Question

Why did the inhabitants of the Emirates practice sea activities give reason

Answer 1

The Aral Sea used to supply its local inhabitants with commercial fishing. Since the sea evaporated, you can literally sea the hulks of the former fishing vessels stranded on the dry seabed.  

Most of the water that was diverted from the Aral Sea today supplies agricultural irrigation for Uzbekistan. The Uzbek government considers the cultivation of cotton to be more valuable than the fishing industry formerly provided by the Aral Sea.