Fishbase is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License.
See the bottom of the Fishbase website for details on usage.
The Fishbase API follows the same license as Fishbase. It is free for non-commercial use with attribution as defined by the terms of the CC-BY-NC license (see above). Commercial users should first contact Fishbase maintainers at www.fishbase.us/mail/MailForm.php.