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Questions tagged [marine-biology]

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

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Trying to find a species that I don't know

A long time ago I went to an aquarium with my family. there was a fish that looked like a manta that swam up against the glass for a while. A part of it opened up and there was a large eyeball inside. ...
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0answers
32 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 (...
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3answers
208 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?
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1answer
26 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 ...
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10 views

Telling Sacoglossa and Nudibranches Apart

For a bit of background, I have never seriously studied marine biology and my lacking understanding comes from randomly googling and reading wikipedia. I'm very interested in nudibranches and have ...
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1answer
53 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.
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What is this underwater creature?

West Bali, about 10 meters deep. Body is roughly 10 cm across. Does not move.
3
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1answer
81 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.
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0answers
45 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 ...
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0answers
30 views

What species of fish is this?

I have a horrible memory, and I forgot what species he was soon after I bought him. I've had him for almost six months, and he's just so neat looking that I want to know more about him.
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0answers
36 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
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3answers
399 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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0answers
34 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 ...
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0answers
23 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
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1answer
135 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
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0answers
49 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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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
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1answer
44 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
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1answer
64 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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0answers
57 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 ...
4
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1answer
85 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 ...
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0answers
101 views

identify an unknown crustacean found in Vietnam

Could someone please let me know the name of this crustacean? This species was found in Vietnam. Much appreciated
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2answers
72 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.
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0answers
69 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
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1answer
606 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?
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34 views

Why does the colour of the Earth‘s oceans vary?

Why does the colour of the Earth‘s oceans vary? Coast lines around the world appear to have different shades of blue. The further one travels from the equator north or south the deep blue the ocean ...
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1answer
497 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/...
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1answer
80 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
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1answer
107 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
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0answers
143 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.
7
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1answer
240 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
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1answer
90 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
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1answer
135 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 ...
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0answers
34 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 ...
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0answers
37 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 ...
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0answers
94 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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0answers
22 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
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4answers
507 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
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1answer
116 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
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1answer
880 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.
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1answer
172 views

What sounds deter sharks?

Have any studies been done to find sounds that alienate sharks?
4
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1answer
116 views

Function of the spermaceti organ

What is the use of the spermaceti organ of the sperm whale? One possible theory considered is that it was used for floating and going underwater by heating/cooling the oil. However, it is a lot ...
6
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1answer
1k views

What percentage of fish are herbivorous vs. carnivorous?

It appears that the majority of fish we eat are carnivorous, such as salmon and tuna. This got me wondering how common herbivores and carnivores are among fish species. I couldn't find an answer to ...
7
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1answer
158 views

Help identify these (two) fishes - Netherlands

Yesterday my kids caught these two fish. I tried to figure out what kind of fish (species and name, to tell my kids a bit more about them) they are but I was not successful. Today we made a trip to a ...
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0answers
40 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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2answers
134 views

Are lanternfish real?

Is there a real lantern fish existing in the world? If yes, kindly share a picture if one exists. I searched online for images, but most of them seem to be fake. The pictures I have seen on the ...
7
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1answer
68 views

Where can I find comprehensive data on animal distribution?

I'm looking for vertical distribution or tidal height of several intertidal species, specifically from the Pacific Northwest. I considered looking for published research for each species however, my ...
8
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2answers
181 views

ID a marine creature found on a beach on the US east Coast

While walking on a marshy beach, I found this creature. It has no eyes, no feet, no fin, no gills. The only thing I know is that the skin lightly contracts. I found at least three of these. It is ...
8
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1answer
364 views

ID a shell from Puerto Rico

I recently found this in Rincon Puerto Rico on the beach. I assumed it was a baby sea turtle shell or some kind of turtle. Someone that frequents Puerto Rico said it was not. Does anybody know what ...
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1answer
127 views

Organic battery?

Similar to the Matrix movie where humans were used as a source of electricity but different by using electric eels. Farmed like tuna what would be the electricity exchange to the food they eat?