Questions tagged [ichthyology]

Questions relating to the study of fish or icthyology.

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5
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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.
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53 views

What type of fish is this

I saw this fish in an aquarium in a nearby house .I am not sure which species and sex this fish belongs to. [![enter image description here][1]][1] [1]: https://i.stack.imgur.com/oOAZx.jpg
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Can fish grow too fast?

Fish will grow faster under higher temperature, assuming enough food is provided. But can they grow too fast that it would be damaging to their long-term fitness?
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2answers
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Never caught this fish before

After catching a bunch of mangrove snapper using live shrimp, my son caught this fish in about a foot of brackish saltwater water off a dock near a rock wall in Vero Beach at around 10:00 AM on July ...
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1answer
37 views

What kind bottom feeder is this?

It’s about 2 1/2 inches long and had a little tail on the end. Also has short feelers that almost look like a moles.
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4answers
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Can a person survive on blood in place of water?

This question: Can you get enough water by eating only fish? asks if a person could survive on fish alone. Can a person survive on fish and/ or blood alone of any species if stuck at sea or animal ...
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1answer
19 views

Formula for Oxygen Consumption for Atlantic Salmon (Mathematical) - insecurities regarding variable

The oxygen is calculated in mg per kg per something, so what does $h^{-1}$ stand for? hours maybe? The formula given below is an estimation of oxygen consumption for Atlantic salmon \begin{...
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1answer
40 views

Does the yolk sac for Danio rerio form at the vegetal pole?

Does the yolk sac in general form always at the vegetal pole? If so, is this the case for Danio rerio (the zebrafish)?
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16 views

What kind of Porcupinefish is this?

The fish on this picture has a body length of about 10cm. Is it a Slender-spined porcupine fish? I've searched Slender-spined porcupine fishes on wiki and youtube, and found that the shapes of ...
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1answer
145 views

What the name of this fish?

Well saw this on a fish group on facebook. Noone can give a decent answer so I came to you guys hoping you can help us? The one who posted lives in the Philippines and he said he caught it in the ...
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18 views

Can fish hear ultrasonic frequencies?

I have a team that's working on using ultrasonic waves to measure the volume of water in a fish tank. We have both gourami and tilapia in the tank, and wanted to make sure that they wouldn't hear the ...
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44 views

Does anyone know what kind of fish this is?

My dad caught this little fish, but it is too small for us to know what it is. We live in New South Wales, Australia so it has to be a fish native to here -- does anyone know?
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1answer
41 views

what is the name of this fish?

]2 fishes are of length 2 to 3 inches.
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2answers
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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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1answer
832 views

What sort of fish is this?

Just saw a meme online with this fish on it. Is this a real fish? Can some aquatic expert identify this for us?
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1answer
56 views

Is the deep ocean fish look ugly because due to darkness there is no visual sexual selection? [closed]

Is the deep ocean fish look ugly because due to darkness there is no visual sexual selection? If so, is there a common notion of beauty between humans and animals?
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53 views

Did the Broadbill Swordfish population fully recovered?

Regarding the Broadbill Swordfish Xiphias gladius: I read Richard Ellis "Swordfish: A Biography of the Ocean Gladiator", Chicago University Press, 2013. The chapter about industrial-strength fishing ...
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1answer
67 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 ...
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51 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 ...
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1answer
48 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!
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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 ...
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30 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 ...
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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.
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1answer
158 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.
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1answer
73 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 ...
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1answer
147 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?
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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 ...
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2answers
70 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....
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1answer
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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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1answer
96 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 ...
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40 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?
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1answer
54 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 ...
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1answer
72 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 ...
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1answer
71 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 ...
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45 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?
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1answer
109 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?
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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 ...
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1answer
119 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 ...
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1answer
3k 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
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1answer
80 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 ...
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1answer
187 views

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

This is a screenshot from a youtube video that you can watch here: https://www.youtube.com/watch?v=zcdJNPYkIE0
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1answer
85 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 ...
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2answers
134 views

Any idea what this fish is?

Bought this Fish at the pet shop today. Forgot it's name. That pink fish
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1answer
39 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.
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1answer
147 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 ...
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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.
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1answer
438 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.
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2answers
273 views

How do fishes “breathe” while eating?

First of all, a fish opens its mouth and water enters which passes through its gills. This helps in oxygenating its blood. So, if any food particle is in its mouth, how can it "breathe" i.e. how does ...
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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 ...
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1answer
190 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 ...