Diadromous macrocrustaceans need connectivity between the ocean, estuary and river to complete their life cycle. Instream barriers in lower reaches of rivers threaten upstream migrations of diadromous macrocrustaceans. Varuna litterata migrate upstream after a spawning event out at sea. These migration events have been poorly documented. We documented the presence V. litterata and Macrobrachium spp. at a vertical slot fishway and a rock ramp on the Lower Thukela River Bulk Water Supply Scheme Weir, KwaZulu-Natal, South Africa, during 2021–2022. We found Macrobrachium spp. and V. litterata made use of the rock ramp. However, the vertical slot fishway did hinder the migration of V. litterata significantly, as found in other studies.

中文翻译：

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水生大型甲壳类动物越过南非乌图克拉河人工屏障的迁徙

产卵大型甲壳类动物需要海洋、河口和河流之间的连通才能完成它们的生命周期。河流下游的河内屏障威胁着大型甲壳类动物向上游的迁徙。Varuna litterata在海上产卵后向上游迁徙。这些迁徙事件的记录很少。我们记录了V. litterata和Macrobrachium spp的存在。2021 年至 2022 年期间，南非夸祖鲁-纳塔尔省下图克拉河批量供水计划堰的垂直槽鱼道和岩石坡道。我们发现了沼虾属。V. litterata利用了岩石坡道。然而，正如其他研究发现的那样，垂直槽鱼道确实显着阻碍了V. litterata的迁移。