Biology Centre AS CR v.v.i., Institute of Hydrobiology, České Budějovice, Czech Republic.
J Fish Biol. 2013 Nov;83(5):1444-52. doi: 10.1111/jfb.12229.
Late summer sampling of pelagic age-0 year fish communities in five Czech reservoirs and one Dutch reservoir revealed extremely small age-0 year pikeperch Sander lucioperca (mean 24 mm standard length, LS , minimum 13 mm LS ) alongside more normal-sized S. lucioperca that are found at the end of the first growing season (mean 50 mm LS ), resulting in two clearly size-separated cohorts. Reference to such small age-0 year S. lucioperca in lakes or reservoirs at this time of year and in such large numbers are almost absent the scientific literature, and the presence of these small S. lucioperca is contradictory to the common understanding of the reproductive biology of this species. This overlooked phenomenon may have a major effect on the population dynamics of this valuable species because of size-dependent winter mortality.
夏末对捷克的五个水库和一个荷兰水库的洄游性 0 龄鱼群落进行采样，结果发现，那里的尖吻鲈（Sander lucioperca）数量特别多，平均体长 24 毫米（标准体长 LS ），最小 13 毫米 LS ，而且都是当年刚孵化的幼鱼，此外还发现了一些正常大小的 0 龄鱼，这是它们在第一个生长季末的体长（平均 50 毫米 LS ），这表明有两个明显大小分隔的群体。这种当年孵化的小尖吻鲈在这个时节、如此大规模地出现在湖泊或水库中，在科学文献中几乎没有记载，而且这些小尖吻鲈的存在与人们对该物种生殖生物学的普遍认识相矛盾。这种被忽视的现象可能会对该物种的种群动态产生重大影响，因为它们的冬季死亡率与体型大小相关。
