Who Cratered the Internet?

The ADSM should be able to give you some basic charts and graphs regarding traffic. You may want to try this first if all you need is a basic idea.

Other than this you would need to implement a traffic sniffer to listen to all traffic traversing the ASA. The ASA's support monitor ports so this should not be an issue.

in the asdm there are some monitoring statistics. not sure how detailed they are, I could check for you.

you could enable the logging and just watch for the ip sending the most traffic

All in the ASDM which Im sure you know can be accessed through yr web browser  https://(internal IP of the ASA)

Gentlemen - thanks for the comments - perhaps I should have been more specific. I need to watch the aggregate and / or the immediate packet rates for internal ip addresses. I need to map traffic back to specific ip addresses.

I do not think Wireshark has any ability to give you advanced reports, however the more advanced traffic analyzer packages come with better reporting capabilities.

if you have a managed switch that can do mirroring of ports, you can use ntop.  just mirror the switch port the firewall is connected to, to the sniffer server with ntop.  

Please have a look here:

https://www.experts-exchange.com/questions/23511774/How-can-I-monitor-bandwidth-usage-with-a-new-Cisco-ASA-5510.html

Hmmm - so it's possible that by upgrading the image on the firewall so I get ASDM 6 that I may have what I'm looking for? The version of ASDM I'm currently being presented with is 5.2... does thta make sense to our experts?