I am trying to identify some myctophid deep sea fishes, its very difficult to identify, so if any expert or book which is helpful for identification please tell me.
Hi Abhay. A good one is a NORDA report-3: The taxonomy and distribution of Laternfishes (Family Myctophidae) of the eastern Pacific Ocean. By Robert L. Wisner. 1974.
If you need also identify early stages I would suggest
"Richards, W.J. (Ed.) (2006). Early stages of Atlantic fishes: an identification guide for the western central North Atlantic, volume I. CRC Marine Biology Series. CRC Press: Boca Raton. ISBN 978-0-8493-1916-7. 1335 pp."
This Atlas consists known larval and juvenile stages of Myctophids.