Reproductive biology of Psammobatis rutrum (Chondrichthyes: Arhynchobatidae) in south Brazil, south-west Atlantic
| Autor: | Mariana F. Martins, Maria Cristina Oddone |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Morphometrics biology Ecology 010604 marine biology & hydrobiology Zoology Aquatic Science biology.organism_classification Fecundity 010603 evolutionary biology 01 natural sciences Chondrichthyes Reproductive biology Arhynchobatidae Vitellogenesis Psammobatis Oviparity Ecology Evolution Behavior and Systematics |
| Zdroj: | Journal of Fish Biology. 91:443-459 |
| ISSN: | 0022-1112 |
| DOI: | 10.1111/jfb.13350 |
| Popis: | 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 (LT) ranged from 22·3 to 31·6 cm 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, LT–body mass and LT–eviscerated body mass relationships, with females being heavier and larger. Males started to mature at 25·5 cm LT and females, at 25·9 cm LT, while LT at maturity was calculated in 26·67 and 26·81 cm, 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 27·1 cm LT and ovarian fecundity was 1–12 vitellogenic follicles. The egg capsules were 2·22–2·62 cm length and had attaching fibrils on both lateral sides. Microscopically, the ventral face of the egg capsule was rougher than the dorsal face. |
| Databáze: | OpenAIRE |
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