Questions relating to the study of fish or icthyology.
Questions tagged [ichthyology]
178 questions
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1 answer
Why is clownfish attracted to actinia?
I heard that Actinia Equina normally eats what it can catch, but this clownfish here doesn't care much about that:
https://www.youtube.com/watch?v=Ughm4mnZ1ls
Since the actinia obviously can't hold the clownfish, clownfish does whatever it wants…
user1306322
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Why are fish constantly in motion?
When I see fish in an aquarium, they never seem to stop swimming. This is in contrast to e.g. the penguins, who spend a lot more time just standing there.
Is this true in the wild or specific to aquariums for some reason? Is there a biological or…
Eli Rose
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4
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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!
Lim Tuang Teck
4
votes
2 answers
How does a stonefish get oxygen out of water?
It is said that the stonefish (Synanceia) is able to stay out of the water for up to 24 hours. I wonder how they get oxygen from the air. Could someone explain this?
Isaac
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1 answer
What is a lamprey's tongue derived from?
Tetrapods have tongues derived from the 2nd gill arch and nearby muscles. Lampreys are not tetrapods, and lack jaws, yet they have a tongue. What structure was this tongue adapted from?
Ichthys King
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3
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Do fish increase or decrease pH of aquarium water?
If I understand it correctly, aquarium fish produce NH3 as their waste product and CO2 due to respiration. Producing NH3 increases water pH due to its equilibrium with NH4+. Producing CO2 decreases pH due to its equilibrium with H2CO3 and its…
Irigi
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What Freshwater Fish Are Affected By Magnetic Fields
I am interested in knowing which freshwater fish are affected by magnetic fields. I've heard that Lake Sturgeon are, but would like more references. This is for a project that will have buried 3 phase power cables.
user4796
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Why are lungfish cartilaginous?
Lungfish have a cartilaginous notochord, and a reduced cartilaginous skull. Is this feature to improve flexibility, or is there another reason?
Ichthys King
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vote
1 answer
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?
蔡火胜
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vote
1 answer
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 they have been around a lot longer than other…
Janette
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vote
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Fish and microplastic particles
How does exposure of fish to microplastic particles decrease egg-hatching and give young fish a craving for them?
From Garbage in, garbage out: marine plastic 2016-06-24 | Espresso
There is more than just ocean beautification at stake; many…
Curious
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vote
2 answers
Do any fish have to hold their urine in deep water?
I know this is going to sound really weird! But I was confronted with this claim and the person strongly had faith in it! I said faith since he couldn't provide any evidence.
Is there any kind of fish that is forced to hold his urine when in deep…
azerafati
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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 what might be considered humane and also feasible…
Chris Reece
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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.
Neel
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votes
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What fish is it?
I bought this 2 weeks ago, but i forgot to ask the seller, what fish is it.
Currently the size is 1 inch.
Dini
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