Vargas and De Sostoa, 1997



Citation


Vargas, M.J. and de Sostoa, A. (1997) Life-history pattern of the iberian toothcarp Aphanius iberus (Pisces, Cyprinodontidae) from a mediterranean estuary, the ebro delta (Spain). Netherlands Journal of Zoology, pp. 143-160

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Aphanius iberus Spawning conditions Spawning period duration 14-16 [From May to August] 15.0 weeks
Aphanius iberus Female Maximum GSI value Mean of 14 [Up to 17.5] in July 14.0 percent
Aphanius iberus Male Onset of spermatogenesis March-April [Beginning of gonadal activity] ['April', 'March']
Aphanius iberus Female Oogenesis duration From March to May-June No data
Aphanius iberus Female Relative fecundity F=8.358 x 10-9 x Lt6.343 [with L < 45 mm] 9.5 thousand eggs/kg
Aphanius iberus Male Maximum GSI value Mean of 2.0 [Up to 2.6], in May 2.0 percent
Aphanius iberus Female Age at sexual maturity Before 1 [Both sex] 1.0 years
Aphanius iberus Female Resting period From September to February No data
Aphanius iberus Male Main spermatogenesis activity April-May ['April', 'May']
Aphanius iberus Female Onset of oogenesis March-April ['April', 'March']
Aphanius iberus Female Intensifying oogenesis activity April and June [Decreased in June, certainly due to the first fractioned spawning at the end of May] ['April', 'May', 'June']
Aphanius iberus Female Oocyte development The ovules displayed continuous, rapid development, in small groups No category
Aphanius iberus Male Resting period A period of repose from September to February No data
Aphanius iberus Egg Oocyte diameter 0.8-1.2 [Ovules with the larger diameter in ova] 1.0 mm
Aphanius iberus Spawning conditions Spawning season May to August ['August', 'May']
Aphanius iberus Female Age at sexual maturity Before 1 [Both sex] 1.0 year
Aphanius iberus Spawning conditions Spawning release Multiple spawning throughout the reproductive cycle Mutliple
Aphanius iberus Spawning conditions Parity Only few male and female adults of the 1+ group succeed in surviving the reproductive phase and the following winter No category