Alp, 2004



Citation


No detailed citation.

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Silurus glanis Spawning conditions Parental care The eggs are guarded by the males until they hatch Male parental care
Silurus glanis Spawning conditions Spawning site preparation The male opens out a depression in the bottom No category
Silurus glanis Female Maximum GSI value 4.5% [May] 4.5 percent
Ictalurus punctatus Male Male sexual dimorphism Males were 18 to 43% heavier than females Absent
Silurus glanis Male Male sexual dimorphism Males grew 2 to 15% faster than females Absent
Silurus glanis Egg Egg adhesiveness The eggs are laid in a large sticky pile Adhesive
Silurus glanis Male Onset of spermatogenesis December ['December']
Silurus glanis Female Oogenesis duration From December to May No data
Silurus glanis Female Relative fecundity 8.443 +/ 1.114 [12,7 in other studies] 8.443 thousand eggs/kg
Silurus glanis Male Maximum GSI value 0.2 [May] 0.2 percent
Silurus glanis Female Age at sexual maturity Smallest males belonged at 3 years old [2-3 in other studies] 2.5 years
Silurus glanis Female Resting period September-October: >0.05% 0.05 months
Silurus glanis Male Main spermatogenesis activity March-April and May ['April', 'March', 'May']
Silurus glanis Male Resting period Low between August and November No data
Silurus glanis Egg Oocyte diameter Mean size of oocytes range from 1.842 [Range 1.00-2.67] for female of 4 years old to 2.323 [Range 1.45-3.73, for females of age 10] 1.835 mm
Silurus glanis Female Absolute fecundity Mean fecundity 87,108 +/ 20,992 [Range 9,033 to 340,461 for females ranging from 86.0 to 151.0 cm] 87.0 thousand eggs
Silurus glanis Spawning conditions Spawning season June to August ['August', 'June']
Silurus glanis Female Weight at sexual maturity The smallest mature female was 4.434 [1-2, 1.43 for both sex in other studies] 1.5 kg
Silurus glanis Female Length at sexual maturity The smallest mature female was 86.0 cm [85.0-90.0 cm], also [58-60 for both sex in other studies] 87.5 cm
Silurus glanis Male Length at sexual maturity Smallest males belonged to the 80-85 cm length class [the smallest male was 83.0 cm], also [58-60 both sex, other studies] 82.5 cm
Silurus glanis Male Weight at sexual maturity The smallest male was 3.744 [12, 1.43 for both sex in other studies] 3.744 kg
Silurus glanis Female Age at sexual maturity The smallest mature female was 4 years old [3-4 for females in other sutides] 3.5 year