Fernandez-Delgado, 1988



Citation


No detailed citation.

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Aphanius iberus Female Female sexual dimorphism Males mature before famles, but females were larger than males Absent
Aphanius iberus Female Maximum GSI value Two maxima: one in April [mean of 13, up to 14.5] and a second in August-September [mean of 3, up to 4]. Each maximum represented females of different ages 13.0 percent
Aphanius iberus Male Onset of spermatogenesis Gonad development started in February and continued till April ['February', 'April']
Aphanius iberus Female Relative fecundity 1609.76 [For age 1] and 759.07 [for Age 0] 1609.76 thousand eggs/kg
Aphanius iberus Male Maximum GSI value Mean of 0.5 [In April] 0.5 percent
Aphanius iberus Female Age at sexual maturity From April to July, 1+ group specimens (7-12 months old) reproduced. Their offspring (0+ group, 3-4 months) reproduced) from July to September. 9.5 years
Aphanius iberus Male Main spermatogenesis activity March-April ['April', 'March']
Aphanius iberus Female Onset of oogenesis January-February ['February', 'January']
Aphanius iberus Female Intensifying oogenesis activity March-April ['April', 'March']
Aphanius iberus Egg Oocyte diameter Mean egg diameter of 0.7285 for age 1 and 0.8145 for age 0 0.7285 mm
Aphanius iberus Male Spermatogenesis duration From September until January No data
Aphanius iberus Spawning conditions Spawning season May to September ['May', 'September']
Aphanius iberus Female Length at sexual maturity From 2.3 to 2.8 [Females] 2.3 cm
Aphanius iberus Male Length at sexual maturity Between 1.7 to 2.4 [Male] 1.7 cm
Aphanius iberus Female Age at sexual maturity From April to July, 1+ group specimens (7-12 months old) reproduced. Their offspring (0+ group, 3-4 months) reproduced) from July to September. 9.5 year
Aphanius iberus Spawning conditions Spawning release Mutiple spawner No category
Aphanius iberus Spawning conditions Parity This stock contains only three age groups (0+, 1+, and 2 +) of which 0+ group constitutes more than 95% [Very few of the 1+ group specimens survived to spawn the following year] No category