Posted 31 December 2007 - 05:52 PM
Noticed this section (my fave!) hasn't been too active of late, so thought I'd throw something in from our archive...
....a few years back while diving the Exmouth Navy Pier, I spotted this deformed looking trevally on consecutive dives. I eventually got a shot of him and emailed to a couple of marine biologist friends who couldn't provide me with much insight into the reason his spine is out of shape (ie what disease it has and whether similar to a human spinal abnormality)....I thought some of you smart cookies might be able to shed some light?
It would also be interesting to see any other shots/ vision of fishies with disabilities- this little guy was determined to keep up with all the other able-bodied trevally, what a little trooper huh?!
Posted 01 January 2008 - 07:03 AM
Posted 02 January 2008 - 02:34 AM
Posted 02 January 2008 - 11:19 AM
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Posted 02 January 2008 - 11:15 PM
Seriously though, I am looking forward to hearing what zan discovers in his book!...I have become a bit posessed with this little trevally (as Wags will confirm!)
Posted 03 January 2008 - 06:12 AM
Unfortunately my book doesn't really have much more information. It mentions that spinal deformities can be caused by a parasite which can lead to whirling disease, but unless your fish is whirling, it's unlikely (if only all illnesses were so self-explanatory, eh?). Nutritional factors and genetics have been the reported causes in farmed fish (e.g. salmon\bass), so that might be something?
sorry I can't be much help! I'll let you know if I find out any more, I'm getting curious myself now
Posted 03 January 2008 - 06:32 AM
The shark is observed on a regular basis over the last 2 years . It is a regular attendee at our weekly shark attraction dive and appears to have no issues swimming or feeding.
The first time I saw it I thought that the shark was demonstrating a threat posture - lucky for me I was mistaken
Will try to find some footage and post it when I get back to Cairns.
Edited by pmooney, 03 January 2008 - 06:33 AM.
Posted 03 January 2008 - 08:40 AM
there are quite a few reasons i think. If they have been selected for farming and get to live older than they would usually they often get deformed, which is what happened to our cod. If they have been kept in a round tub from an early age and only swim round in one direction that can cause it too.
In wild fish, it's possible that some are prone to it. Sand tiger sharks have big problems with spinal deformities in aquariums but it has also been seen in the wild and nobody knows what causes it. Also, if a wild fish has damaged itself somehow that can make the spine deform as it tries to heal/correct itself.
hope this is a bit more help!
Posted 03 January 2008 - 04:56 PM
Would be cool to see your shark vision Peter- I'll look forward to that when you get home!
Posted 04 January 2008 - 02:23 AM
Posted 28 January 2008 - 05:43 PM
I don't know about fish, but in snakes, once the egg is laid-it must remain totally immobile. If it is moved it may allow the embryo to reattach on another part of the shell and may cause a "kinking" of the spine which is noticeable at hatching.
Maybe the same can be true of fish eggs, that are meant to stay immobile.
Posted 08 March 2008 - 05:59 AM