Postgraduate Program of Environment and Sustainable Technologies, Federal University of Fronteira Sul, Cerro Largo, Brazil.
Núcleo de Estudos Ambientais (Neamb), Federal University of Tocantins, Porto Nacional, Brazil.
J Fish Biol. 2020 Oct;97(4):1233-1237. doi: 10.1111/jfb.14459. Epub 2020 Aug 23.
The spotted surubim Pseudoplatystoma corruscans is a large migratory catfish native to the La Plata and San Francisco basins. Nonetheless, its reproductive dynamics and behaviour remain poorly understood. This brief note provides the first record of the mating behaviour of P. corruscans in natural conditions. This behaviour was observed in the main channel of the Middle Uruguay River (Brazil). A school of approximately 25 fish, 5 females (with protruding abdomen and larger body size) and 20 males, were followed and videotaped. The largest female led the school, followed by other fish. Some males disputed repeatedly the posterior region of the females, whereas other males continuously repelled them. Eventually, some males, apparently exhausted, floated belly up. During this event, males were in a state of pronounced agitation, and some had abrasions in the head. Polygamy characterized the mating behaviour of P. corruscans.
斑点原无须魮 Pseudoplatystoma corruscans 是一种大型洄游性鲶鱼，原产于拉普拉塔和圣弗朗西斯科盆地。尽管如此，其繁殖动态和行为仍知之甚少。本简要说明提供了斑点原无须魮在自然条件下交配行为的首次记录。这种行为是在乌拉圭河中游（巴西）的主河道中观察到的。一群大约 25 条鱼，5 条雌性（腹部突出，体型较大）和 20 条雄性，被跟踪并拍摄了视频。最大的雌性带领着鱼群，后面跟着其他鱼。一些雄性反复争夺雌性的后区，而其他雄性则不断驱赶它们。最终，一些雄性显然筋疲力尽，肚皮朝上漂浮着。在这个过程中，雄性处于明显的激动状态，有些雄性的头部有擦伤。多配偶制是斑点原无须魮交配行为的特征。
