Larrys Replacement
#21
Posted 01 November 2011 - 08:27 PM
And FYI - the stingray you posted a picture of is Potamotrygon brachyura and NOT Potamotrygon motoro like I own. Obviously a 'big' difference between the two.
Back on topic. Best of luck with the PJ Nick. Be sure to update pics as it growns. Some feeding pics would be great too. Always interesting to see how prehistoric fish feed, so many different mechanisms to do so.
Alex
#22
Posted 01 November 2011 - 08:53 PM
#23
Posted 01 November 2011 - 11:48 PM
No way these guys are fitting in a 6x2
http://www.avocabeac...ub/Image044.jpg
http://www.smh.com.a...eb__430x295.jpg
Just to back up Alex's comment there's a serious shark keeper from MASWA that would agree. Should be fine as a pup but not so good long term. Water needs to be pristine. Let me know if u want more info about him and ill try to find some.
Daz
#24
Posted 02 November 2011 - 08:04 AM
Thanks Daz any info is great, cheers
#25
Posted 03 November 2011 - 09:28 AM
#26
Posted 03 November 2011 - 10:11 AM
Great study on age and length comparisons. Just incase you don't want to read the whole thing (i only skimmed it) if you follow the growth curve 4years old = ~50cm and 7years = ~60cm (fork length). Was more than likley done on wild caught animals (again didn't read it in its entirity), what I found interesting was that they use markers on the dorsal spine, most fish ageing techniques usually use otoliths (fish ear bones), this is done by either staining the otolith with a chemical marker, so you can see the growth of the otolith since the date of staining. Can also count the rings of the otolith in some species, each ring is ~12months. Aquarium PJ's could probably grow a little faster due to; ample food, and increase in metabolism (due to increased water temps) and a decrease in energy expenditure.
Alex
Edited by Peckoltia, 03 November 2011 - 10:32 AM.
#27
Posted 04 November 2011 - 09:48 PM
It's actually a Potamotrygon schuemacheri (Parana River Stingray)
Not having a dig , just thought if you are going to point out a species name we might as well get the right one , I realize that it's not a motoro
#28
Posted 05 November 2011 - 09:48 AM
Not having a dig , just thought if you are going to point out a species name we might as well get the right one , I realize that it's not a motoro
Hi Scott.
I already had the name correct to begin with. P. schuemacheri is actually a small species of stingray. Juveniles can be confused with P. brachyura. But there is no confusing one at this size. Most certainly P.brachyura that you posted and NOT P.schuemacheri. Your sources are all wrong mate. Go back and check them out.
Here are a couple links for you -
Firstly this, which even has the actual picture you used. Discovery says P.brachyura.
Then there are these exact same type of stingray you posted a photo of, again P.brachyura.
Isn't a whole heap on P.schuemacheri on the net but this the information from the IUCN redlist states that this species is a small species of ray.
I'm just not really sure how posting that pic of a stingray species that isn't available in Australia (and obviously a species I don't keep) was relevant to a thread on Port Jackson sharks?
I'd say this is more or less case closed!
Happy fish keeping,
Alex
edit - spelling
Edited by Peckoltia, 05 November 2011 - 09:57 AM.
#29
Posted 05 November 2011 - 10:05 AM
cheers, Scott
#30
Posted 05 November 2011 - 10:52 AM
#31
Posted 05 November 2011 - 10:57 AM
#32
Posted 05 November 2011 - 11:29 AM
#33
Posted 05 November 2011 - 04:37 PM
#34
Posted 07 November 2011 - 03:13 PM
Alex
#35
Posted 07 November 2011 - 07:09 PM
I'll keep a journal going, once a month I'll post an update
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