Gill rakers in fish are
bony or
cartilaginous processes that project from the
branchial arch (gill arch) and are involved with suspension feeding tiny prey. They are not to be confused with the
gill filaments that compose the bony part of the gill. Rakers are usually present in two rows, projecting from both the anterior and posterior side of each gill arch. Rakers are widely varied in number, spacing, and form. By preventing food particles from exiting the spaces between the gill arches, they enable the retention of food particles in filter feeders.