Biological data are presented for the pygmy ribbontail catshark Eridacnis radcliffei based on specimens collected from the by‐catch of the commercial deep‐sea shrimp trawl fishery operating in the Arabian Sea off the south‐west coast of India. A total of
549 individuals, from 101 to 257 mm total length (LT) and 2·2 to 56 g, were collected. The LT at first maturity (LT50) of females and males was estimated at 183 and 170 mm, respectively, and analysis of stomach contents revealed
that E. radcliffei feeds primarily on crustaceans.