Questions tagged [marine-biology]

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

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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 ...
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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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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 ...
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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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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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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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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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Is this a living organism?

Is this thing a flower or marine plant?
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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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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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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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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 ...
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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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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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257 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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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 ...
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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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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 (...
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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?
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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 ...
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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.
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What is this underwater creature?

West Bali, about 10 meters deep. Body is roughly 10 cm across. Does not move.
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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.
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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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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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Anyone know what this it?

More than 1 washed up on a beach in Ireland..close to some big jellyfish
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687 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 ...
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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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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 ...
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How do plastic containers and other thrash end up in the ocean [closed]

There are many photos of the ocean, which in some parts is littered with all sorts of waste, often plastic bags, containers etc. But I just wonder - how do such large amounts land in the ocean/sea? ...
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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 ...
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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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Inexperienced divers damage coral, but parrot fish eating coral doesn't do damage?

I've been learning about life on coral reefs. Recently I've become aware of the damage to coral reefs caused by tourism and inexperienced divers: 1) Corals have a thin membrane which keeps them ...
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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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79 views

Octopus behaviour

When visiting a museum in Malmo my friends and I came across this little guy. While we observed him wandering around his tank he suddenly opened a channel on the side of his head and shot some red ...
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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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How did shellfish and coral survive acidic oceans in earlier eras?

Throughout most of Earth's history, the planet has had more CO2 in its atmosphere, correct? Therefore th pH of the oceans was even lower, right? So how did CaCO3-using animals create their shells ...
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I found this on the beach at Breamlea in Vic Australia and wondered if you could tell me what it is please

It is about 6.5 x 5 centimetres and semi transparent. It has quite a tough skin and is hollow inside. Like a tight clear tooth shaped balloon. I have put a coin next to it for you to see the size.
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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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Why are there no fresh water osmoconformers?

I'm just having trouble understanding this. I know that often marine fish are osmoconformers, and freshwater (like bony fish) are often osmoregulators, but why?
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Is the Opah a warm blooded fish?

In 2015 many sources, including USA TODAY, Discover Magazine, and National Geographic, ran stories about the Opah fish (Lampris guttatus) being warm blooded. Image Source: http://discovermagazine.com/...
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why can't humans live underwater like seals or whales? [closed]

I was wondering, why can't humans live under water like whales or seals? If whales can live underwater, and they're mammals, why can't we?
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224 views

Are freshwater jellyfishes really jellyfishes?

Articles from the aquaticcommunity.com and the Nature Conservancy suggest that freshwater jellyfish, Craspedacusta sowerbyi, are more closely related to the Genus Hydra. From the Nature Conservancy ...
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Please identify this creature found on the beach

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