pacu afraid of the light - Tropical Fish Keeping - Aquarium fish care and resources
 
LinkBack Thread Tools
post #1 of 5 Old 04-17-2010, 11:27 PM Thread Starter
New Member
 
pacu afraid of the light

i have a red belly pacu in my 90 gallon and it wont come out with the lights on..its gotten to the point where i have to leave the light off at all times,, why is this?
statenfish is offline  
Sponsored Links
Advertisement
 
post #2 of 5 Old 04-18-2010, 11:23 AM
Member
 
Byron's Avatar
 
There are a couple of possibilities. First, these fish occur in very dimly-lit waters; when placed in brightly-lit aquaria, such fish frequently become severely stressed. You mention it won't "come out" so presumably you have some sort of hiding spots for it which is good. Lessening the aquarium light is one suggestion; floating plants might help but the pacu is liable to eat them.

Second, these are characins and thus shoaling fish that prefer to be in groups. I have read of single fish being maintained in large aquaria with other suitable fish; do you have anything else in this tank?

Last comment, this is really not a suitable fish for the average home aquarium. It can grow to over 30 inches, requiring a tank of 200 gallons or more. While it may be a juvenile (?) now and seem OK in a 90g tank, it is a potentially large fish that requires a lot of space from early on if it is going to develop properly internally and be in good health.

Byron.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
Byron is offline  
post #3 of 5 Old 04-18-2010, 02:23 PM Thread Starter
New Member
 
this is his temporary home..he will be moved in to the 400 gallon when it is completed in a few weeks. there is a pleco wit him and and anither pacu added last week...the light is very dim and there are places to hide..the 400 hundred is basicaccy an exact replica of the pacu habitat so maybe after the move he will settle down a bit
statenfish is offline  
post #4 of 5 Old 04-18-2010, 05:00 PM
Member
 
Byron's Avatar
 
Quote:
Originally Posted by statenfish View Post
this is his temporary home..he will be moved in to the 400 gallon when it is completed in a few weeks. there is a pleco wit him and and anither pacu added last week...the light is very dim and there are places to hide..the 400 hundred is basicaccy an exact replica of the pacu habitat so maybe after the move he will settle down a bit
That is music to my ears. I'm glad you have plans to provide what the fish requires, well done. In the interim, I suggest either leaving the light off (no plants presumably to worry about light for) or somehow reduce it and shade it as best you can.

A few weeks back I posted a couple photos of pacu in a floor-to-ceiling tank at the Vancouver Aquarium, it may interest you if you didn't see it previously, so I'm attaching it. The group of 4 (I think) pacu are in with two arapaima and a group of Leporinus. You can see how dim this tank is lit, notwithstanding my poor camera skills.

Byron.
Attached Images
File Type: jpg Amazon Arapaima1.jpg (60.4 KB, 22 views)

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
Byron is offline  
post #5 of 5 Old 04-18-2010, 07:45 PM
New Member
 
In general, young pacus are pretty skittish, alone or in groups. They do grow out of it with age, but can still startle easily. Try to avoid any sharp wood or rocks in the tank, they are very powerful and can injure themselves.

You might consider some smaller active schooling fish to make them feel a little more at ease, I like giant danios for this. If the pacus are smaller than 4-5 inches, you can use zebra danios instead.

I don't think light itself is the big issue unless it is very bright, they are prob just scared in general. However, if you want to darken the tank, a good trick with 2 piece fluor hoods is to insert cut to size pieces of thin cardboard between the light and glass wherever you want a darker area. They are easy to move/remove when you desire too.

I love pacus! I have raised several over the years, they get quite a personality when they get older. My last one was like a member of the family, it broke our hearts when we gave him up
Posted via Mobile Device
herbwin is offline  
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
My platy died, I'm afraid to lose more fish. Please help! NinaZ Tropical Fish Diseases 8 07-19-2008 01:03 AM
Rainbow shark is afraid in new tank izzy4505 Cyprinids and Atherinids 6 06-14-2007 10:49 PM
who's afraid of the big-bad-wolf The-Wolf Introduce Yourself 8 03-16-2007 12:01 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome