Questions tagged [marine-biology]

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

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What is this marine creature? Is this a fossil?

Found this on a beach on the East coast of India - Vishakhapatnam, India Is this a fossil? A coral? Its small enough to fit in my hand These tunnel-like structures are hard like rock/calcified ...
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Can whales send each other [3D] images?

Russell Arnott, apparently an oceanographer, who currently works as a project manager at the Sainsbury Laboratory, Cambridge University (UK), wrote in his piece Whales and Waves (2016, p.2): New ...
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What unmanned monitoring techniques are available to measure coral reef health?

Most biological data for coral reef monitoring are collected by human observers. This could be resource-intensive for long-term studies and thus hard to maintain consistency on large spatial scale. ...
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7 votes
1 answer
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Why does biomagnification of mercury occur more in large fish?

I love tuna so this question has been bugging me senselessly. I am aware that larger fish tend to have more mercury concentration in their flesh than their prey, however, I don't understand how this ...
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1 answer
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What types of sounds do sperm whales produce?

Sperm whales produce echolocation clicks, what are the other types of clicks and other sounds they can produce?
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How can this coral survive with little sunlight?

Forgive me if this question is off topic, but I’ve seen similar questions so I think it should be on topic. I’m at the beach currently, and I was looking in tide pools for interesting things. I found ...
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Which varieties of Aurelia aurita do not have a polyp phase?

According to this "In some Aurelia aurita, the polyp stage does not exist.", but they don't cite anything. Is there a resource detailing life cycles of various jellyfish or do I have to find ...
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What did dying reefs look like during the Permian?

Today, reefs are made by scleractinian corals. They rely on a symbiotic relationship with unicellular photosynthetic organisms (zooxanthellae) in order to grow as fast as they do. This relationship ...
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Why do blobfish become bloated when they are brought to the surface?

There are several things that can happen to deep sea creatures that are brought up to the surface, but none of them explain why the blobfish becomes deformed. Blobfish don't have swim bladders, so ...
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What is this large, lively barnacle?

Yesterday I found this creature in a rocky cove in central California, around mid tide (+ 3 feet). It's about 3-4 inches long. At first I thought it was dead, but it closed its mouth when I removed ...
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Cortisol in sharks

Is there an established method for measuring stress hormone levels, like cortisal, in sharks? If so, is it known what levels of such hormones create significant detrimental effects like decreased ...
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What are marine fungi like?

Particularly, what is their mycelium like and where exactly do they grow it? I imagine that their spores travel though water same as terrestrial fungi travel through air until they stumble upon solid ...
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What protein(s) bind together the calcium carbonate tiles in abalone shell to give it strength?

The articles that I've been able to find on the structure of abalone shells mention that they consist of calcium carbonate plates connected by proteins, but don't name the proteins. These proteins are ...
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Please, help identify this sea worm

It was found in Malta, in a puddle by the sea. It left a lot of tiny hair on the shoes (which we removed thoroughly without touching them). I didn’t have any coins with me so I put keys for scale.
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Why do fish and marine mammals need special low density adaptations for buoyancy?

When one reads about fish and marine mammals, it is always said that for example blubber of marine mammals helps them with buoyancy because it is so low density and similarly for example sharks have ...
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7 votes
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Deflated bag-like species on beach: Identification

I encountered this on a beach in Chandipur, along the Bay of Bengal in India. Quite a few of them were scattered in different locations. Identification of this controversial object is appreciated.
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4 votes
1 answer
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What are the current theories on how baleen whales make whale song?

Wikipedia does not provide many details1 on how baleen whales produce 'whale song', saying it's still a mystery. The linked Gizmodo article provides these paragraphs: Humpback whales, for example, do ...
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1 vote
1 answer
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does more biomass mean more energy?

I am a high school student and I am very confused about ecological pyramids. My textbook states that the biomass of zooplankton in an aquatic ecosystem is more than that of phytoplankton (I don't know ...
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3 votes
1 answer
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Can anyone identify this fish?

I saw it in the sea very close to the beach in front of Starfish Hotel in St Lucia. It had some spines along its back and it seemingly had fins on each side that split open into 4. It used its front ...
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2 votes
0 answers
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Can Shark bodies be preserved?

Under Normal Conditions, Shark bodies, which are made of cartilage are not preserved and only the teeth can only be preserved, I searched up, if Shark Bodies can be preserved in ice and I got this CNN ...
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1 answer
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Could you identify the species of this animal attaching to a fish in the Aegean Sea?

While wading within a few meters from the shoreline today, I observed and was observed by a number of curious fish. One of them had a blackish attachment, which was reminiscent of a small aquarium ...
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1 vote
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Why is this Sea Turtle yawning?

I found this video online of a Green Sea Turtle lying down on a sea sponge and letting out a big yawn. Here is a screenshot of the video, just incase the link doesn't work: As far as I understand, ...
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Could the problem of overfishing be solved by throwing fertilized fish eggs at the right place and deepness into the sea? [closed]

I hear sometimes about over fishing and I wonder if the following idea could help to solve the problem. My idea is to throw fertilized fish eggs at the right place and deepness into the sea. These ...
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3 votes
0 answers
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Octopus out of water

I was watching a YouTube video where a guy saw an octopus out of water. It was far from a puddle, and looked like it was struggling. He decided to help it get to the next puddle, so he picked it up ...
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1 vote
1 answer
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Have orcas ever been observed to be eaten by another species?

Orcas are well known to prey on just about everything that lives in the ocean, even including great white sharks. Yet in a lot of cases I know that the food chain is not unidirectional, there are many ...
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6 votes
1 answer
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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 ...
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2 votes
1 answer
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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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3 votes
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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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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 ...
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1 vote
1 answer
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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 ...
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1 vote
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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 ...
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-1 votes
1 answer
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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 ...
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2 answers
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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, ...
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4 votes
2 answers
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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 ...
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2 votes
2 answers
351 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 ...
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1 vote
0 answers
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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.
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1 vote
1 answer
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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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-4 votes
1 answer
151 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 ...
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0 answers
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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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1 vote
1 answer
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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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2 votes
0 answers
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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 ...
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4 votes
1 answer
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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 ...
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28 votes
1 answer
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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&...
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1 vote
0 answers
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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 ...
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3 votes
1 answer
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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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2 votes
0 answers
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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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5 votes
1 answer
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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 ...
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1 vote
0 answers
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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 ...
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4 votes
1 answer
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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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2 votes
1 answer
112 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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