Their is a set of bathymetric maps of Algerian coasts but not in numerical version, they are thalassa maps 

Hi

You have the Global Bathymetry Chart of the Oceans.

http://www.gebco.net

ETOPO5 Global Surface Relief: http://las.nio.org/las/UI.vm

You can find better resolution data at EMODNET:

 http://portal.emodnet-bathymetry.eu/mean-depth-rainbow-colour-ramp-no-land-data

Grazie, Thank, Merci, Choukrane

Emodnet is a good source, though for this area it will only be a resampling of the GEBCO at 250m.

the etopo would provides 5' 2' 1' data with your requirement (http://www.ngdc.noaa.gov/mgg/global/global.html), you can draw them with Surfer software. You can also draw the bathymetric map  if you download the bathymetric data with ODV software. hope them helpful.