Wootton et al, 1978


Wootton, R.J. and Evans, G.W. and Mills, L. (1978) Annual cycle in female three-spined stiklebacks (Gasterosteus aculeatus L.) from an upland and lowland pouplation. J. Fish. Biol., pp. 331-342

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Gasterosteus aculeatus Female Length at sexual maturity Lengths of female caught in May anf June: 38.5 ± 1.55 mm and 41.7 mm, respectively in Frongoch and 46.0 ±2.01 mm and 44 ±1.01 mm in Rheidol 38.5 cm
Gasterosteus aculeatus Female Weight at sexual maturity Weights of female caught in May anf June: 0.557 ± 0.0835 g and 0.626 g, respectively in Frongoch and 1.098 ±0.1553 and 0.823 ±0.0525 g in Rheidol 0.56 kg
Gasterosteus aculeatus Female Onset of oogenesis September-October: A period of slow increase over the autumn and the winter ['January', 'February', 'March', 'September', 'October', 'November', 'December']
Gasterosteus aculeatus Female Intensifying oogenesis activity Very rapid increase in the GSI in March and April ['March', 'April']
Gasterosteus aculeatus Female Maximum GSI value Peak in May: Mean of 19%, up to 21 in 1974 and mean of 12.5, up to 15.5 in 1975 19.0 percent
Gasterosteus aculeatus Spawning conditions Spawning period duration This indicates that in 1975, the breeding season in the Rheidol lasted for thrre to four months, but in Frongoch it lasted only about one month 1975.0 weeks