  • 1,552
19 votes
Accepted

What is this fish?! Is it even real?

Original Answer It looks to me like a species of sculpin, for example, the "short-horned sculpin" Myoxocephalus scorpius. http://www.luontoportti.com/suomi/en/kalat/short-horn-sculpin Best answer ...
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  • 8,031
18 votes

Can a person survive on blood in place of water?

You can drink blood of course to a minimalistic amount (eg- a few teaspoons ) and also if blood is free from pathogens. But it should always be in very small amounts and from suitable donor. Here's ...
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  • 559
16 votes

What exactly is this small puffer fish doing and how did it manage to accomplish such a feat?

This "nest" is created by a male pufferfish for both courtship and for rearing young. The male puffer fish uses its body and fins (a combination of pectoral, anal, and caudal -- see here) to ...
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15 votes
Accepted

What sort of fish is this?

That is a blue parrotfish (Scarus coeruleus): (photo: Marc Tarlock via Wikimedia Commons)
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  • 8,718
13 votes

What is the difference between the evolution of fins in whales and fish?

I agree with you that the question is ambiguous, and also that the most sensible answer would be C. However, one could make a more or less reasonable argument in favor of several other answers, too. ...
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12 votes
Accepted

How can a tongue-biting parasitic arthropod become a fully functional tongue?

Short answer There is no evidence whatsoever that the parasitic arthropod Cymothoa exigua develops itself into a functional tongue. Instead, it consumes the fish's tongue and occupies the freed buccal ...
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  • 51k
12 votes
Accepted

How long do fishes survive in a milk environment?

I can't support this answer with scholarly articles. But it's an interesting question if you think of milk as highly polluted water. Water from a tap (which is what goldfish usually live in) is '...
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11 votes

How do fish communicate?

There are a variety of fish species that produce sounds, including many species of Bocaccio (i.e. rockfish). This article is a great resource for learning more about 'fish choruses', a phenomenon ...
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11 votes

Can you get enough water by eating only fish?

If you have a man in a box scenario where you only look at numbers, the answer is, no, he won't last 14 days.[1] The difficulty with this question for me is that the body doesn't always behave the ...
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11 votes
Accepted

What kind of fish is this?

Its a Giant Gourami, Osphronemus goramy. The giant gourami (Osphronemus goramy) is a freshwater species believed to be native to Southeast Asia, and has been introduced to other parts of the world. ...
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  • 8,754
11 votes
Accepted

Help identify these (two) fishes - Netherlands

The second fish looks like a rock gunnel (or Butterfish; Pholis gunnellus). This is an eel-like fish found in the intertidal and subtidal zones of the North Atlantic. Interestingly, the rock gunnel ...
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10 votes

Can a person survive on blood in place of water?

Here is a specific account of a person surviving at sea drinking turtle blood, while eating some fish and drinking some rain water. Several peoples have a habit of drinking raw animal blood, at least ...
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9 votes
Accepted

Can prawns be classified as fish, or is their position ambiguous?

Introduction to phylogeny What makes that two species being closely related or not has nothing to do with whether they look a like or whether they live in similar environment. It has to do with their ...
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  • 67.5k
9 votes

Can't identify this fish caught off NC coast

i think this is a frogfish. there is multiple types of this fish. i think this is an Ocellated frogfish. frogfishes related to anglerfishes. memorizing animals by classification eventually helps with ...
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  • 560
9 votes
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Worm found inside of wahoo

It is Giant Stomach Worm (Hirudinella Ventricosa). It is a platyhelmith parasitic to Wahoo fish, feeding on its blood and found inside the stomach. It makes 98% of Wahoo's parasitic infections. ...
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  • 8,754
9 votes
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What fish is this?

I think this is probably a checkered puffer Sphoeroides testudineus based on your location and picture, with the wave-reflection patterning on the dorsal surface and ventral speckling the most obvious ...
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  • 35k
9 votes
Accepted

Do schooling fish make sounds that predators could detect?

Schooling fish do produce sounds voluntarily and there is a cool library of recordings from various species available via Discovery of Sound in the Sea: https://dosits.org/galleries/audio-gallery/...
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8 votes

Why does temperature shock kill fish?

This due to a phenomenon called "cold shock". This induces a number of physiological changes in the fishs metabolism and also in its behaviour and can lead to death. The first paper cites some ...
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  • 49.1k
8 votes

How do fish communicate?

I second MZiegenhorn's answer and Xavier Mouy's comment that a variety of fish species produce sounds, and I'll shamelessly refer you to our new website FishSounds for an inventory of published ...
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  • 391
7 votes
Accepted

About sharks and how they find fish

Sharks sense their prey with the normal senses, they see, hear and smell them. They have a remarkable sensitive sense of smelling, which enables them to sense highly diluted traces of prey. They can ...
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  • 49.1k
7 votes
Accepted

What happens when someone is stung by a jellyfish?

The problem is that box jellyfish doesn't specify one jellyfish but a group of different jellyfish. Some of these are highly venomous - I pick here Chironex fleckeri, as this is often called "the most ...
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  • 49.1k
7 votes
Accepted

What are fish seeds?

Fertilized fish eggs are known as Fish seeds. In simple words, they are the baby fishes used for seeding new Ponds in fisheries. They can be used in 4 stages: Hatchling : Larvae stage where it have ...
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7 votes

Why don't fish get hurt with so many sharp fish bones?

Connective tissues prevent fish from being hurt by its bones. They surround the sharp bones so that the bones do not hurt its organs/flesh. However Of course the bones can hurt the fish, but the ...
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7 votes
Accepted

Is the fin of ray-finned fish live tissue or more similar to scales?

In teleosts, the fin skeleton is made of structures called lepidotrichia and actinotrichia, whereas homologue structures called ceratotrichia are found in the fins of the chondrichties. These are ...
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7 votes

What are these animals, and what happened here?

That's likely a raccoon and a dead fish (salmon, perhaps). For the animal on the left: notice the ringed tail, foot anatomy, and lighter foot color, and variable (light/dark) fur color: University ...
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6 votes
Accepted

In practice, do fishes die from old age?

Yes, at least some fishes have intrinsic lifespans and deaths that are related to their own life-history and not to external forces such as predation or disease. Fishes show three types of ...
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  • 5,794
6 votes

Help needed in fish identification

It looks like southern platyfish (Xiphophorus maculatus) to me. Courtesy: http://aquaticszone.blogspot.in/2011_04_01_archive.html
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