first take fish pieces.

Next maraniate the fish, add Chilli powder, turmuric,oil, lime juice, salt, biryani masala mix well and keep a side for 30min.

In a pan add little oil and cook the maraniated fish and keep a side.

In the same pan add curd, biryani masala 2t mint leaves, coriander leaves, dill leaf, ginger garlic paste, lime juice,green chillies, salt,fried onions half, mix well and add half of the mixture to the cooked fish.

Now boil the Rice, half cooked rice.

Now in the masala pan add the half cooked rice spread evenly add colour, onions, then spread the Fish pieces and masala. 

cook for 20 min by closing the lid in very slow flame.