P. Poncin, FIELD OBSERVATIONS ON A MATING ATTEMPT OF A SPAWNING GRAYLING, THYMALLUS-THYMALLUS WITH A FEEDING BARBEL, BARBUS-BARBUS, Journal of Fish Biology, 45(5), 1994, pp. 904-906
During the spawning period of the grayling, one male was sexually stim
ulated by a feeding barbel and consequently exhibited the behavioural
pattern of 'approach', 'quivering' and 'dorsal fin clasping'.