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Revista chilena de historia natural

Print version ISSN 0716-078X


BRACCINI, JUAN M.  and  CHIARAMONTE, GUSTAVO E.. Biology of the skate Psammobatis extenta (Garman, 1913) (Batoidea: Rajidae). Rev. chil. hist. nat. [online]. 2002, vol.75, n.1, pp.179-188. ISSN 0716-078X.

Psammobatis extenta is a common off-shore member of the South American skate fauna and its biology is poorly known. Aspects of the biology of P. extenta were investigated using data collected from bycatch of commercial trawls in February 2000 off the coast of Puerto Quequén, Argentina. The maximum size attained by females was 313 mm TL and 295 mm TL, by males. Measurements that presented less variation and isometric relation were: nare to mouth length, distance between orbits, orbit and spiracle length, disc length and disc width. There were significant differences (P < 0.05) in the TL -Total weight relation between females and males, the former attaining a greater weight for the same TL. Males reach maturity between 260 and 266 mm in length, about 89 % of their maximum size. Females reach maturity at a length of 236-255 mm, about 79 % of their maximum size. Gravid females (13 % of the mature females) presented one egg case per oviduct (single oviparity). There is sexual dimorphism in dentition and alar spines: mature males have pointed conical cusps and possess alar spines along the outer margins of the upper disc, whereas female and immature males have grinding blunt teeth

Keywords : Psammobatis; Rajidae; Puerto Quequén.

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