Ultimately, without pics we won't be able to ID him. However, I will say that I HIGHLY DOUBT that what you have in your possession is a black caiman. They are practically impossible for even most U.S. zoos to obtain.
However, if you can post a pic, we will most likely be able to tell you what you have.
Take care,
Chris
>>Thought I might add that I have this caiman in an 8x8 foot cage on the ground with a 3 ft kiddy pool containing aquatic plants. Pool is shaded and our summer daytime temps are in the 90s. Other parts of cage get part sun. He has a dry place to hide if he wants also. I plan to mostly feed him several kinds of fish. I think I'm meeting his needs for right now. Should I feed him at night and how often should I feed him? thanks
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