scholarly journals Probiotic characterization and cholesterol assimilation ability of Pichia kudriavzevii isolated from the gut of the edible freshwater snail “Pila globosa”.

2020 ◽  
Vol 24 (7) ◽  
pp. 23-39
Author(s):  
Suyash Kathade ◽  
Mayur Aswani ◽  
Pashmin kaur Anand ◽  
Bipinraj Nirichan
Keyword(s):  
Freshwater Snail ◽  
Pichia Kudriavzevii ◽  
Pila Globosa

Studies on energy transformation in the freshwater snail Pila globosa.

1974 ◽  
Vol 4 (3) ◽  
pp. 275-280 ◽  
Author(s):  
E. VIVEKANANDAN ◽  
M. A. HANIFFA ◽  
T. J. PANDIAN ◽  
R. RAGHURAMAN
Keyword(s):  
Freshwater Snail ◽  
Energy Transformation ◽  
Pila Globosa

scholarly journals Trematode cercariae infections in freshwater snails of Chitwan district, central Nepal

2011 ◽  
Vol 7 (9) ◽  
pp. 9-14 ◽  
Author(s):  
Ramesh Devkota ◽  
Prem Bahadur Budha ◽  
Ranjana Gupta
Keyword(s):  
Freshwater Snail ◽  
Temporary Ponds ◽  
Freshwater Snails ◽  
Snail Species ◽  
Double Infection ◽  
Melanoides Tuberculata ◽  
Central Nepal ◽  
Pila Globosa ◽  
Indoplanorbis Exustus ◽  
Bellamya Bengalensis

Because Nepal has been virtually unexplored with respect to its trematode fauna, we sampled freshwater snails from grazing swamps, lakes, rivers, swamp forests, and temporary ponds in the Chitwan district of central Nepal between July and October 2008. Altogether we screened 1,448 individuals of nine freshwater snail species (Bellamya bengalensis, Gabbia orcula, Gyraulus euphraticus, Indoplanorbis exustus, Lymnaea luteola, Melanoides tuberculata, Pila globosa, Thiara granifera and Thiara lineata) for shedding cercariae. A total of 4.3% (N=62) infected snails were found, distributed among the snail species as follows (B. bengalensis - 1, G. orcula - 11, G. euphraticus - 8, I. exustus - 39, L. luteola - 2 and T. granifera - 1). Collectively, six morphologically distinguishable types of trematode cercariae were found: amphistomes, brevifurcate-apharyngeate (likely mammalian schistosomes), clinostome, gymnocephalus (likely fasciolid), longifurcate-pharyngeate and xiphidiocercaria. I. exustus had the highest prevalence of trematode infection, and harbored all the noted cercarial types except gymnocephalus cercariae. One double infection (xiphidiocercaria and longifurcate-pharyngeate cercaria) was found in this snail. Amphistome cercariae were common in G. euphraticus, G. orcula, and I. exustus. The highest prevalence of infection (38.3%) was recorded among snails collected from temporary ponds.DOI: http://dx.doi.org/10.3126/hjs.v7i9.2183 Himalayan Journal of Sciences Vol.7 Issue 9 2011 pp.9-14

scholarly journals Cryptic speciation in freshwaters: are speciation in lentic species shaped by paleohydrological events?

2021 ◽  
Author(s):  
Maitreya Sil ◽  
Abhishikta Roy ◽  
Tenzin Palden ◽  
Poorna Bhat ◽  
K. Praveen Karanth ◽  
...  
Keyword(s):  
Indian Subcontinent ◽  
Freshwater Snail ◽  
Snail Species ◽  
Cryptic Speciation ◽  
Cryptic Diversity ◽  
Niche Modelling ◽  
Putative Species ◽  
Species Complexes ◽  
Biotic Diversity ◽  
Pila Globosa

The Indian subcontinent is extremely diverse in terms of its flora and fauna. However, there is a severe underestimation of the biotic diversity in invertebrate groups as well as a lack of understanding of the processes generating diversity in these groups. Here we aimed to jointly estimate the cryptic diversity of two freshwater snail species complexes, Pila globosa and Pila virens, and uncover the processes behind the speciation in these groups. We employed phylogenetic, morphometric, population genetic and niche modelling technique to address these questions. We found out that both species complexes consist of several genetically and ecologically distinct putative species. The speciation was primarily driven by allopatric isolation into different river basins. A combination of paleoclimatic and paleohydrological changes during the Miocene have shaped the speciation events. Local climatic adaptation also could have contributed towards some of the speciation events. The study sheds light on the complex interaction between the biology of the species and the environment that shape the diversification patterns in a group.

