Reproduction of Raja clavata
Document source: http://fishbase.mnhn.fr/Reproduction/FishReproSummary.php?ID=2059&GenusName=Raja&SpeciesName=clavata&fc=19&StockCode=2254
 
Main Ref. Breder, C.M. and D.E. Rosen, 1966
Mode dioecism
Fertilization internal (oviduct)
Mating type
Spawning frequency
Spawning aggregation Ref.  
Batch spawner Ref.  
Reproductive guild nonguarders
open water/substratum egg scatterers
Parental Care none
Description of life cycle and mating behavior Oviparous. Distinct pairing with embrace. Polyandrous species (Ref. 89024). Paired eggs are laid and deposited on shallow sand, mud, pebble or gravel bottoms (Ref. 205, 89025). Up to 170 egg cases can be laid by a single female in a year (Ref. 3167), but average fecundity is much lower (around 48-74 eggs) (Ref. 3603, 31302). In northwestern Europe, egg cases are laid during spring (Ref. 3167) and in the Mediterranean during winter and spring (Ref. 3167). Egg cases are oblong capsules with stiff pointed horns at the corners, each containing one embryo (Ref. 205). Capsules are 5.0-9.0 cm long without the horns (Ref. 41250, 88187) and 3.4-6.8 cm wide (Ref. 41250). Egg cases are anchored with an adhesive film (Ref. 82399). Embryos feed solely on yolk (Ref. 50449). Egg cases hatch after about 4-5 months and pups are about 11-13 cm TL (Ref. 88864). Mating season from February to September, peaking in June (Ref. 74501). Adults observed to form same-sex aggregations during the mating season with females moving to shallower inshore waters approximately a month before the males (Ref 3603, 58137, 74501). Mating does not occur in the Baltic Sea (Ref. 82311).
Search for more references on reproduction Scirus
(e.g. 9948)
( e.g. cephalopods )
Entered by Garilao, Cristina V. on 11.16.99
Modified by Luna, Susan M. on 07.24.17
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