Questions tagged [marine-biology]

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

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6
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1answer
28 views

By what mechanism do cephalopods regrow limbs?

As far as I can tell, there are two types of limb regeneration: epimorphosis and morphallaxis. Epimorphosis is used by animals such as amphibians and various phyla of worms, while morphallaxis is used ...
2
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1answer
67 views

Please identify this bone found on the beach

I've found it on the beach in Çanakkale, Turkey. Width 7.5 cm, height 5 cm. Inner hole dimensions are 2.5 cm x 3 cm.
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0answers
39 views

Do jellyfish have extra energy reserves for emergencies (a “fight or flight” response)?

My friend is writing a story about jellyfish, and we couldn't find out if jellyfish have the equivalent of a "fight or flight response" or an adrenaline rush. In other words, do they have ...
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0answers
26 views

Maximum Allometry of aquatic mammals omitting Kleiber's Law

As far as I understand, blue whales cannot get any physically larger due to the extremely demanding caloric intake it has on consuming large quantities of krill, not due to any other physiological ...
1
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1answer
68 views

Can someone identify this jellyfish?

Recently, I saw this video but I couldn't find out if it's CGI or if it's an actual jellyfish. If it's real, what explains its beautiful bioluminescence pattern? And could the output from the ROV ...
3
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2answers
305 views

Mangroves and desalination of sea water

I am not an expert but I guess that mangroves (or some other plants that thrive in sea water) perform some kind of desalination to extract fresh water from sea water. Is this true? If yes, What ...
4
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1answer
144 views

What is this sea shell?

Found in Belgrade, possibly carried back from the Mediterranean or Aegean coast.
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0answers
23 views

Pearl formation process: what is it called? How does it work?

I have heard a pearl is a disease of oysters. Astonished by the statement, I searched a bit [1] and I discovered that it is really a protection mechanism of the oyster. I know this defense mechanism ...
8
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1answer
705 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 ...
6
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1answer
2k views

The colour of aquatic plants found deep under oceans

I have read that many aquatic plants found in deep oceans are red in colour, however, I do not understand why. As red is the color which gets the least scattered it should be the only light available ...
-1
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1answer
41 views

Is insect farming more efficient than shrimp farming? [closed]

Insect farming is sometimes advertised as the way to feed the growing global population with animal protein in a way that is more efficient (in terms of protein yielded/feed consumed) than growing ...
0
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1answer
30 views

Do whales ever just hang out on the surface breathing?

You only ever hear of whales surfacing for a brief second to exhale/inhale before they dive back down. But do they ever just stay at surface level, laying there with their blow hole up in the air, ...
4
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1answer
64 views

Have I identified this species correctly? Weird ocean blob

I often comb the beaches in Santa Cruz (central California coast) for weird stuff that washes ashore. The waves have been a lot stronger than usual the last few days, and the today the beach was ...
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2answers
184 views

Can a shark stall?

Today in marine biology I learned that, like airplanes, sharks use their pectoral fins to generate lift. The question that neither me or my Professor know is if a shark can or cannot stall. A ...
4
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2answers
62 views

Why is the consumer/producer biomass ratio higher in the oceans?

According to Bar-on et al. (2018) (see figure 2), the terrestrial consumer/producer biomass ratio is 20/450 while the marine consumer/producer biomass ratio is 5/1 (in Gton of carbon). Why is the ...
3
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1answer
117 views

CO2 availability to phytoplankton in oceans and climate change impacts

I learned through research that increasing levels of atmospheric CO2 was increasing the acidity level of ocean waters. I then was looking into how this was affecting the phytoplankton and read that ...
2
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2answers
271 views

Do fish depend on plants for survival?

As far as I know, all land life depends on plants for survival. Plants convert sunlight to energy using photosynthesis, herbivores consume plants, and carnivores consume herbivores. All the energy is ...
5
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1answer
2k 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 ...
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0answers
21 views

Identification of Ulva lactuca

I am trying to find an ID guide that I can use to identify macroalgae. I specifically want to differentiate between Ulva species.
0
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1answer
41 views

Is life in the open ocean homogenously spread?

Obviously around land masses or in shallow water where reefs and coral may grow, life is diverse and numerous. But how spread out is sea life in the open ocean (for example, half-way between Hawaii ...
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0answers
19 views

How much decibel can a fish produce with swimming?

