Wild intersex roach (Rutilus rutilus) have reduced fertility.
Jobling S, Coey S, Whitmore JG, Kime DE, Van Look KJ, McAllister BG, Beresford N, Henshaw AC, Brighty G, Tyler CR, Sumpter JP.
Jobling S, et al.
Biol Reprod. 2002 Aug;67(2):515-24. doi: 10.1095/biolreprod67.2.515.
Biol Reprod. 2002.
PMID: 12135890