Martin, 1975


Martin, R.G. (1975) Sexual and aggressive behaviour, density and social structure in a natural population of mosquitofish, Gambusia affinis holbrooki. Copeia, pp. 445-453

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Gambusia affinis Male Male sexual dimorphism The anal fin of the adult male is modified into a long and slender intromittent organ, the gonopodium, which the male can extend at various angles and directions from the body Absent
Gambusia affinis Spawning conditions Spawning period duration Total sexual acts peaked on 8 June; howeevr increased numbers of males caused the mean sexual acts per male to be less than on 14 April, the date of maxima sexual activity. In mid and late summer, density, individual sexual acts, and mean male sexual acts all decreased: 28 July was the only date on which females outnumbered males [Other sutdies: the reproductive period in females mosquitofish varied from 8 to 15 weeks in Illinois during July through October, while others reported that "waves" of yound apperared from June to October in their Long Island study area.] 8.0 weeks