good question.. any mature arows no drop eye..

[aznfab213]

I bought a silver when it was 4 inches. It is currently 11 inches with no drop eye.

1. Did you get him as a baby? Yea
2. Did you leave his light on all day.. or night ? Left on all day
3. What did you feed him?pellets ocassional goldfish
4. Who was his tankmates? 2 crayfish
5. How big was the tank? ...135 gal
6. were you constant about water changes..? no once every week
7. Anything extra special you can think of that you did for your
Arow?? added salt, used jebo canister filter, did not overfeed.
8. Anything other info you can offer. Very skittish fish
9. Also at any time during the duration of this thread if your arow shows signs of it or developes drop eye..please let us know..

 

[Red Devil]

I bought a silver when it was 4 inches. It is currently 11 inches with no drop eye.

1. Did you get him as a baby? Yea
2. Did you leave his light on all day.. or night ? Left on all day
3. What did you feed him?pellets ocassional goldfish
4. Who was his tankmates? 2 crayfish
5. How big was the tank? ...135 gal
6. were you constant about water changes..? no once every week
7. Anything extra special you can think of that you did for your
Arow?? added salt, used jebo canister filter, did not overfeed.
8. Anything other info you can offer. Very skittish fish
9. Also at any time during the duration of this thread if your arow shows signs of it or developes drop eye..please let us know..

yes very important... if your arow suddenly developes drop eye in either eye please let us know... it would be very important to know.. thanks for bringing this out and also adding your info Aznfab.

 

[fishdance]

There is another factor in drop eye which no-one seems to notice or comment on. The Silver arowana is a predatory fish and does use intelligence when it lines up its food. If you watch a silver aro hunt, it will judge the distance to prey (strike) as well as the distance to tank wall (avoid hitting its delicate head). This is rapidly repeated several times for reassurance. The coil before strike is a typical example. However, in clear glass tanks it is quite difficult to judge the distance to the tank wall. It knows from experience the glass wall is quite close and somewhere nearby but the more obvious things such as the distant room walls, curtains, bookcases etc will confuse it. Actively moving prey and different distances to room walls will compound the confusion. If you watch a silver before a strike there is a LOT of rapid eye movement between the prey, room wall, invisible tank wall, prey etc. It is trying to judge the space available for error and success rate of a strike. I suspect the eye muscles simply wear out or get torn from this overuse. Having smokey glass or algae covered glass tanks will help reduce this. People often say drop eye does not happen in ponds which I agree with but not because ponds make a fish look up. Prey in ponds do not always sit at the surface. Pond walls are just easier to see and don't need as much rapid/constant eye movement.

Just my 2.2 cents. Watch the fish and see for yourself. Other types of arowana such as Saratoga or Scleropages are much more bull headed and robust. Stiff bulky bodies which do not mind a bit of head bashing when striking food. The Silver aro is very lithe, flexible and accurate. It would rather miss the prey than bash its head when striking.

 

[Red Devil]

There is another factor in drop eye which no-one seems to notice or comment on. The Silver arowana is a predatory fish and does use intelligence when it lines up its food. If you watch a silver aro hunt, it will judge the distance to prey (strike) as well as the distance to tank wall (avoid hitting its delicate head). This is rapidly repeated several times for reassurance. The coil before strike is a typical example. However, in clear glass tanks it is quite difficult to judge the distance to the tank wall. It knows from experience the glass wall is quite close and somewhere nearby but the more obvious things such as the distant room walls, curtains, bookcases etc will confuse it. Actively moving prey and different distances to room walls will compound the confusion. If you watch a silver before a strike there is a LOT of rapid eye movement between the prey, room wall, invisible tank wall, prey etc. It is trying to judge the space available for error and success rate of a strike. I suspect the eye muscles simply wear out or get torn from this overuse. Having smokey glass or algae covered glass tanks will help reduce this. People often say drop eye does not happen in ponds which I agree with but not because ponds make a fish look up. Prey in ponds do not always sit at the surface. Pond walls are just easier to see and don't need as much rapid/constant eye movement.

Just my 2.2 cents. Watch the fish and see for yourself. Other types of arowana such as Saratoga or Scleropages are much more bull headed and robust. Stiff bulky bodies which do not mind a bit of head bashing when striking food. The Silver aro is very lithe, flexible and accurate. It would rather miss the prey than bash its head when striking.

i would say you definitly make alot of sense in putting the scenario together...amazing thinking actually... i agree with all your logic... totally fits together.. but what do we say when arows that are in ponds get it too... too small of a pond...

