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7 results for “rearing density”
Cultivation of the seaweed Ulva spp. with effluent from a shrimp biofloc rearing system: different species and stocking density
<p>This work evaluated the use of effluent from a marine shrimp biofloc rearing system to cultivate the green seaweed <em>Ulva</em>. First, the growth of two <em>Ulva </em>species, <em>U. ohnoi</em> and <em>U. fasciata,</em> was evaluated. Second, the best-performing species was cultivated under two different stocking densities (2 g L<sup>-1</sup> and 4 g L<sup>-1</sup>) to evaluate both growth and nutrient uptake rates, considering total ammonia nitrogen, nitrate, and orthophosphate. In both cases, environmental variables were monitored, and the cultivation medium, consisting of 25% biofloc water and 75% seawater, was exchanged weekly. <em>U. ohnoi</em> grew significantly better, considering all variables evaluated (<em>p</em><0.05). The smaller stocking density produced a higher specific growth rate (<em>p</em><0.05). Yield, however, was unaffected (<em>p</em>≥0.05). No significant differences in the nutrient uptake rates were observed (<em>p</em>≥0.05). Overall, this work highlights the importance of species selection for seaweed destined for aquaculture. Additionally, it also optimizes the cultivation of seaweeds, specifically <em>U. ohnoi</em>, using effluent from biofloc systems.</p>
Fig. 2 in Rearing protocol and density trials of the brown marmorated stink bug (Hemiptera: Pentatomidae) in the laboratory
Fig. 2. Mean (± SD) number of egg masses laid per female at densities of 1:1, 2:2, and 5:5 (female to male) per cage and mean (± SD) survival of females from first egg mass laid at densities of 1:1, 2:2, and 5:5 per cage
Fig. 1. Bug dorms. A in Rearing protocol and density trials of the brown marmorated stink bug (Hemiptera: Pentatomidae) in the laboratory
Fig. 1. Bug dorms. A. The large cage can house up to 12 bug dorms, with each stack containing 3 dorms. B. The large insect cage with humidifier attached. C. Stacks of Petri dishes. D. Humidifier.
Data from: An evaluation of rearing densities to improve growth and survival of hatchery spring Chinook salmon
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Data from: Does phenotypic plasticity for adult size versus food level in Drosophila melanogaster evolve in response to adaptation to different rearing densities?
Recent studies using inbred lines of Drosophila have suggested that there is extensive genetic variability for phenotypic plasticity of body size versus food level. If true, we expect that the outcome of evolution at very different food levels should yield genotypes whose adult sizes show different patterns of phenotypic plasticity. We have tested this prediction with six independent populations of Drosophila melanogaster kept at extreme (low vs. high) densities for 125 generations. We found that the phenotypic plasticity of body size versus food level is not affected by selection or the presence of competitors of a different genotype. However, we document increasing among population variation in phenotypic plasticity due to random genetic drift. Several reasons are explored to explain these results including the possibility that the use of highly inbred lines to make inferences about the evolution of genetically variable populations may be misleading.
Data from: Does phenotypic plasticity for adult size versus food level in Drosophila melanogaster evolve in response to adaptation to different rearing densities?
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Exploring the effects of rearing densities on epigenetic modifications in the zebrafish gonads
GEO Series GSE134646. Danio rerio. 40 samples. Type: Methylation profiling by high throughput sequencing.
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