Aspects of the reproductive biology of torrentfish, Cheimarrichthys fosteri, in two braided rivers of Canterbury, New Zealand

摘要: Abstract The reproductive biology of torrentfish, Cheimarrichthys fosteri Haast, was investigated in the braided Rakaia and Ashley Rivers, South Island, New Zealand. Fish matured their second year (1+) with males exceeding 63 mm females 65 fork length (FL). Few fish lived for more than 3 years. Spawning is thought to take place lower reaches rivers occurred both from January April. Gonosomatic index (GI) values were lowest April August, inclusive, rivers; they peaked October River. Male GI during April‐July highest March respectively. Fecundity varied 2769 55100 eggs linearly related length. Juveniles (0+), 23–30 FL, entered lagoon primarily September. Females dispersed up stream, 90 km sea, whereas most abundant reaches. Th...