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In page Chain catshark:

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In the female chain catshark, follicle development has been correlated to nidamental gland size, thus, they are considered mature when they have a fully developed nidamental gland or shell gland.[2] This is marked by the glands growth to 1.8 cm (0.7 in) or more in width. Sexual maturity in the female is seen at 52 centimeters (1.71 ft) in length under normal conditions. There has been evidence however that some northern populations of the shark may mature at a smaller size, at 41 centimeters (1.35 ft). In the male catshark, testis development is correlated to clasper size, thus maturity is marked when it develops hardened claspers that are 3 cm (1.2 in) or more in length.[2][3] Males reach maturity at a length between 37 and 50 centimeters (1.21–1.64 ft).[1]