Questions tagged [marine-biology]

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

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14 views

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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1answer
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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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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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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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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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1answer
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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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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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2answers
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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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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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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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1answer
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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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1answer
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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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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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1answer
79 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 ...
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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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1answer
42 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 ...
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1answer
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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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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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297 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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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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1answer
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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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1answer
136 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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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
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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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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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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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1answer
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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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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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1answer
150 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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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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1answer
134 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 ...
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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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1answer
98 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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1answer
95 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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1answer
176 views

What is this sea shell?

Found in Belgrade, possibly carried back from the Mediterranean or Aegean coast.
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1answer
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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 ...
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1answer
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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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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 ...
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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 ...
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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 ...
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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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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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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 ...
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1answer
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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?
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1answer
153 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 ...
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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 ...
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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 ...
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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 ...
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1answer
140 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 ...