ABSTRACT: Periphyton-based aquaculture can reduce feed input costs. Here we characterised the periphyton and bioseston formation in aqua dams stocked with net, plastic, and stone substrates. The consumption of periphyton and bioseston from the net substrate by Mozambique tilapia Oreochromis mossambicus fingerlings was evaluated. Three experiments were conducted. In the first experiment, net, stone, and plastic were deployed in triplicates in aqua dams. The net substrate registered the highest (7.74 ± 1.45 g m^-2, ±SE) periphyton biomass. Network analysis showed connectedness between the substrates. The degree centrality showed that the net substrate had the highest score, indicating that there were more groups of species with similar functions growing on the net substrate. The net substrate was subsequently used in the second experiment to determine the consumption of periphyton and bioseston by tilapia fingerlings in aqua dams. Three treatments were assigned: N100 (fish fed 100% commercial diet); N50 (fish fed 50% commercial diet); and N33 (fish fed 33% commercial diet). Growth performance did not differ significantly among the treatments, although N50 showed a trend for a higher growth. This suggests that periphyton may be capable of nutritionally compensating for the partial withdrawal of commercial feed. A third experiment was conducted in fibreglass tanks to determine the preference of tilapia between periphyton and bioseston. The prominent values showed that tilapia preferred to feed on bioseston. The best growth performance was achieved in a periphyton-based aquaculture system, and deployment of the net substrate is recommended in tilapia ponds.

中文翻译：

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莫桑比克罗非鱼在三种不同基质的水坝中对附生生物和生物素的消耗

摘要：以附生生物为基础的水产养殖可以降低饲料投入成本。在这里，我们描述了装有网、塑料和石头基质的水坝中的附生生物和生物环的形成。评估了莫桑比克罗非鱼Oreochromis mossambicus鱼种对净底物的附生生物和生物烯的消耗。进行了三个实验。在第一个实验中，在水坝中一式三份地部署了网、石头和塑料。净底物的附生生物量最高（7.74 ± 1.45 gm ^-2 , ±SE）。网络分析显示了基质之间的连通性。度中心性表明，网状基质得分最高，表明网状基质上生长着更多具有相似功能的物种类群。随后在第二个实验中使用网底物来确定水坝中罗非鱼鱼种对附生生物和生物烯的消耗。分配了三种处理：N100（鱼饲喂 100% 商业饲料）；N50（用 50% 商业饲料喂养的鱼）；和 N33（用 33% 商业饲料喂养的鱼）。尽管 N50 显示出较高生长的趋势，但各处理之间的生长性能没有显着差异。这表明附生生物可能能够对商业饲料的部分撤出进行营养补偿。第三个实验是在玻璃纤维池中进行的，以确定罗非鱼对附生生物和生物素的偏好。显着值表明罗非鱼更喜欢以生物烯酮为食。基于附生生物的水产养殖系统实现了最佳生长性能，建议在罗非鱼池塘中部署网状基质。