When I try and use the Fishing Rod using my offhand/left hand, the rod gets used but it just disappears after about 1 second. i tried use the main hand/right hand it works. I don't know if this is intentional or a bug...
Environment
Windows 7 Home Premium, 64bit , Java Version jre1.8.0_66, i7-3612QM CPU @ 2.10 GHz, RAM: 4 GB
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-83185. You can find or add further information on that report.
If you haven't, please search before reporting any bugs, as it's likely that one exists already.