Itzkowitz M, Draud M J
Behavioral and Evolutionary Biosciences, Lehigh University, Bethlehem, Pennsylvania, USA.
Behav Processes. 1992 Dec;28(1-2):59-64. doi: 10.1016/0376-6357(92)90049-J.
In aquaria, monogamous Texas cichlid fish (Cichlasoma cyanoguttatum) formed reproductive pairs significantly more often when another conspecific male (termed 'intruder') was visible behind a plexiglass partition. Without an intruder present, males often violently attacked and injured the female. Larger females, although attacked more frequently, were less prone to severe injuries. Pairs did not form when females were larger than males, irrespective of the presence of an intruder.
在水族箱中，实行一夫一妻制的德州丽鱼（Cichlasoma cyanoguttatum）在有机玻璃隔板后有另一只同种雄性（称为“入侵者”）可见时，显著更频繁地形成繁殖对。没有入侵者在场时，雄性常常会猛烈攻击并伤害雌性。体型较大的雌性虽然被攻击得更频繁，但不太容易受到重伤。当雌性比雄性大时，无论是否有入侵者，都不会形成配对。
