Questions tagged [ichthyology]
Questions relating to the study of fish or icthyology.
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What kinds of fish tend to have a shorter death after being caught? [duplicate]
I have reworked this question in order to get a full scienfic background.
For example here I have read that prawns die after a couple of minutes out of water.
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What kinds of fish tend to have a rapid death after being caught?
I am asking this question because I am trying to make my diet less cruelty-oriented, for this reason this question can be related to trolley problem since I am coping with an ethical problem trying to ...
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Is it humane to kill fish by immersing them in very cold water or ice slurry?
I'm doing some research and advocacy for the humane treatment of wild-caught fish. Humane standards are more common on fish farms than at sea, so I am trying to identify some reasonable standards for ...
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What strains of algae do freshwater fish, snails, and shrimp prefer?
After a deep clean, my aquarium is algae free for the moment. This is a problem for my algaephage fish, snails (mystery and especially nerites who apparently can't eat wafers), and amano and cherry ...
3
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1answer
36 views
Is there an adhesive that could used for larval fish?
I am currently working on an experimental design that requires a larval fish (~ 4mm long) to be affixed on a metal wire tip on its dorsal side. Now, I was thinking of a glue or adhesive to do the job, ...
3
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1answer
27 views
Which fishes produce alarm signals to warn other group members about in coming predators
Atlantic Goliath Groupers are fishes which produce unique low frequency sounds to mate and when approached by predatory fish . The sounds produced when approached by a predator (or even a scuba diver) ...
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26 views
What type of guppy is this?
This is a guppy I recently bought from a local pet shop. They don't exactly know which type of guppy it is. I hope to get info about it's type.
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41 views
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 ...
9
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1answer
139 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.
I have also made an attempt to find ...
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63 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?
7
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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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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 ...
3
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1answer
25 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{...
2
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1answer
43 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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0answers
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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 ...
2
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1answer
149 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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27 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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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
43 views
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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 ...
8
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1answer
876 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?
3
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1answer
62 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?
2
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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
73 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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68 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
49 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!
2
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1answer
80 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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32 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
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1answer
94 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
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1answer
185 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
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1answer
79 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
184 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
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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
32 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
...
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1answer
134 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
63 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 ...
2
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1answer
78 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
83 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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0answers
48 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
119 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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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
143 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
81 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
197 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
95 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 ...
