Sexing fish questions

[Aquaticfan]

As the title says. I've got some questions on how several of you sex a fish from visual/picture.

Is there something you are looking for in all species or is it specifc things for specific fish? What things do you look for? How large/old can most be sexed? Is there a very for sure method like venting?

I've got roughly 10 to 12 different breeds of fish I'm looking to sex I've got 2 of each. I'm trying to end up with just males. Except for my festae. I'd like to end up with a male and female.

Would it just be better if I told you what I've got and had some pics of each?

Doing africans for so long it was easy to figure it out. Younger ca/sa cichlids a lil different.

Thanks for any help and suggestions. I'd like to thin the heard.

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[vinod_uthaiah]

Yes, there are some significant things that tell ethe male and female apart in few varieties of cichlids.
Few could be Nuchal hump , marking around the eyes ( in case of JD's) and few more.
A side profile shot of the fish , which is more than 4 inches can be the best.
In order to help you , names and good side shots of your fishes will serve better.