"Prehistoric" looking fish

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That sounds about right rmk, as ive heard of FW morays living 3 years in FW and from 10-20 in BW-SW
 
Ya, I don't think they live out their full lives. I wonder if it just shortens their lifespan and they die of natural causes or if they are slowly dying since the moment you place them in freshwater. If that is the case, I feel terrible. I would hate to think I was slowly killing my fish and now wonder if mine had any quality of life :( He looked happy I think.

Another possibility that just crossed my mind is that some brackish fish can live in freshwater or rather do live in freshwater when they are young but as they mature into adults their bodies change needing them to move into more brakish or even full marine water. I would imagine it is at this point that these fish kept in full FW are dying because their aquatic requirements are no longer being met. Kinda makes sense.
 
Have you looked at Mogurnda Goby or Oxyeleotris marmorata, the Marble Goby. They can get pretty large in the wild but in captivity are rarely ever seen over 12 inches. The morgundas get to maybe 7-8 inches max. Pretty cool looking fish as well

MARBLE GOBY get well over 12 inches unless they have improper care and are stunted. There are at least 25 species of mogurnda gobys some fresh and some brackish ranging from 4cm to 20cm.
 
1a a a.jpg1a a.jpg1a aa.jpg climbing perch have a prehistoric look and dont get really big. And there are a few different types.

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Megalodoras uranoscopus. Stays smaller than nigers, more "colorful" and, most importantly, are much more armor clad.
 
Rmk those type of fish most likely go in to FW environments to breed or just to get to other place, a though im not sure, but living long term in FW weakens their immune system and makes them not so easily form their slime coat, making them not live as long in FW.
 
SawickiB said:
Rmk those type of fish most likely go in to FW environments to breed or just to get to other place, a though im not sure, but living long term in FW weakens their immune system and makes them not so easily form their slime coat, making them not live as long in FW.
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Not always true in fact a lot of times its the exact opposite alot of fish people scream need brackish water are born in salt travel to fresh or slightly brackish water and spend their entire lives there only returning to saltwater to breed like a reverse salmon run. Its called catadromous. http://www.fishbase.org/summary/Lates-calcarifer.html barramundi is on example. FW moray g tile are anadromous they are born in freshwater live in brackish not full salt from low to high salinity then breed in fresh http://www.fishbase.org/summary/Gymnothorax-tile.html. These fish very rarely enter full salt so fresh water doesent affect them the way it does other anadromous fish who live in full salt. http://www.fishbase.org/summary/Batrachoides-goldmani.html http://www.fishbase.org/summary/Thalassophryne-amazonica.html http://www.fishbase.org/summary/Potamobatrachus-trispinosus.html there are toadfish that live in full fresh. Batrachomeus trispinosus is a fully saltwater toadfish http://www.fishbase.org/summary/Batrachomoeus-trispinosus.html allenbatrachus grunniens http://www.fishbase.org/summary/Allenbatrachus-grunniens.html lives in full sat to brackish. Amphidromous fish are born in fresh or brackish go to full salt to feed on plankton then come into fresh as juvies and spend their whole lives. We cant keep lumping all brackish fish into the same boat we have to look at each one different. http://thefisheriesblog.com/2013/05...-amphidromous-oceanodromous-or-potamodromous/ sorry for the long post.
 
Thanks sharp for the info, but in captivity morays can live in BW to SW much longer than in FW, but i can see the SW isnt normal for them.
 
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