I am talking about any sound that is produced by the movement of the body of a fish when it propels itself forward. Can this sound, if any, be recorded with a decibel meter? If so, how much decibel ...
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1answer
130 views

How much can a blue whale lift? [closed]

A simple question really. Given that the buoyancy in water kind of helps them under water, I'd specifically like to know, if there was, for Example, a boat, how heavy could it be that the blue whale ...
2
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1answer
91 views

what is this marine creature?

I found this creature floating in the Mediterranean Sea, probably dead. I tried looking it up in the Marine Species Identification Portal‬‏ but I couldn't find anything like that. It looks like some ...
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0answers
53 views

Need help identifying what looks to be a skull

( BOTTOM VIEW )I was given this skull(?) by someone a few years ago, it was found washed up on a beach in Panama. I collect bones so usually I’m really good at IDing skulls and I’ve spent some time ...
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1answer
32 views

Can box jellyfish see with their eyes?

While normal jellyfish don't have any eyes, box jellyfish have 24 eyes. Looking into my question on the internet, in one answer on Quora to the question Do jellyfish have eyes?, it is said that: ...
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0answers
32 views

Harbor Seal behavior and personality

I'm doing some research on Harbor seal behavior, but I haven't been able to find much on general behavior such as personality, quirks, ect. Does anyone have anyone have any firsthand experience with ...
3
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0answers
27 views

Narwhal tusk evolution

I was reading about whales and wondered why did only narwhals, among all other species of whales, evolve to have tusks? Is there a specific environmental reason, for example something unique about the ...
29
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1answer
5k views

What is this strange sea creature we found on the beach?

We found this on a beach in North Devon, UK. I've never seen anything like it. There's a yellowy-ball in the middle with 5 pointed shells attached to it, each of which seems to have a single "leg&...
2
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0answers
28 views

What coastal creature leaves braid-like trace that has clear landing and take off points?

6/29 around 8 PM EST (within 40 minutes after downpour) the depicted trace was found in swash zone at Jacob Riis Park in NY. For reference the boot size is 12.
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Does the coast of California support a larger population of marine mammals than Maine?

Visiting the Maine and California coasts, I've noticed that it is much more common to see marine mammals from the coast in California, including seals, dolphins, and whales. I've been hypothesizing ...
5
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1answer
6k views

Do all sea creatures that have scales have to have fins?

Do all sea creatures that have scales have to have fins? Do we know of any sea creatures that have only scales without fins? I'm especially interested in fish that have scales but no fins.
3
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1answer
143 views

What is the name of this sea creature?

I found this creature on the beach in San Diego. It is 8cm long and the end to the right is the mouth. The underside is exactly the same as what is visible. What is the name of this species.
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0answers
90 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 ...
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0answers
28 views

What species is this marine invertebrate sighted 2m below the surface near Halifax, NS?

This image was taken at ~2m depth, with a small ROV in Halifax, NS in May. We're in the Northwest Atlantic Ocean and as far as I know, don't have gooseneck barnacles. Considering that it may be a ...
6
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4answers
818 views

Were there any marine/aquatic dinosaurs?

Most dinosaurs were terrestrial, but there were a couple of groups of arboreal and flying dinosaurs (microraptors, birds etc). I have read that the theory that Brachiosaurids were aquatic has been ...
30
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1answer
1k 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....
24
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2answers
4k 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 ...
1
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1answer
103 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 ...
2
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1answer
74 views

help identifying marine item found on beach

Need help identifying this hard waxy egg like item found on beach in Destin, FL (USA). It feels waxy and semi hard. Also smells like squid or real fishy. it is also semi transparent with dark tan ...
9
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1answer
151 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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0answers
84 views

Has a walrus ever been filmed catching a seal under water?

Walruses have been long thought to be grazing feeders, scooping up clams from the sea floor. However, when walruses bodies have been examined by scientists, frequently the remains of seals are found ...
34
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2answers
105k 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 ...
0
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1answer
82 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" ...
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0answers
19 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 ...
3
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0answers
25 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 ...
3
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1answer
61 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
65 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
40 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
99 views

Anyone know what this it?

More than 1 washed up on a beach in Ireland..close to some big jellyfish