The life span of Oscar fish are generally 10 – 13 years.
It's very difficult to tell the gender of your Oscar fish just by looking at it.
In general, the fish grows during it’s lifespan continuously. But growth can be affected by low pressure in your fish tank. If the depth is 1m at least, then it should grow up to 30-40cm. If course, the remaining two dimensions are imporant as well. If your aquarium is 4x2x1.5m big at least, then it OK for future growth. In any smaller aquarium Oscars may (but it’s not guaranteed) grow up to 30cm.
A fact that not many people are aware of is a sump filter can often automatically transform itself into a nitrate filter, as well as functioning to remove ammonia and nitrite. I know this sounds hard to believe but let me explain how this happens. Your filtration system is not only there to remove dangerous toxins, it also removes fish poo, dirt, uneaten food and any other rubbish that you find in an aquarium. All this nasty stuff eventually turns into a sludge that settles in the bottom of your filter. A lot of this sludge will collect in areas of the filter that receives no water movement when this happens anaerobic bacteria grow in the sludge as they do not require oxygen to survive. Remember that the opposite of anaerobic is aerobic. Aerobic organisms such as nitrifying bacteria are responsible for removing ammonia and nitrite, but these need oxygen to survive. Now, this is the really clever part, the particular anaerobic bacteria that are living in all this sludge consume nitrate, so actually, all this horrible gooey mess that collects in your filter is actually working as your friend. Now obviously there is a fine balance between how much sludge you leave in your filter, and when you have the clean it. Actually, it's not really something you have to worry about, most of this sludge that collects won't be affected by filter cleaning as it will find its way into dead areas in your sump, so you can still clean the filter without worrying about completely removing all your anaerobic bacteria. To give you an idea of just how efficient a large sump filter can be, take a look at my 75-gallon sump filter which services my 300-gallon aquarium that contains four large adult Oscars. I cleaned my sump for the first time in a year a few days ago. Don't get me wrong, I have cleaned the mechanical filter sponges quite a few times as these do get clogged up, but I haven't actually emptied the sump completely. I can hear people saying "OH MY GOD, your water must be absolutely disgusting" well, it's quite the opposite, my nitrate levels are always low, even if I leave the tank for two or three weeks without carrying out a water change. This is purely down to the fact that my sump filter is now also functioning as a partial nitrate filter.
Tiger Oscar Fish Tank Mate | Tiger Oscar Fish Gender (Urdu/hindi)
Vieja Argentea Gender? - Oscar Fish Advice Forum - Oscar Fish Care
For now only some links since we're still under heavy construction here! Quick infooff the top of my head, they grow fast! Intelligent fish, eat a LOT. Yes, poop a lot too,so needs very good filtration and frequent water changes. Grows up to 16", butusually stop at 12" in aquariums. A 65gallon is good for two 6-10". You should have 100gallon or better for larger than 10". Get them young andwatch them grow! I will post some very INTERESTING info about breeding and determining sexof oscars later on. I guarantee it will surprise many. Lots of info to come, on breeding,and raising healthy oscars. Please bookmark! Main page is Oscars are aggressive freshwater fish that are originally from Peru, Colombia and Brazil. Sometimes it can be very difficult to tell which sex these fish are because the males and females of this species have no color difference like with many other species of fish. The easiest way to tell whether your fish are male or female is by simply watching the Oscars. It is much easier to discover the gender of your fish if you have more than one Oscar in the same tank.