Reproduction of Thunnus thynnus
Document source: http://fishbase.mnhn.fr/Reproduction/FishReproSummary.php?ID=147&GenusName=Thunnus&SpeciesName=thynnus&stockcode=161
 
Main Ref. Collette, B.B. and C.E. Nauen, 1983
Mode dioecism
Fertilization external
Mating type
Spawning frequency variable throughout range
Spawning aggregation Yes.   Ref.  SCRFA, Science and Conservation of Fish Aggregations, 2018
Batch spawner Yes.   Ref.  Baglin, R.E. Jr., 1982
Reproductive guild nonguarders
open water/substratum egg scatterers
Parental Care none
Description of life cycle and mating behavior Oviparous batch spawner, with an inter-spawning interval of 1-2 days in the Mediterranean Sea (Ref. 88871). Females larger than 205 cm fork length are estimated to have a mean fecundity of 30-60 and 13-15 million eggs, in the western and eastern Atlantic respectively (Ref. 40805, Ref. 88871). Spawning occurs when sea surface temperatures are between 22.6-27.5 ºC and 22.5-25.5 ºC in the Gulf of Mexico and Mediterranean Sea respectively (88868). Spawning occurs between June and August in the Mediterranean Sea (Ref. 88868). Eggs are released directly to the water column and hatch after 2 days (Ref. 88823). At 24°C, embryo development lasts about 32 hours and larval stages about 30 days. Egg size 1.0 mm, larval length at hatching 2.8 mm. Spawning grounds are mainly known from the Gulf of Mexico and the Mediterranean Sea, but the presence of mature individuals and larvae far from these areas (e.g. Bahamas and central North Atlantic Ocean) suggest that other spawning grounds may also be utilized (Ref. 88873, Ref. 88874, Ref. 88872). Appears to display homing behaviour with (western-tagged individuals migrating back to specific spawning sites either in the Gulf of Mexico or the Mediterranean Sea) (Ref. 88872, Ref. 88870). Fidelity to natal areas seem to occur once individuals reach maturity, i.e. after returning to either the western or eastern spawning grounds (Ref. 88868).
Search for more references on reproduction Scirus
(e.g. 9948)
( e.g. cephalopods )
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