Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [ichthyology]

Questions relating to the study of fish or icthyology.

0
votes
1answer
27 views

What ecological niche do disk shaped fish exploit?

I looked up "Early Triassic" to get a sense of what that meant and I ended up on this image of marine life at the time. I noticed some disk shaped fish (#8 in the picture: Bobasatrania (durophagous ...
0
votes
0answers
26 views

Could fish safely “breathe” pure oxygen in their water?

I've heard it said various times before that humans can't breathe pure oxygen, or at least not for very long, before it would kill us. But during a discussion on Worldbuilding, the difference between ...
4
votes
1answer
44 views

anyone can help identify this aquatic microganisms?

I extracted from fish excretion and at 400x At the moment i have yet to try any medication because i don’t know what this is. Can someone who has seen this before share the light? thanks!
0
votes
1answer
34 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 ...
1
vote
0answers
25 views

Who cleans the cleaner fish?

Cleaner fish are those fish that eat the dead skin cells and parasites off from other usually larger fish. ( such cleaners include wrasse, cichlids, catfish, shrimp etc ) I wondered if the cleaner ...
3
votes
1answer
57 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.
2
votes
1answer
76 views

What kind of fish is on the picture?

I saw these fish in a video at an art exhibition, I'd like to find out what kind they are.
2
votes
1answer
51 views

Cichlid fish in Africa

Are the cichlid fish in Africa an example of divergent or convergent evolution? On the one hand they have evolved similar features to each other indicating convergent evolution, but on the other, they ...
1
vote
1answer
112 views

Why don't fish get hurt with so many sharp fish bones?

Why don't fish get hurt with so many sharp fish bones? And why don't fish feel pain when they swim? Don't those sharp fish bones stick into the flesh while swimming?
4
votes
0answers
60 views

Devonian Fish Diversity--What Would it Have Looked Like?

For 70 million years, the oceans, lakes and rivers of the world teemed with seven groups of fish: Placodermi Acanthodii Agnatha Chondrichthyes Sarcopterygii Actinopterygii Now two of those ...
1
vote
2answers
67 views

What is the animal in this video?

I made some research however there seems to be a conflict with this animal's translation to my language and the original. So I couldn't find it. Do you mind helping me out ? https://static.59saniye....
0
votes
0answers
18 views

Why don't all the bass get eaten by bluefish? [duplicate]

In New England where I live two of the most commonly found sport fish are bluefish and striped bass. The bluefish are like piranhas on steroids. They have razor sharp teeth and can grow to be quite ...
0
votes
0answers
25 views

Are there scales on fish heads? [duplicate]

Fish heads don't usually appear to have little scales, like on the body; but I find no mention in even Google Scholar about fish Not having scales on their heads. I'm guessing there are scale-like ...
0
votes
0answers
49 views

What is this? They appear in the tank overnight

Can anyone identify these?They appear in the tank overnight and I don't know where they are coming from. I have I have Danios, a tetra, a balloon molly, a bamboo shrimp, a Betta and I did have a ...
0
votes
1answer
57 views

What are the small lumps in the mouth of the fish, and what is its function?

Today I was performing a fish head dissection to investigate the gas exchange process in biology. Then when I opened the mouth I noticed these small hard structures at the base, I assume they may be a ...
1
vote
0answers
35 views

how origin of koi carp is different from goldfish

where did koi-carp originate? how are they different from goldfish? Wikipedia say that goldfish originated by genetic mutation but what about koi-carps?
1
vote
1answer
41 views

Any good fish books out there?

I recently read "What a Fish Knows: The Inner Lives of Our Underwater Cousins" by Jonathan Balcombe. The first part was the best where the author explained how fish are very advanced creatures because ...
3
votes
1answer
60 views

Saltwater fish identification

Can someone please identify this fish. Someone had asked me to rehome this fish but they were unsure what type of fish it is. Right now I have it in a quarantine tank until I find out what type of ...
0
votes
1answer
65 views

Wondering if a Ichthyologist can identify this fish for me

This will be very simple for a lot of you! But I been getting mixed answers about his catch. Is this a chinook salmon or brown spotted trout? Caught in Angus, Ontario, Canada. (Hwy 90 Bridge) I ...
1
vote
0answers
43 views

A fish with 3 paired fins

Many species of fish have 2 or 4 fins combined into pairs. But is there a fish with 3 (or even more) paired fins? Or has it ever existed in the past?
1
vote
1answer
76 views

If an organism is supported only by cartilage, does it have an endoskeleton?

Lamprey and sharks lack bones, but does this mean they are not classified as having an endoskelton? Does an organism need bone to be considered as having an endoskeleton?
1
vote
0answers
28 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 ...
0
votes
1answer
97 views

What type of jellyfish is this?

Friends of mine recently came back from a visit in kenya and on the kenyan beach they said they found several jellyfish with "sails" on their head. We tried finding out what they were and found one ...
6
votes
1answer
2k views

What happens to deep sea creatures if they reach the surface?

