Reproductive biology of Psammobatis rutrum (Chondrichthyes: Arhynchobatidae) in south Brazil, south-west Atlantic

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Martins, M. F. [UNESP]
Oddone, M. C.

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This study presents information on the reproductive biology of Psammobatis rutrum based on 55 males and 53 females obtained as by-catch from bottom trawlers off southern Brazil during July 2013 and September 2014 and includes a detailed description of the egg capsule. Total lengths (L-T) ranged from 223 to 316cm and most of the sample comprised larger individuals, although there were no sexual differences in length-frequency distributions. Significant sexual differences were found for total length-disc width, L-T-body mass and L-T-eviscerated body mass relationships, with females being heavier and larger. Males started to mature at 255cm L-T and females, at 259cm L-T, while L-T at maturity was calculated in 2667 and 2681cm, respectively. Attaining larger sizes and mass may represent a reproductive investment for females, as observed in other rajoid species. Egg bearing females were first observed over 271cm L-T and ovarian fecundity was 1-12 vitellogenic follicles. The egg capsules were 222-262cm length and had attaching fibrils on both lateral sides. Microscopically, the ventral face of the egg capsule was rougher than the dorsal face.



clasper, egg capsule, fecundity, morphometrics, oviparity, size at maturity

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Journal Of Fish Biology. Hoboken: Wiley, v. 91, n. 2, p. 443-459, 2017.