Questions tagged [marine-biology]

The study of organisms that dwell in the ocean or brackish waters.

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32
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2answers
88k views

How long can an octopus survive out of the water?

I saw videos of octopuses crawling on the ground and I was wondering how long an octopus can survive when out of the water? Does it depend on either its size (i.e., does a big octopus from deep sea ...
-1
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0answers
39 views

Why sharks need to be on a constant move?

Sharks need to be on a constant move in order to live. I heard two explanations for that fact: Sharks have no gills cover (like bony fish have). In bony fish the gills cover opens and close ...
0
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0answers
19 views

What are the most important structuring features of epipelagic habitats? How do these affect epipelagic zone animals?

The epipelagic zone is a featureless environment with no reference points. There's a lack of shelter from predators or substrate on which to rest. What other structuring features are there and how to ...
1
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1answer
39 views

Edible macroalgae?

I know that kelp is edible because the concept of eating kelp is all over the interwebs. However, there is incredibly little information available online about what species of "seaweed" is edible. I ...
0
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1answer
40 views

Help with identifying creature found in brazilian beach

I don't know if this is the correct place, but I've been looking for someone that could help me identify this creature I found while I was looking for shells. There are three mollusk-like "beings" ...
1
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0answers
15 views

Characteristics of a giant squid’s skin

Is the skin of a giant squid/colossal squid similar to the common squid? Does it possess chromatophores to change color? Or did it lose that ability because of the depth at which it resides or due to ...
0
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0answers
12 views

Why aren't diatoms' shells used as a temperature proxy, but foraminifera shells are?

Changes in oceanic oxygen isotope ratios (O-18 to O-16) are reflected in the shells of ancient foraminifera. But I never hear of diatom shells being used, even though they were/are at least as ...
3
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0answers
16 views

Effect of toxin-producing phytoplankton on zooplankton?

I've been searching for quite a while without really finding an answer to this question, so I decided to try it here. Some phytoplankton species produce toxins as a defense strategy. But what exactly ...
9
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1answer
106 views

What kind of fish is this white blue-stained fish?

This fish has been spotted at the Great Barrier Reef near Cairns (Queensland). I put a big effort to find it via Google but never could encounter anything similar. I have also made an attempt to find ...
3
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1answer
50 views

What's it called when a male seahorse gets “inseminated”?

I am looking for the scientific term for the process where a male seahorse receives eggs from the female. For example, we usually say, "the male inseminates the female with sperm." What is the correct ...
2
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0answers
54 views

What is this? I found it in tofino, Vancouver island

I'm wondering what this sea creature is that I found washed up on McKenzie beach in Tofino, Vancouver Island? It wasn't dried up or anything. I've seen hundreds before but I cant find anywhere on the ...
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0answers
41 views

DNA like marine animal or egg

What is the name of the marine egg or living being that is transparent like a jelly fish or a Venus girdle, with a shape like a DNA or better like a chain of infinites, long as half of a hand and ...
0
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1answer
31 views

Difference between Sphyraena obtusata and Sphyraena novaehollandiae

"Striped barracuda" is the common name for both Sphyraena obtusata and the Sphyraena novaehollandiae. Here's links to both fish species from fishesofausralia.net: S. novaehollandiae and S. obtusata ...
5
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1answer
94 views

Anyone know what this it?

More than 1 washed up on a beach in Ireland..close to some big jellyfish
2
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0answers
55 views

Recognise this thing found in beach?

Kindly help me identify this thing found in beach Chennai, India . Size would be just 1.5 cm in diameter..across maximum size. It's shelled and has something inside it. It make a small noise when it ...
2
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1answer
76 views

What are the teeth of the viperfish composed of?

One of the viperfish's (genus Chauliodus) most unique traits is the transparent, needle-like teeth. Some other abyssopelagic fish (e.g. certain angler fish) have similar teeth. I'm curious as to what ...
-1
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1answer
39 views

Can anyone help me identify the size of a mantis shrimp club?

The mantis shrimp punches with it's club to destroy its prey's shell. I found on the internet that its body size is around 4 inches. What's the size of it's club?
0
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0answers
35 views

Is this a living organism?

Is this thing a flower or marine plant?
5
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0answers
36 views

How old would seashells be if I found them 9 ft deep 30 miles from the ocean while digging a pond in North Carolina

This is a picture of some specimens that I found while digging a pond. I'm 30 miles from the coast in Wilmington, North Carolina and dug down about nine feet past the blue clay and hit a layer of ...
1
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1answer
100 views

Help in identifying marine specimen?

I came across this specimen which I assume belongs toeither the phylum porifera or to the coelenterata. Can someone please help me identify it? The specimen was found in Ayodhya, India.
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0answers
32 views

Why does the colossal squid range over only the Southern Ocean?

Wikipedia's article on the colossal squid gives the distribution as in the Southern Ocean only. It makes sense for many animals found in the Antarctic to not also be found in the Artic even if the ...
0
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0answers
17 views

Effects of Great Pacific Garbage Patch to Phytoplankton?

I was wondering if the decrease in light received by the area comprised by the Great Pacific Garbage Patch (GPGP) could affect Phytoplankton enough to reduce its potential in that area as a carbon ...
24
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2answers
3k views

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

I recently saw a video on youtube where it shows a puffer fish making intricate designs in the sand: OZZY MAN VIDEO The puffer fish made this design on the sand: What exactly is the puffer ...
29
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1answer
948 views

What strange jelly-like thing is shown in the photo?

What is shown in the pictures below? The photo was taken at the Australia's south coast (Queenscliff). The length of the thing is no longer than 50 cm... It doesn't move and has jelly-like consistency....
10
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1answer
105 views

Why are market squid attracted to fishing lights but also avoid naturally lit surface waters during daytime/full moons?

