Questions tagged [marine-biology]

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

Filter by
Sorted by
Tagged with
5
votes
0answers
34 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.
0
votes
0answers
32 views

Is this a living organism?

Is this thing a flower or marine plant?
5
votes
0answers
32 views

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 ...
1
vote
0answers
28 views

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 ...
0
votes
0answers
15 views

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 ...
2
votes
1answer
46 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 ...
-1
votes
1answer
66 views

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 )
1
vote
1answer
30 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 ...
1
vote
0answers
38 views

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'...
1
vote
0answers
26 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 ...
6
votes
1answer
99 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 ...
24
votes
2answers
3k 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
vote
1answer
97 views

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.
10
votes
1answer
87 views

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 (...
17
votes
3answers
277 views

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?
0
votes
1answer
55 views

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 ...
3
votes
1answer
76 views

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.
8
votes
0answers
145 views

What is this underwater creature?

West Bali, about 10 meters deep. Body is roughly 10 cm across. Does not move.
3
votes
1answer
94 views

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.
1
vote
0answers
62 views

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 ...
1
vote
0answers
51 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) ...
3
votes
3answers
664 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 ...
2
votes
0answers
39 views

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 ...
0
votes
1answer
26 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 ...
1
vote
0answers
25 views

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? ...
12
votes
1answer
317 views

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 ...
3
votes
0answers
77 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 ...
10
votes
3answers
3k views

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 ...
2
votes
1answer
46 views

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 ...
4
votes
1answer
76 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 ...
2
votes
0answers
63 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 ...
3
votes
1answer
131 views

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 ...
4
votes
2answers
80 views

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.
5
votes
0answers
89 views

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 ...
2
votes
1answer
1k views

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?
5
votes
1answer
828 views

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/...
-3
votes
1answer
114 views

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?
4
votes
1answer
219 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 ...
5
votes
0answers
182 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.
6
votes
1answer
331 views

What is this strange horned, slug-like coral reef dwelling creature?

On the first episode of BBC's Blue Planet II they visited a coral reef and showed some odd reef-dwelling creatures as part of their establishing shots, but they did not identify the creatures. What ...
2
votes
1answer
100 views

What is this strange mantis-like coral reef dwelling creature?

On the first episode of BBC's Blue Planet II they visited a coral reef and showed some odd reef-dwelling creatures as part of their establishing shots, but did not name the creatures. In particular ...
0
votes
1answer
178 views

Identify this tuber like object found on beach

Can anyone identify this tuber-like object I found on a beach in South Wales, UK? It's about 25 cm long and looks like a deflated football. Pretty spongy, saturated with water. I was hoping it was ...
3
votes
0answers
45 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 ...
1
vote
0answers
60 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 ...
1
vote
0answers
137 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 ...
1
vote
0answers
39 views

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 ...
19
votes
4answers
603 views

What sea animal is this?

I am in a remote village and a young boy (second pic holding tail) says this thing is his friend. This creature is safe, we held it for pictures and released it after. None of us know what this is and ...
2
votes
1answer
128 views

Why do sea mammals die on land, and drown on sea?

It's quite confusing to me, why do sea mammals die on land, but also die from drowning if they couldn't reach the sea surface to breath? Excuse my ignorance but I am really confused!
3
votes
1answer
1k views

Rock cod vs grouper

What is the difference between a rock cod and a grouper? The only difference I notice is that grouper seems to be bigger in size. But other than that, they are very similar.
1
vote
1answer
282 views

What sounds deter sharks?

Have any studies been done to find sounds that alienate sharks?