The certainty of a green terror's gender can vary considerably because a green terror may start to convey signs of his or her gender really early in the fish's life or this could begin to emerge later. The possible identification also depends on the person's ability to distinguish certain traits, as well as based on experience. Some people might say that the fish are too young to sex accurately, and in some cases this may be true, but oftentimes my previous statement tends to remain accurate.
If you was fortunate to obtain a green terror in which he develops the nuchal hump early in life or at all, then yes, you more than likely can presume the green terror is a male, presuming the fish is indeed displaying the nuchal hump. I hope this helps!
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