No detailed citation.
|Species||Development state||Trait||Primary Data||Secondary Data|
|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|
|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||Female||Onset of oogenesis||September-October: A period of slow increase over the autumn and the winter||['March', 'January', 'September', 'December', 'February', 'October', 'November']|
|Gasterosteus aculeatus||Female||Intensifying oogenesis activity||Very rapid increase in the GSI in March and April||['April', 'March']|
|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||0.557 kg|
|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|