Sajjad,
I can't recommend any general zoology textbook, but just about the best
ichthyology textbook is by a NANFA member:
"The Diversity of Fishes" by Gene Helfman et al. See
http://sparc.ecology.uga.edu/~helfman/fishes.html
Scroll down to bottom for shamless self-promotion department.
Christopher Scharpf
Baltimore
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