Overview of river prawn farming in Bangladesh.

2020 ◽  
Author(s):  
Nesar Ahmed
Keyword(s):  
Macrobrachium Rosenbergii ◽  
Stocking Density ◽  
Culture Method ◽  
International Market ◽  
Freshwater Snail ◽  
Paddy Fields ◽  
South West ◽  
Pila Globosa ◽  
Almost All

Abstract In south-west Bangladesh, thousands of farmers have converted their paddy fields into ghers to accommodate profitable river prawn (Macrobrachium rosenbergii) culture, in which prawn is cultured with fish and rice. Prawn post-larvae (PLs) are stocked in May-June and harvested from November to January. Farmers stock wild PLs rather than hatchery-produced stock as production of the latter is limited and farmers consider them to be of lower quality. The average stocking density of PLs is 20,680 ha-1. A variety of feeds is used for prawn culture but the preferred feed is the freshwater snail, Pila globosa. The production of prawn is quite variable because of the simple culture method, averaging 432 kg ha-1 year-1. The prawn is a high-value product for the international market and almost all prawns are therefore exported.

Regeneration of Floodplain Biotopes on the Upper Rhine – The “Polder Altenheim” Case

1994 ◽  
Vol 29 (3) ◽  
pp. 281-288 ◽  
Author(s):  
A. Siepe
Keyword(s):  
Large Scale ◽  
Freshwater Snail ◽  
Red Alga ◽  
Flood Protection ◽  
Flooding Regime ◽  
Theodoxus Fluviatilis ◽  
The Creation ◽  
Early Succession ◽  
Upper Rhine

The floodplain of the Upper Rhine and its biocoenoses have, through different river-regulatory activities over the last 175 years, undergone large scale degradation. At the same time flood protection for the downstream inhabitants has been greatly reduced. For reasons of flood protection, the “Polder Altenheim” in Baden-Württemberg, Germany southwest of Strasbourg, France, with so called retention flooding, was put into operation in 1987. The original floodplain had been diked for the previous 17 years, during which no flooding occurred. Since 1989 “ecological flooding” also is carried out. This has assisted in the regeneration of floodplain biotopes and promoted the floodplain biotic communities and the readaption of the bioceonosis to a regular flooding regime. The creation of new floodplain biotopes of early succession stages, particularly through geomorphodynamic processes, has followed the more than ten flood ocassions and typical biotic communities have colonised these sites. This will be presented together with selected examples of terrestrial and limnical species and communities. The following species and communities will be discussed: kingfisher Alcedo atthis, carabid communities (Coleoptera), the red alga Hildenbrandia rivularis (Rhodophyceae), the freshwater snail Theodoxus fluviatilis (Neritacea) and the freshwater bug Aphelocheirus aestivalis (Hydrocorisae).

scholarly journals Isolation and Characterization of Yeasts from Rumen Fluids for Potential Use as Additives in Ruminant Feeding

2021 ◽  
Vol 8 (3) ◽  
pp. 52
Author(s):  
Chanon Suntara ◽  
Anusorn Cherdthong ◽  
Metha Wanapat ◽  
Suthipong Uriyapongson ◽  
Vichai Leelavatcharamas ◽  
...  
Keyword(s):  
Incubation Time ◽  
Cellulase Activity ◽  
The Other ◽  
Pichia Kudriavzevii ◽  
Factor B ◽  
Yeast Strains ◽  
Randomized Design ◽  
Holstein Friesian ◽  
The Media ◽  
Completely Randomized Design