 

[ctoychik]

Thanks Very much for great information.. i appreciate you and all of you for taking the time out to write and remenber all this stuff... so far the lighting and genetics are top priority... i do not see too many areas where too much else is different... except yours have the extra love... {very powerful supplement}How big is the silver that is so far perfect.. ?

Pix of no DE aro. So far perfect not even a bulge. Completely perfect at 15". Let's see if it detereorates now that paimas are gone ... the second pix has one aro with DE starting in one eye ...<sigh> ... both are pushing 20" both have bulging eyes but only one eye with DE so far

I would say that the ones with DE have better water (appearance in any case)... cos paimas used to be real poop factories.

 

[Red Devil]

Pix of no DE aro. So far perfect not even a bulge. Completely perfect at 15". Let's see if it detereorates now that paimas are gone ... the second pix has one aro with DE starting in one eye ...<sigh> ... both are pushing 20" both have bulging eyes but only one eye with DE so far

I would say that the ones with DE have better water (appearance in any case)... cos paimas used to be real poop factories.

Keep us updated and posted...no matter what i hope he remains drop eye free... but also good to know if anything makes a difference... best to you...they are beauties.. and thanks every one for contribution... anything new let us know.

 

[[enjoyable_attempt]]

I have two arowana's. One of them is 20" and has DE in one eye. Hes jumped a few times, hit his head a few times, has ate feeders during his younger age but now is eating fish fillets and market shrimp. Hes in a 225g with the fish listed in my signature. The lights are on a digital timer to come on at 7am and go off at 10pm. They arnt regular lights, ones a 10000k white T5 bulb, the other is a 7100k Actinic blue T5 bulb. I use a FX5 and 3 ac110's to filter this tank.



My other aro is 8" and is in a 55G tank. I got him when he was only 2" with a yolk sack and hes been in this growing tank ever since. He doesn't have DE in either eyes, nor any sign of it. The lighting is just a normal "PowerGlo" bulb that turns on around 11am and goes off between 12-2am. The only other tank mates in with him are two baby 4" TSN cats. He has been eating crickets since Ive gotten him, and just recently started to accept krill. I use a marineland c-220 and a ac110 to filter this tank.



On both tanks I do weekly 30% water changes and once a month I do a 50% change. My parameters are usually perfect besides every now and again the nitrates raise a little, but nothing dangerous.

I think this sums it up, hope I didn't miss any vital information. I will also post better and more recent pictures once I buy new batteries for my camera.


Excuse these pictures, they are about a month old.


Hes about 5" here.

The bigger one at about 20"

 

[doods]

hmm weird I had the same DE with my aro the only one eye

 

[Red Devil]

I have two arowana's. One of them is 20" and has DE in one eye. Hes jumped a few times, hit his head a few times, has ate feeders during his younger age but now is eating fish fillets and market shrimp. Hes in a 225g with the fish listed in my signature. The lights are on a digital timer to come on at 7am and go off at 10pm. They arnt regular lights, ones a 10000k white T5 bulb, the other is a 7100k Actinic blue T5 bulb. I use a FX5 and 3 ac110's to filter this tank.



My other aro is 8" and is in a 55G tank. I got him when he was only 2" with a yolk sack and hes been in this growing tank ever since. He doesn't have DE in either eyes, nor any sign of it. The lighting is just a normal "PowerGlo" bulb that turns on around 11am and goes off between 12-2am. The only other tank mates in with him are two baby 4" TSN cats. He has been eating crickets since Ive gotten him, and just recently started to accept krill. I use a marineland c-220 and a ac110 to filter this tank.



On both tanks I do weekly 30% water changes and once a month I do a 50% change. My parameters are usually perfect besides every now and again the nitrates raise a little, but nothing dangerous.

I think this sums it up, hope I didn't miss any vital information. I will also post better and more recent pictures once I buy new batteries for my camera.


Excuse these pictures, they are about a month old.


Hes about 5" here.

The bigger one at about 20"

Thank you for very good info... you left nothing out...great arows you have... please now just keep us posted if any situation with them changes... just trying to keep some sort of record to see if anything we can note that predisposes the drop eye... And also any falls,jumps etc we should note.thanks

 

[[enjoyable_attempt]]

Thank you for very good info... you left nothing out...great arows you have... please now just keep us posted if any situation with them changes... just trying to keep some sort of record to see if anything we can note that predisposes the drop eye... And also any falls,jumps etc we should note.thanks

Alright, from here on in I'll let you guys know.