No abstract

Migration and reproduction of the Caspian Lamprey, Caspiomyzon wagneri, in the Shirud River were investigated during late-March to early-May at water temperatures ranging from 11 to 21.25°C. We examined the effect of water temperature on timing of spawning migrations. There was a significant negative relationship between temperature and intensive migration of Caspian Lamprey (p<0.05). The most intensive migration of lampreys was at night (21:00-3:00 h) and when the water temperatures averaged 16°C (34.43%). The overall sex ratio (male to female) was 1.07 to 1. The individual absolute fecundity was 31 '758-51 924±5,382). The egg diameter was 0.780-1.151 (0.92±0.081) mm. The individual relative fecundity varies from 80.3 to 148.1 (107.2± 15.1) eggs per 1 mm of length and from 260.8 to 677.4 (397.6±93) eggs per 1 g of weight. The gonadosomatic index (GSI) of females was 5.83-31.44 (11.22±4.30).

No abstract

No abstract

No abstract