Saccharomyces cerevisiae is a yeast strain often used to improve the feed quality of ruminants. However, S. cerevisiae has limited capacity to provide biomass when inoculated with carbon sources and a low ability to produce cellulase enzymes. Here, we hypothesized that yeast in the rumen produces a large amount of biomass and could release cellulase enzymes to break down fiber content. Therefore, the aim of this study was to screen, isolate and identify yeast from the rumen fluids of Holstein Friesian steers and measure the efficiency of biomass production and cellulase activity. A fermentation medium containing sugarcane molasses as a carbon source and urea as a nitrogen source was optimized. Two fistulated–crossbred Holstein Friesian steers averaging 350 ± 20 kg body weight were used to screen and isolate the ruminal yeast. Two experiments were designed: First, a 12 × 3 × 3 factorial was used in a completely randomized design to determine biomass and carboxymethyl cellulase activity. Factor A was the isolated yeast and S. cerevisiae. Factor B was sugarcane molasses (M) concentration. Factor C was urea (U) concentration. In the second experiment, potential yeasts were selected, identified, and analyzed for 7 × 4 factorial use in a completely randomized design. Factor A was the incubation times. Factor B was the isolated yeast strains, including codes H-Khon Kaen University (KKU) 20 (as P. kudriavzevii-KKU20), I-KKU20 (C. tropicalis-KKU20), and C-KKU20 (as Galactomyces sp.-KKU20). Isolation was imposed under aerobic conditions, resulting in a total of 11 different colonies. Two appearances of colonies including asymmetric colonies of isolated yeast (indicated as A, B, C, E, and J) and ovoid colonies (coded as D, F, G, H, I, and K) were noted. Isolated yeast from the rumen capable of providing a high amount of biomass when inoculant consisted of the molasses 15% + urea 3% (M15 + U3), molasses 25% + urea 1% (M25 + U1), molasses 25% + urea 3% (M25 + U3), and molasses 25% + urea 5% (M25 + U5) when compared to the other media solution (p < 0.01). In addition, 11 isolated biomass-producing yeasts were found in the media solution of M25 + U1. There were 4 isolates cellulase producing yeasts discovered in the media solution of M25 + U1 and M25 + U5 whereas molasses 5% + urea 1% (M5 + U1), molasses 5% + urea 3% (M5 + U3), molasses 5% + urea 5% (M5 + U5), molasses 15% + urea 1% (M15 + U1), molasses 15% + urea 3% (M5 + U3), and M25 + U3 were found with 2, 3, 1, 2, 1, and 2 isolates, respectively. Ruminal yeast strains H-KKU20, I-KKU20, and C-KKU20 were selected for their ability to produce biomass. Identification of isolates H-KKU20 and I-KKU20 revealed that those isolates belonged to Pichia kudriavzevii-KKU20 and Candida tropicalis-KKU20 while C-KKU20 was identified as Galactomyces sp.-KKU20. Two strains provided maximum cell growth: P. kudriavzevii-KKU20 (9.78 and 10.02 Log cell/mL) and C. tropicalis-KKU20 (9.53 and 9.6 Log cells/mL) at 60 and 72 h of incubation time, respectively. The highest ethanol production was observed in S. cerevisiae at 76.4, 77.8, 78.5, and 78.6 g/L at 36, 48, 60, and 72 h of incubation time, respectively (p < 0.01). The P. kudriavzevii-KKU20 yielded the least reducing sugar at about 30.6 and 29.8 g/L at 60 and 72 h of incubation time, respectively. The screening and isolation of yeasts from rumen fluids resulted in 11 different yeasts being obtained. The potential yeasts discovered in the rumen fluid of cattle were Pichia kudriavzevii-KKU20, Candida tropicalis-KKU20, and Galactomyces sp.-KKU20. P. kudriavzevii-KKU20 had higher results than the other yeasts in terms of biomass production, cellulase enzyme activity, and cell number.

scholarly journals Comparison of Invasive Apple Snail (Pomacea canaliculata) Behaviors in Different Water Temperature Gradients

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1149
Author(s):  
Mi-Jung Bae ◽  
Eui-Jin Kim ◽  
Young-Seuk Park
Keyword(s):  
Water Temperature ◽  
Farming Systems ◽  
Freshwater Snail ◽  
Freshwater Ecosystems ◽  
Pomacea Canaliculata ◽  
Activity Levels ◽  
Self Organizing Map ◽  
Apple Snail ◽  
Temperature Changes ◽  
Organic Farming Systems

Pomacea canaliculata (known as invasive apple snail) is a freshwater snail native to South America that was introduced into many countries (including Asia and North America) as a food source or for organic farming systems. However, it has invaded freshwater ecosystems and become a serious agricultural pest in paddy fields. Water temperature is an important factor determining behavior and successful establishment in new areas. We examined the behavioral responses of P. canaliculata with water temperature changes from 25 °C to 30 °C, 20 °C, and 15 °C by quantifying changes in nine behaviors. At the acclimated temperature (25 °C), the mobility of P. canaliculata was low during the day, but high at night. Clinging behavior increased as the water temperature decreased from 25 °C to 20 °C or 15 °C. Conversely, ventilation and food consumption increased when the water temperature increased from 25 °C to 30 °C. A self-organizing map (an unsupervised artificial neural network) was used to classify the behavioral patterns into seven clusters at different water temperatures. These results suggest that the activity levels or certain behaviors of P. canaliculata vary with the water temperature conditions. Understanding the thermal biology of P. canaliculata may be crucial for managing this invasive snail.

Sign in / Sign up

Export Citation Format

Share Document