For exact identification I would need better images. However, please find some hints below:

1) Ogcocephalidae

3) Tetraodontidae

4) Scorpaenidae  Pterois sp.

5) Uranoscopidae  Uranoscopus sp.

6) Scorpaenidae  Pterois sp.

7) Antennariidae

8) Mullidae  Parupeneus sp.

Dear Krishnan Silambarasan,

For better identification you can upload one more picture of different side view. But for your better identification you can see the scientific name and link.

Sl No.     Scientific Name      English Name

1. Halieutichthys aculeatus- Pancake Batfish

2. Xiphasia setifer- Snake Eel Blenny

3. Tetraodontidae (Arothron meleagris)- Puffer Fish 

4.  Scorpaenidae  (Pterois sp.)- Lionfish

5. Uranoscopidae  (Uranoscopus sp.)-Stargazer

6. Scorpaenidae (Pterois sp.)- Lionfish

7. Antennariidae (Fowlerichthys ocellatus)- Frogfishes

8. Mullidae (Parupeneus heptacanthus)- Mullet (Striped red mullet)

I think this link and names will be helpful to your identification.

Regards,

Abdulla-Al-Asif (Bangladesh)

https://en.wikipedia.org/wiki/Pancake_batfish

http://www.fishbase.org/summary/7563

https://adlayasanimals.wordpress.com/2014/07/27/pufferfish-family-tetraodontidae/

https://en.wikipedia.org/wiki/Pterois

http://fishesofaustralia.net.au/home/genus/1566

https://en.wikipedia.org/wiki/Pterois

http://www.fishbase.org/summary/FamilySummary.php?ID=192

http://www.fishbase.org/summary/3085

http://www.pageconcept.org/perciformes/rougets/rougets.htm

http://www.pageconcept.org/perciformes/rougets/mullus.htm#surmuletus

Thanks for the additional suggestions. However, some of these identifications seem speculative. For instance, the identification as Fowlerichthys ocellatus is certainly incorrect as that species is restricted to the western Atlantic (and the colour pattern of antennariids is highly variable; for identification you need a detailed view of the esca).

Dear Sir,

Thank you for your identification.

Regards,

K. Silambarasan