Since deep sea creatures are adapted to incredibly high pressures, I would assume they would not be able to survive in the low pressure environment of the surface. What exactly happens ...
2
votes
1answer
78 views

Which fish species is it?

Today we found this kind of fish on the shore of Baltic Sea near Gdansk (PL). It is a very thin "fish" with some kind of a needle in place of nose. It was about 5 cm long and very lively. What is the ...
3
votes
1answer
138 views

What type of fish is this and why is it so huge?

This is a screenshot from a youtube video that you can watch here: https://www.youtube.com/watch?v=zcdJNPYkIE0
0
votes
1answer
71 views

Do Cooper Hawks eat fish?

I have seen a Cooper hawk sitting on a low branch above my small Koi pond 3 times in 4 months. The books and net say they eat birds and some mammals but I wonder if he is looking at my fish ? Or ...
3
votes
2answers
118 views

Any idea what this fish is?

Bought this Fish at the pet shop today. Forgot it's name. That pink fish
0
votes
1answer
38 views

What are the differences between Trachinotus and Bramidae species?

What are the differences between Trachinotus(Pompanos) and Bramidae(Pomfrets) ? ...like the difference between where they live/can be found, bone structure, etc.
6
votes
1answer
131 views

How do fish maintain razor sharp teeth?

I was watching a program about Barracuda - they have a front tooth that is supposed to be razor sharp. My kitchen knife goes blunt if I use it for long periods without sharpening. Sharks keep on ...
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.
4
votes
1answer
295 views

What kind of fish is this (Florida, USA)?

What kind of fish is this? It was caught in Florida (USA) in a canal and was in a group. It was about 5 or 6 inches in size.
6
votes
1answer
2k 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
votes
1answer
172 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 ...
0
votes
2answers
145 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 ...
0
votes
1answer
78 views

Part of a fish outside the intestinal sac on the back?

I saw an expert Japanese chef fillet a mackerel (Scomber scombrus). He cut off the head and the whole intestinal sac came out with it as a single unit. Then he took the knife and scraped something ...
2
votes
1answer
259 views

Why do herring have fine bones

Most fish have largish bones which support the core muscles. Around the abdomen, they act as a sort of framework protecting the organs. With herring, the bones are really fine: almost thread like ...
2
votes
2answers
235 views

ID Fish from Florida?

This fish was caught in St. Augustine, Florida. What species is it?
2
votes
1answer
163 views

Trying To Identify this Fish

My 4 year old fell in love with this fish at the aquarium. I'm trying to find out what species it is so we can learn more about it.
7
votes
1answer
2k views

For fish, does a bony skeleton have any advantages over a cartilage skeleton?

I have learned that two important lineages of fish are the bony fishes (Osteichthyes) and the cartilaginous fishes (Chondrichthyes). Many websites mention an advantage of the cartilaginous skeletons ...
6
votes
2answers
3k views

What is the difference between the evolution of fins in whales and fish?

For a homework assignment I received the following question: Which statement best explains the evolution of fins in whales and fish? a. The common ancestor of whales and fish possessed genes for ...
0
votes
2answers
150 views

Why is living on land beneficial?

When fish started developing the stronger limbs needed to walk(Slither?) onto land how was this beneficial? I cannot think of any form of food that would be helpful that would not be plentiful in ...
3
votes
1answer
175 views

What kind of fish is this? Spotted or largemouth?

I don't know if this is a weird looking largemouth bass or a spotted bass. It was caught in southern Oklahoma. Please help! Thanks.
8
votes
1answer
447 views

Worm found inside of wahoo

A fisherman from Hawaii wrote the following: This Fat juicy worm lives inside of every Wahoo that I catch. Inside the stomach. Right at the junction to the intestines. Sometimes there are two. ...
1
vote
1answer
191 views

What kind of fish is this? I don't remember the full name but it started with Tiger

name starts with tiger, forgot the rest, please help
2
votes
0answers
80 views

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 ...
7
votes
1answer
147 views

Evolution of Upside Down Catfish (Synodontis nigriventris)

My Biology teacher asked us to write 3 texts, explaining the evolution of the Upside Down Catfish Synodontis nigriventris, each one according to Lamarckism, Darwinism and Neodawrinism theories. She ...
1
vote
1answer
125 views

Do Osteichthyes fishes have any cartilage?

Higher vertebrates, such as mammals, birds, reptiles and amphibians have both bone and cartilage. But do Osteichthyes fish (Bony fish) have any cartilage? Or do they only have bones? I've searched ...
7
votes
2answers
478 views

Why are most fishes vertical?

Why do most fishes have a "vertical" body shape instead of a "flat" one ? Here "vertical" means that the body(from a front view) is roughly orthogonal to the horizontal plane, and a "flat" body shape ...
5
votes
1answer
732 views

What kind of fish is this, caught in Cape Coral, Florida?

What kind of fish is this? It was caught in the canal in Cape Coral, Florida. The canals are clean brackish water — a mix of saltwater from the Gulf of Mexico and freshwater from the Caloosahatchee ...