Influence of light, water motion, and stocking density on the growth and pigment content of Halymenia durvillei (Rhodophyceae) under laboratory conditions

2021 ◽  
Author(s):  
Najeen Arabelle M. Rula ◽  
Edna T. Ganzon-Fortes ◽  
Ma. Josefa R. Pante ◽  
Gavino C. Trono
Keyword(s):  
Stocking Density ◽  
Pigment Content ◽  
Light Water ◽  
Water Motion ◽  
Laboratory Conditions

Coral farming: effects of light, water motion and artificial foods

2011 ◽  
Vol 92 (4) ◽  
pp. 721-729 ◽  
Author(s):  
Zac H. Forsman ◽  
Bethany K. Kimokeo ◽  
Christopher E. Bird ◽  
Cynthia L. Hunter ◽  
Robert J. Toonen
Keyword(s):  
Low Cost ◽  
Optimal Growth ◽  
Growth Conditions ◽  
Low Flow ◽  
Constant Flow ◽  
Pocillopora Damicornis ◽  
Growth And Survival ◽  
Light Water ◽  
Reef Restoration ◽  
Water Motion

Improved coral cultivation will facilitate the reduction of wild harvesting, reef restoration, preservation of biodiversity, and the use of corals as model experimental organisms. In this study, we examine species-specific responses in growth and survival of corals from the effects of light, water motion and artificial (i.e. non-living aquarium trade) food supplements. Three species representing distinct, diverse and abundant coral genera were chosen (Montipora capitata(Mc), Porites compressa (Pc) and Pocillopora damicornis (Pd)) for three experiments to examine: (1) the interaction of water flow and light on growth and survival of Mc and Pc; (2) the effects of artificial foods on Mc, Pc and Pd; and (3) the effects of increasing dosage of artificial foods in an open system on Mc and Pc. Pc thrived at the highest light levels with low flow, while Mc exhibited bleaching and reduced growth in the same conditions and grew best in shaded treatments. High constant flow (~11 cm s-1) resulted in slightly less overall growth than low constant flow (~4 cm s-1). Some artificial foods resulted in a significant increase in growth in Mc and Pd, but not in Pc. These combined results suggest that Mc may be more heterotrophic than Pc. This study illustrates that each species has unique requirements for optimal growth conditions that can be determined by relatively simple and low cost experiments, but that ideal conditions for one species might not be generalized to others.

scholarly journals Preference for microhabitat by Monogenea on the gills of the south american catfish Rhamdia quelen at different stocking densities under laboratory conditions

2016 ◽  
Vol 53 (1) ◽  
pp. 55-61 ◽  
Author(s):  
J. A. Debortoli ◽  
A. C. F. Lacerda ◽  
T. R. Lisboa ◽  
M. L. Martins
Keyword(s):  
Parasitic Infection ◽  
Stocking Density ◽  
Abundant Species ◽  
South American ◽  
Dorsal Region ◽  
The South ◽  
Microhabitat Preference ◽  
Laboratory Conditions ◽  
Rhamdia Quelen

SummaryThis study aimed to verify preferences for microhabitat by the monogeneans on the gills of the south american catfish, Rhamdia quelen (Quoy & Gaimard, 1824), at different stocking densities under controlled laboratory conditions. Three stocking densities were used: 14, 28 and 42 fish per tank (50 L) and the fish were sampled initially, at day 5 and 10 of the experiment. Aphanoblastella mastigatus (Suriano, 1986) was noted as the most abundant species at all stocking densities, except for the initial collection day. The gill arches I and II were the most parasitized, showing the highest mean abundance in the dorsal region, at the highest density. The pattern of microhabitat preference of A. mastigatus for outer regions of the gills of the host was independent of the stocking density and collection day. Higher prevalence and abundance of Scleroductus sp. at the initial collection reflected the parasitic infection of the fish at the farm from where the fish were taken. The abundance of Scleroductus sp. decreased along the experiment, and no preference for gill arches was recorded for the species, probably due to the low abundance of this parasite on the gills.

Human drug taking under controlled laboratory conditions.

1988 ◽  
Author(s):  
Marian W. Fischman ◽  
Richard W. Foltin ◽  
Joseph V. Brady
Keyword(s):  
Laboratory Conditions

Multiple recycling of paperboard: Paperboard characteristics and maximum number of recycling cycles— Part I: Multiple recycling of corrugated base paper

TAPPI Journal ◽  
2019 ◽  
Vol 18 (11) ◽  
pp. 631-638
Author(s):  
FREDERIC KREPLIN ◽  
HANS-JOACHIM PUTZ ◽  
SAMUEL SCHABEL
Keyword(s):  
Compression Test ◽  
Production Capacity ◽  
Strength Properties ◽  
Paper Properties ◽  
Corrugated Board ◽  
Laboratory Conditions ◽  
Base Paper ◽  
Study Results ◽  
Short Span ◽  
Multiple Recycling

Paper for recycling is an important fiber source for the production of corrugated base paper. The change in production capacity toward more and more packaging papers affects the composition of paper for recycling and influences the paper quality. This research project investigated the influence of the multiple recycling of five different corrugated base papers (kraftliner, neutral sulfite semichemical [NSSC] fluting, corrugating medium, testliner 2, and testliner 3) on suspension and strength properties under laboratory conditions. The corrugated board base papers were repulped in a low consistency pulper and processed into Rapid-Köthen laboratory sheets. The sheets were then recycled up to 15 times in the same process. In each cycle, the suspension and the paper properties were recorded. In particular, the focus was on corrugated board-specific parameters, such as short-span compression test, ring crush test, corrugating medium test, and burst. The study results indicate how multiple recycling under laboratory conditions affects fiber and paper properties.

Mechanoactivation Of Rice Husk Ash In Laboratory Conditions

2019 ◽  
pp. 20-26
Keyword(s):  
Mechanical Activation ◽  
Rice Husk ◽  
Amorphous Silica ◽  
Silicon Oxide ◽  
Rice Husk Ash ◽  
Pozzolanic Activity ◽  
Maximum Solubility ◽  
Laboratory Conditions ◽  
Before And After ◽  
Mineral Additive

In many rice producing countries of the world, including in Vietnam, various research aimed at using rice husk ash (RHA) as a finely dispersed active mineral additive in cements, concrete and mortars are being conducted. The effect of the duration of the mechanoactivation of the RHA, produced under laboratory conditions in Vietnam, on its pozzolanic activity were investigated in this study. The composition of ash was investigated by laser granulometry and the values of indicators characterizing the dispersion of its particles before and after mechanical activation were established. The content of soluble amorphous silicon oxide in rice husk ash samples was determined by photocolorimetric analysis. The pizzolanic activity of the RHA, fly ash and the silica fume was also compared according to the method of absorption of the solution of the active mineral additive. It is established that the duration of the mechanical activation of rice husk ash by grinding in a vibratory mill is optimal for increasing its pozzolanic activity, since it simultaneously results in the production of the most dispersed ash particles with the highest specific surface area and maximum solubility of the amorphous silica contained in it. Longer grinding does not lead to further reduction in the size of ash particles, which can be explained by their aggregation, and also reduces the solubility of amorphous silica in an aqueous alkaline medium.

Sign in / Sign up

Export Citation Format

Share Document