We hypothesize for golden shiners, Notemigonus crysoleucas, raised in split-ponds (SPS), that the waste treatment unit (WTU) would be a zooplankton refuge. To examine this hypothesis, a 6-week study was conducted in six traditional earthen ponds (TEP) and six SPS (each 0.04 ha) stocked with adult golden shiners at 450 kg of fish/ha. Fish were fed a commercial feed at 3% body weight daily in three ponds (FED) of each pond type, while in the remaining ponds fish had access to natural foods only (UNF). Zooplankton samples were collected daily for five consecutive days from three locations in each TEP and from three locations each within the fish culture unit (FCU) and WTU of SPS. Net yield and survival were not significantly different among the treatment groups. Survival was severely impacted by depredation from birds and herpetofauna. Fish in SPS-UNF ponds had lower condition factors, relative weight, whole-body fats, and gonadosomatic index compared to the other treatment groups. Zooplankton number/mL were significantly higher in the TEP (both FED and UNF) when compared to other treatment groups. There was not enough evidence that the WTU being devoid of fish may serve as a refuge for larger zooplankton.

中文翻译：

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评估传统和分池系统中的浮游动物，以提高金光鱼 Notemigonus crysoleucas

我们假设金光闪闪的Notemigonus crysoleucas, 在分裂池 (SPS) 中饲养，废物处理单元 (WTU) 将成为浮游动物避难所。为了检验这一假设，在 6 个传统的土池 (TEP) 和 6 个 SPS（每个 0.04 公顷）中进行了一项为期 6 周的研究，这些池塘以 450 公斤鱼/公顷的速度放养了成鱼。在每种池塘类型的三个池塘 (FED) 中，每天向鱼喂食 3% 体重的商业饲料，而在其余池塘中，鱼只能获得天然食物 (UNF)。浮游动物样本连续五天每天从每个 TEP 的三个位置以及鱼类养殖单元 (FCU) 和 SPS 的 WTU 内的三个位置收集。处理组之间的净产量和存活率没有显着差异。鸟类和爬行动物的掠夺严重影响了生存。SPS-UNF 池塘中的鱼具有较低的条件因子、相对重量、与其他治疗组相比，全身脂肪和性腺指数。与其他治疗组相比，TEP（FED 和 UNF）中的浮游动物数量/mL 显着更高。没有足够的证据表明没有鱼类的 WTU 可以作为大型浮游动物的避难所。