Fish Quiz

[RobRocksFishTank]

Correct and kind of freaky looking, if you ask me.

 

[Baccus]

How does a candiru find its prey?

 

[RobRocksFishTank]

If you are referring to the smell of urea, according to this http/en.wikipedia.org/wiki/Candiru, thathas been proven false and they hunt by sight.

 

[Baccus]

Also from Wikipedi

"To hunt for its prey, the Candirú lies at the bottom of the river testing and sniffing the water for certain chemicals, such as urea and ammonia from the gills of other fish. Once they have found a fish nearby they rush with a burst of speed to the gill cavity and attaches itself with its spines. Then, it begins to gnaw a hole towards a major blood vessel and stuffs itself for no more than a few minutes, which usually causes the victim to die. It will then release itself and sink back to the river bed in order to digest its food and wait for its next meal"

 

[RobRocksFishTank]

I should have typed "urine" as I did see that. I was still working on my first coffee and confused the terms.
 
Since we haven't heard from anyone else, I'm thinking that you have the right answer.

 

[TwoTankAmin]

Maybe some science would help here here?
(click the paper to enlarge)
 

 
from http/www.researchgate.net/profile/Stephen_Spotte/publication/225211732_Experiments_on_the_Feeding_Behavior_of_the_Hematophagous_Candiru_Vandellia_cf._Plazaii/links/53fcbc6d0cf22f21c2f3fc63.pdf

 

[RobRocksFishTank]

Next question please. This fish's reputation is a bit creepy.

 

[Baccus]

Are Nile Perch and Barramundi the same fish?

 

[TwoTankAmin]

edited to remove the post.

 

[RobRocksFishTank]

I stated that they use sight in my response but left it up to the questioner as to what answer was correct. BTW, Wikipedia stated the myths as myths and offered the scientific conclusion of them using sight.
 
To answer the next question, no they are different fish.

 

[TwoTankAmin]

No they are not the same species.
 
"Nile Perch. Scientific Name: Lates niloticus. "
 
"The barramundi or Asian seabass (Lates calcarifer)....."
 
In Australia you purchace Barramundi which is Lates calcarifer but instead what you gets is either  Lates niloticus (common name Nile Perch) or Polydactylus macrochir (common name King Threadfin). 13% of barramundi tested in an Polydactylus Australian study were mislabeled
from Trade secrets: renaming and mislabeling of seafood http/seattlecentral.edu/faculty/kgagnon/OCE100/TRADE%20SECRETS%20Marine%20food%20mislabel-%20Daniel.pdf
 

Abstract

Adenine nucleotides and their related compounds were determined in muscle extracts from two species of fish that were stored in ice after thawing. The fish were the closely related species, Australian barramundi (Lates calcarifer) and Kenyan Nile perch (Lates niloticus) which had different process histories. For all samples, adenine nucleotides did not exceed 6% of the total nucleotide pool. Inosine monophosphate (IMP) decreased steadily with storage. Hypoxanthine (Hx) was the major product of adenosine triphosphate (ATP) degradation in both barramundi and Nile perch, showing a steady increase with days of iced storage. The Hx level did not reach a maximum during the 9d storage period. The K-value also increased regularly with time of storage and for the later stages (i.e., 7 and 9d) and was significantly different (P < 0.01) for the species. The iced storage life of these typical samples of barramundi and Nile perch was estimated to be 3d after thawing using a K-value of < 30% to indicate excellent quality. Despite the differences in process history the nucleotide profiles were remarkably similar during storage. This precludes the use of nucleotide levels as a means of differentiating between these species.

from http/www.tandfonline.com/doi/abs/10.1300/J030v02n02_05
 
Similar but not the same.
 
I am slow because I prefer to support my answer with some form of independent documentation.

 

[RobRocksFishTank]

I stated that they use sight in my response but left it up to the questioner as to what answer was correct. BTW, Wikipedia stated the myths as myths and offered the scientific conclusion of them using sight.

 
This post was in response to TTA who deleted his post.

 

[TwoTankAmin]

you beat me to the baramundi/perch answer too. 

  What I get for being an old and slow wordy guy....

 

[WILDER]

What I get for being an old wordy guy...
A big kiss from me. LOL.
Or A TFF key ring.  Which one would you prefer. LOL

 

[TwoTankAmin]

I will take it, Wilder.
 
And Rob- it is not up to the original poster to decide what might or might no be true. It is up to the people who actually do the research and have the results. That opinion on candiru persisted without proof for over 90 years before Spotte et. al. debunked it. I saw some of the research on it dating back to the early 1900s.
 

 
The Pygidiidae.

Carl H. Eigenmann, Indiana University.

There is a widespread belief in parts of South America that a fibh called Candiru has the vicious habit of entering the urethra of bathers. Its opercle and interopercle bear retrorse spines that are erectile. The
fish, therefore, cannot be v\^ithdrawn. An operation, if not amputation, is necessary to get rid of the pest, and if it has penetrated to the bladder it causes death. This story has been told many different travelers. Some have rejected it as beyond belief, others have added to the marvelous, while still others have tried to identify the fish.

from "Proceedings of the Indiana Academy of Science, 1917 - journals.iupui.edu" https/journals.iupui.edu/index.php/ias/article/download/13277/13295
 
Older articles are not in English but here is an example:

Die Entstehung der primitiven Heilmethoden und ihre organische Weiterentwickelung
R Hofschlaeger - Archiv für Geschichte der Medizin, 1909 - JSTOR