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Contribution à la biologie de Rajidae des côtes tunisiennes 14. Raja polystigma Regan, 1923: répartition géographique et bathymétrique, sexualité, reproduction, fécondité = Contribution to the biology of the Rajidae of Tunisian coasts 14.Raja polystigma Regan, 1923: geographic and bathymetric repartition, sexuality, reproduction, fecundity
Capapé, C.; Quignard, J.-P. (1978). Contribution à la biologie de Rajidae des côtes tunisiennes 14. Raja polystigma Regan, 1923: répartition géographique et bathymétrique, sexualité, reproduction, fécondité = Contribution to the biology of the Rajidae of Tunisian coasts 14.Raja polystigma Regan, 1923: geographic and bathymetric repartition, sexuality, reproduction, fecundity. Cah. Biol. Mar. 19(2): 233-244
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723; e-ISSN 2262-3094
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  • Capapé, C.
  • Quignard, J.-P.
Abstract
    R. polystigma is a Mediterranean endemic species, caught off Tunisian coasts but most frequently off northern shore. Sexual maturity is reached by the males by 34 cm of disc width and 53 cm of total length and by the females by 40 cm of disc width and 63 cm of total length. Reproduction would take place all the year round but is subjected to season changes; females with egg-capsule are chiefly caught during winter. Fecundity would reach from 20 to 62 eggs-capsules per year; there is a relation between size of R. polystigma and fecundity. Egg-capsule average size is 4 . 64 cm of length (without horns); 3 . 54 cm of large and 9 . 4 g in average.
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