Squid fishermen use really bright lights (which can be seen from space!) to attract squid to the surface at night, but a lot of squid also naturally avoid surface waters that are lit during the day (...
8
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0answers
159 views

What is this underwater creature?

West Bali, about 10 meters deep. Body is roughly 10 cm across. Does not move.
2
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1answer
54 views

Help with jellyfish species identification

Our research group (Evolutionary Genetics Group, University of Zurich) has received a letter from a special needs child who has kindly asked us to identify three jellyfish species. Unfortunately, the ...
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1answer
67 views

What is this seaside thing?

I found this on the sand and I do not know what is it? I thought it is sea devil, however I checked google and it is not. Can someone tell me what is it(its name )
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0answers
42 views

Why are dolphins born tail first?

I heard most dolphins are born tail first. I have read many explanations from books and internet articles and they said that dolphins are born tail first to prevent them from drowning. But now I don'...
17
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2answers
889 views

A weird-looking fish with a shield

I found this photo in a local news page. The page claims that this fish is a new species that was found by a Malaysian fisherman. Is this true or is it a known fish and already has a name?
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0answers
27 views

Carbon Dioxide, sea water, diatoms, and oxygen

I recently viewed a documentary called “Flying River Observed in Tallest Structure in South America, National Geographic” (https://www.youtube.com/watch?v=HjpPsZTwsaM). In this film, as an aside, it ...
6
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1answer
296 views

What are the predators of Glaucus atlanticus?

I'm researching the Glaucus atlanticus, also known as the blue glaucus, among various other names, but after reading quite a few articles and searching on the Internet as many different ways as I can ...
1
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1answer
307 views

Do pyrosomes reproduce by ways other than cloning?

I know that Pyrosomes are large colonies of floating tube-like animals that live in the sea, particularly in the tropics. They are just like any type of free floaters I know that pyrosomes can ...
8
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3answers
5k views

What determines the colors and patterns of a clam shell?

Earlier this week I was looking at some bivalve shells that had ornate patterns which ranged in color from a light orange-pink to a deep orange-red. Here is an image I found online that seems to be of ...
17
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3answers
314 views

Why are the bodies of the Risso's dolphin covered in scratches?

Risso's dolphin in wild population seem to obtain scratches with aging. What is causing them and what do they mean?
6
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3answers
5k views

What is the fastest marine mammal?

When I did a research, most of the sources say that orca is one of the fastest. But I could not find a source that says it is actually the fastest. Some sources say that Dall's porpoises rival orcas ...
10
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4answers
636 views

What are the frequency ranges of most marine mammal vocalizations?

I am trying to determine a list of frequency ranges into which marine mammal vocalizations fall. Ideally, I would like a list showing where the most popular marine mammal vocalizations fall, followed ...
2
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0answers
58 views

marine animal tracking databases

Which databases you know that store data on tracking of marine animals? I am interested particularly on mammals (for which I know meop storing data on sea lions) but also on fish schools (not sure ...
6
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1answer
2k views

What percentage of fish are herbivorous vs. carnivorous?

It appears that the majority of fish we eat are carnivorous, such as salmon and tuna. This got me wondering how common herbivores and carnivores are among fish species. I couldn't find an answer to ...
3
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1answer
86 views

Can anyone tell me what type of fish this is?

Notice the reflective patterns on its underside. I think it must be a deep water fish. It was found washed up on the ocean sand in Myrtle Beach, South Carolina (USA) after a hurricane.
3
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1answer
156 views

Function of the spermaceti organ

What is the use of the spermaceti organ of the sperm whale? One possible theory considered is that it was used for floating and going underwater by heating/cooling the oil. However, it is a lot ...
8
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1answer
591 views

ID a shell from Puerto Rico

I recently found this in Rincon Puerto Rico on the beach. I assumed it was a baby sea turtle shell or some kind of turtle. Someone that frequents Puerto Rico said it was not. Does anybody know what ...
7
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1answer
196 views

Help identify these (two) fishes - Netherlands

Yesterday my kids caught these two fish. I tried to figure out what kind of fish (species and name, to tell my kids a bit more about them) they are but I was not successful. Today we made a trip to a ...
3
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1answer
97 views

What creature is this?

Found on a beach in Brisbane, Australia. Only a few cms of it was visible but I dug the rest of it out, it was about 20cm in length.
2
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1answer
46 views

Resources to learn about marine life [closed]

I recently saw the documentary series Blue Planet 2 and was mesmerised by it. Can someone recommend me some resources to learn about marine life? I am particularly looking for those that detail the ...
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0answers
65 views

How long could a shark breathe pepsi?

Sharks breathe seawater. Seawater isn't 100% pure water, but mostly water. Pepsi (other colas are available) isn't 100% pure water, but mostly water. How long would a shark be able to breathe if ...
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0answers
52 views

What kind of sieve does one use to extract meiofauna?

Suppose I have a core of sediment, and I want to extract the meiofauna from it, in order to study these organisms. According to the sources I could find, this involves using a very fine (e.g. 45 μm) ...
17
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3answers
6k views

Why is there a difference in the rotation of the tail fin in fish compared to marine mammals?

I've been thinking about this one, but I can't seem to find what causes this difference. All fishes that I've seen have their tail fin positioned vertical: But all the marine mammals I know have ...
12
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1answer
346 views

Did the construction of the Panama Canal lead to a huge change in the local marine ecology?

Before the Panama Canal opened in 1914, its two ends were only 77 km apart over land, but the closest sea route was 32,000 km long (around the entirety of South America) and passed through much colder ...
1
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1answer
305 views

What sounds deter sharks?

Have any studies been done to find sounds that alienate sharks?