fishdance;1192307; said:CheckJr,
Thanks for your PM but I am not really sure what to tell you..... I dont doubt you have an Aro farm but there are some questions arising. I mean sexing from physical differences and behaviour should be simple to anyone experienced or who keeps fish to commercially breed. Especially when you have so many large adults to compare. Dont you watch these fish daily? I do realise they are in a pond. For example, I dont keep Asian Aro (S. formosus) but I do keep and breed S. leichardi - or rather they breed for me since I dont go out of my way to breed them specifically - and they arent that hard for me to sex and are also quite easy to gently squeeze for milt. Cannulation is also a very straightforward & common aquaculture technique but if you are afraid to even squeeze your fish then this is not for you either. Most farm would have some inferior grade stock they can safely trial on too so again I am at a loss with your answer or how to help you.
I have uploaded an aquaculture article describing tank breeding of S. formosa for you. I cant link you directly to the site since theres an aquaculture membership requirement for access unfortunately. Please download asap since I dont know how long the files are kept at this mirror site.
http://sharedzilla.com/en/get?id=100995
Fishdance,
I do watch them weekly (since the farm is located around 4 hours drive from the city). I used to stay in the farm for weeks to observe them. It's very difficult to see when they're in the ponds because the water is not clear. So we put them in the tanks to observe better. I admit that I'm still a beginner in this breeding business (only 5 years experience). However, the difficulty in sexing Super Red (SR) Arowana is such that even breeders with 15+ years experience could not distinguish male / female for certain. There are, of course, 'theories' by certain individuals for example: lower jawline (male), slimmer body (male), longer fins (male), etc. But they are not 100%. Not even close to 60%. You might want to ask other SR breeders for references.
There was this guy (I don't want to name names) who supposedly really good in sexing SR. Buyers from overseas often pay for his advise. I don't know how the legend grew. Basically, everyone in the business would have heard of his name, one way or the other. Then last year, we had a really bad dry season and suddenly on one unfortunate night it rained very heavily. Many of the fishes (hundreds of them) in the ponds died all of a sudden due to the sudden change in ph water level. I won't tell you how many that we lost that night

As for the canulation, like you mentioned, I want to try it first to the fishes with birth defects since lower quality SR still worth thousands of dollars. Thanks for the links.