Bobbers are glitch, they float above water and for some reason don't have those black metal pieces. Texture pack didn't change anything (theres also a picture attachment).
MC-76668
Bobber glitch
Resolved
Duplicate
0
Karlis Korlass
(Unassigned)
Unconfirmed
Minecraft 1.8.1
Retrieved
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-11877. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.