Dear Abdul-Nabi Nasir, 

since juvenile nusery grounds are complex habitats it is important to define before the main aspects  you want to investigate. For instance if you are interested in microhabitats use during settlement stages man-made underwater inspections are recommended. By contrast, if you want to characterize main habitats features at larger scale you could use remote sensing techniques such as aerial imagery from satellite, airborne or drones according to the degre of resolution you need. Finally, also the studied species is another key factor that can influence the type and the effort you have to carry on.

Reagards,

Daniele

Dear Daniele Ventura ,

Thanks for your valuable remarks. Theses remarks are very useful. Thanks  Regards

Please have a look at these useful links.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5268461/

http://www.sciencedirect.com/science/article/pii/S168742851400003X

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4364973/

Please have a look at  PDF attachments also.

Dear Arvind Singh,

Thanks very mush for the links and the attachments. They are very useful. Thanks for your support. Regards

http://www.wishh.org/wp-content/uploads/2014/11/Handbook-Chps-9-11.pdf

http://www.habitat.noaa.gov/pdf/fishandwetlands.pdf

Dear Firoz Ahmad ,

Thanks very much for these links. Regars

The best way to find the nurseries grunds of demersal marine fishes on a large scale it is by means of trawl surveys statistically planned in space and time.

Dear Leonardo Cannizzaro ,

Thanks for your feed back. I agree with totally because I did try this in the firth of forth, scotland, uk

Regards