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Erren
i've search through this forum and have no luck finding any info about fish's age. I was wondering how can we tell fish's age depending on their size?? Is the any standard size = particular age?. I assume different bread such as Ryukin and ranchu may have slight different in size. Ranchu would be slightly longer than ryukin. How can me compare the two fishes and tell their age?? --> (apple vs lemon)
The Matrix
No, size is subjected to handling, genetic and varieties of fish.. Not a guide to age.

you will hv to ask the supplier or the actual farm owner when was the estimated period of spawning.
gohks
QUOTE(Erren @ Tue, 24 Jan 2006 4:55 pm)
i've search through this forum and have no luck finding any info about fish's age. I was wondering how can we tell fish's age depending on their size?? Is the any standard size = particular age?. I assume different bread such as Ryukin and ranchu may have slight different in size. Ranchu would be slightly longer than ryukin. How can me compare the two fishes and tell their age?? --> (apple vs lemon)
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Well for those fish you got when they are near maturity is hard to find out the age, unless you do your own breeding. I once checked with a LFS on the age of the fish but yield no clear answer (don't think they will know as most fishes are imported without a birthcert tongue.gif , not like Arowana which comes with certificate).
I remember reading somewhere the scientific way of finding out the age of a fish is thorugh examining the no. of rings found on the fish scales. Maybe experts here can shade further lights on this topic. uhm.gif
The Matrix
QUOTE(gohks @ Tue, 24 Jan 2006 9:59 pm)
I remember reading somewhere the scientific way of finding out the age of a fish is thorugh examining the no. of rings found on the fish scales.  Maybe experts here can shade further lights on this topic. uhm.gif
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Wah sei ... you doing your homework. Yes, scale line is like cross section tree truck line to determine the age. However, might not be as accurate as the documentation of such measurement is not well defined. With over 3 major varieties, 600+ sub variations, not going to be easy.
goldrush
The concentric circle viewed from the scale is only accurate in temperate countries where seasons varies.The width of the rings correspond to the growth spurts which coincide with the summer growing months in these zones.But in the tropics everyday is a growth day and probaby you cant really tell as there is no clear width demarcation of the rings in each scale.Hope I am not wrong in writing.this....
d_golem
Yep, scales are not an accurate way of determining age. The most accurate is by using the fish's otolith (ear-bone). Dunno how they do it but it's gotta be done in the lab. U'll get a very accurate result with that particular method.
goldrush
Oh yes otolith measurement is another form of estimation of fish age.However I think you need to slaughter the fish to achieve such measurement as the otolith is actually the earstone behind the brain of all bony fishes.The principle is the same as in the counting the annuli (concentric circle)of fish scale or annual rings of the tree.Under reflective light one can see alternate transluscent area which represent growth spurts and opaque areas which represent period of lull growth very much like the annuli seen .

Below is a picture of what I'm trying to say

IPB Image
gohks
Hmm hmm.gif , kill a fish to know the age shiok.gif like product line practising sampling destructive test ohmy.gif
The Matrix
hahahaha ... that's the way to know how old the fish WAS ... becos it will never live past the day one took that piece of thing out.
Erren
wow, u guys seems to know lots of things beg2.gif beg2.gif beg2.gif . Are u guys proffesors or some kind of doctors?
white horse T1
QUOTE(Erren @ Wed, 25 Jan 2006 5:50 am)
wow, u guys seems to know lots of things  beg2.gif  beg2.gif  beg2.gif . Are u guys proffesors or some kind of doctors?
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in our local terms, they are known as "HEE SIAO" and have PHD cert for that. biggrin.gif
(meaning Fish Nutcase with Permanent Head Damage cert)
goldrush
QUOTE(Erren @ Wed, 25 Jan 2006 5:50 am)
wow, u guys seems to know lots of things  beg2.gif   beg2.gif   beg2.gif . Are u guys proffesors or some kind of doctors?
*




Yep there is a pHD holder in the form of cp here

but most unfortunately he is just only a


PORNOGRAPHY HEAD of DEPARTMENT


hysterical.gif hysterical.gif hysterical.gif
CP
bash.gif
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