Being someone who has targeted Tautog/Blackfish my entire life the males are definately the white chins with the blunt head.
Females have a tendency to be a little more pointed in their body makeup where males are usually more box like.
This is a very slow growing species so please only take what you need and return the rest.
This website will give some good info on the species.
tight lines,George
http://www.edc.uri.edu/restoration/h...ish/tautog.htm
Tautog