What is this?

sam buckle

Feeder Fish
MFK Member
Mar 19, 2008
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cornwall
it is where the yolk sack is attached while in the womb. sometimes pups are born a little prematurely with it still attached.
thie is know as
Ovoviviparity (or aplacental viviparity), is the only mode of reproduction employed by rays. In rays, the embryos rely on the substantial yolk within the ovulated egg only during the initial stages of development. After the nutrients stored in the egg have been consumed, the embryo ingests or absorbs an organically rich histotroph (or “uterine milk”) produced by the mother and secreted into uterus. The most highly developed of these strategies occurs in some rays in which the lining of the uterus forms tiny, finger-like projections (termed trophonemata) that increase the surface area for histotroph secretion. This form of nutrient supply (or maternal investment) results in very large offspring, which is characteristic of most species of ray.

hope that was interesting
 
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