Questions tagged [marine-biology]

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

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210 views

What is this underwater creature?

West Bali, about 10 meters deep. Body is roughly 10 cm across. Does not move.
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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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is this a soft coral on sand?

Was diving a few days ago at Jervis Bay (Australian East Coast - temperate). Water temp 20 degrees C, depth 5m. Spotted this creature in the sand. About 150mm high. It isn't sea-pen (Cnidarian) as it ...
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What is this sea shell?

Found in Belgrade, possibly carried back from the Mediterranean or Aegean coast.
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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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210 views

Please identify this creature found on the beach

Found on beach in Atlantic Canada in November. "Sack" is approx. 2" (approx. 5cm) in length.
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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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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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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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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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102 views

Which scallops change their sex from male to female?

Tonight it occurred to me to look up what scallops are like when they are alive (beyond their culinary role) and it blew my mind. This post regards one detail about which I was unable to find specific ...
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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 ...
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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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How do marine mammals and penguins maintain bone density?

After much searching on Google with no results, I decided to ask my question here. If I'm not mistaken, swimmers' bone density is less than normal; at least for lifetime swimmers. Astronauts also ...
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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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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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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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seafood muscles - how do they work?

Today, first time in my life I ate seafood. It was a squid and a calamar. Note that I am biology layman, so please be merciful :( While dissecting my food I noticed that the tissues of those ...
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69 views

What is this whitish jelly incrustation on a plastic tube?

I found this plastic tube hanging in the seawater from a pier in the haven of Taranto, Ionian sea, southern Italy. I'm wondering what is the whitish jelly in the lowest part of the photo next to the ...
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Why do most fish move fins orthogonally with their axis of symmetry?

So recently I read the question why are most fishes vertical (in the sense of distribution of their body mass) and it got me thinking what is the reason behind the direction they move their fins. My ...
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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 ...
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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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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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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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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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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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42 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 ...
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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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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'...
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29 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 ...
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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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53 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) ...
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171 views

How do marine mammals stay hydrated?

This is a question that has always bothered me. A quick internet search yields "metabolic processes" as the reason for how marine mammals obtain water, but what are those processes and why don't land ...
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Does overfishing in one ocean hurt fishstock in another?

If there's overfishing in the Atlantic or North Sea - will this affect fish stocks in the Indian ocean? Are there papers on this? The question I'm trying to answer is whether overfishing by developed ...
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267 views

Calcium carbonate minerals in marine organisms shells

Calcium carbonate minerals exist in seawater in two main phases: calcite and aragonite. While calcite is the most stable phase, it is aragonite that precipitates first in seawater because of the high ...
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Can the calcification response of a marine organisms, at different pH conditions, be assessed by the calcium magnesium ratio?

Can the calcification response of a marine organisms, at different pH conditions, be assessed by the calcium magnesium ratio? the calcium magnesium ratio is a proxy of calcification?
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Why are brightly coloured marine animals thought not to display aposematism?

There are many brightly coloured marine animals, such as fish, corals, sea stars, and octopodes. And yet Wikipaedia says it is thought that those colours don't serve to deter predators, while they do ...
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307 views

What do sharks not like the smell of?

I was reading about the sharks strong sense of smell ( Shark senses - @EnhancedLearning.com ) and wondered if any research has been done into what they don't like the smell of? Is there any material ...
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Can immortality of the Turritopsis dohrnii be learned or adapted by other species?

I have heard that Turritopsis dohrnii is a species of jelly fish which is immortal, as it can grow old and then back to growing young. So, how is it possible? Can other species (marine and/or land) ...
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Where should one start if they want to go about identifying phytoplankton and dinoflagellates?

I'm a first year university student and I really need help on how to identify and recognize the different organisms observed in my water samples. Are there any good references/tips on how to?
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Neuston vs pleuston

I was recently reading about the wonderful chondrophores, and came across the terms "neuston" and "pleuston". According to Wikipedia, "neuston" are "the organisms that float on the top of water ... ...
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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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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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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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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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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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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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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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54 views

Is there a cellular physiological response to desiccation in animals?

There has been much research on the molecular effects of high levels of temperature for animals, specifically regarding heat shock proteins, protein denaturing and energy investment into stress ...
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494 views

Can certain jellyfish photosynthesize in the medusa stage?

Can jellyfish (at least some of them) do photosynthesis in the symbiosis with zooxanthellae in their medusa form as well? I've heard that only Cassiopea andromeda can but I wasn't able to find a ...