Key points are not available for this paper at this time.
The numerous layers of these strong collagen fibers, closely bound together by cross-over collagen fibrils joining the different layers, is believed to serve at least in part a mechanically protective function and possibly as a firm anchorage for the body musculature. Single layers of the more superficial collagen fibers overlie the ceratotrichia of the caudal fin lending support to the flexible ceratotrichia and probably giving the fins additional support and rigidity.
Philip Motta (1977) studied this question.