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138 results for “Clarias”
Florida Coastal Everglades site, station Taylor Slough Trexler Site MDE, study of animal biomass of Clarias batrachus in units of gramsPerSquareMeter on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Florida Coastal Everglades (FCE) contains animal biomass of Clarias batrachus measurements in gramsPerSquareMeter units and were aggregated to a yearly timescale.
Florida Coastal Everglades site, station Taylor Slough Trexler Site TSB, study of animal biomass of Clarias batrachus in units of gramsPerSquareMeter on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Florida Coastal Everglades (FCE) contains animal biomass of Clarias batrachus measurements in gramsPerSquareMeter units and were aggregated to a yearly timescale.
Florida Coastal Everglades site, station Unknown site at Florida Coastal Everglades LTER, study of animal abundance of Clarias batrachus in units of numberPerEffort on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Florida Coastal Everglades (FCE) contains animal abundance of Clarias batrachus measurements in numberPerEffort units and were aggregated to a yearly timescale.
Florida Coastal Everglades site, station Unknown site at Florida Coastal Everglades LTER, study of animal density of Clarias batrachus in units of numberPerMeterSquared on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Florida Coastal Everglades (FCE) contains animal density of Clarias batrachus measurements in numberPerMeterSquared units and were aggregated to a yearly timescale.
An investigation of ZZ/ZW and XX/XY sex determination systems in North African catfish (Clarias gariepinus)
<p class="CxSpFirst">Sex-specific loci are powerful tools for identifying sex determination systems. They offer a molecular biotechnological approach for producing all‐male or all-female fish for commercial breeding. The North African catfish has been widely adopted for aquaculture, because its superior growth and disease resistance render the species suitable for hybridization with other catfish, to improve the productivity and quality of fish meat. North African catfish have either a ZZ/ZW or XX/XY sex determination system. Here, we investigate and characterize these systems using high-throughput genome complexity reduction sequencing. This approach was effective for identifying sex-specific loci with both single-nucleotide polymorphisms (SNPs) and restriction fragment presence/absence (PA) markers in 30 phenotypic sex assignments of North African catfish. In total, 41 male-linked loci met the criteria of moderately sex-linked loci (70:30, male:female; 80:20, male:female). By contrast, only 25 female-linked loci were detected from moderately sex-linked loci, and no perfectly male- or female-specific sex-linked loci were observed. Several male-linked loci were partially homologous to transposable element and functional genes, and most also showed partial homology with several amniote sex chromosomal linkages. This suggests that an ancestral amniote super-sex chromosome with overlaps of partial sex chromosomal linkages was also found in teleosts, and that the male heterogametic XX/XY sex determination system should exist in North African catfish. The putative Y chromosome is young and the non-recombination region is highly cryptic. In addition, the ZW type of North African catfish exhibits heteromorphic sex chromosomes, whereas the two other groups of North African catfish have different sex determination systems. Thus, turnover of sex chromosome systems might have occurred stochastically in ancestral homomorphic sex chromosomes. The XY group has been introduced into Thailand for commercial breeding. This approach using sex-specific loci provides a solid baseline for revealing sex determination mechanisms and identify potential sex determination regions in catfish, allowing further investigation of genetic improvements in breeding programs.</p>
FIGURE 2 in Clarias gracilentus, a new walking catfish (Teleostei: Clariidae) from Vietnam and Cambodia
FIGURE 2. Map of southeastern Cambodia and Phu Quoc Island, showing collecting localities of the type series of Clarias gracilentus.
FIGURE 1 in Clarias gracilentus, a new walking catfish (Teleostei: Clariidae) from Vietnam and Cambodia
FIGURE 1. Clarias gracilentus, holotype, UMMZ 248862, 189.6 mm SL; Vietnam: Phu Quoc Island. Dorsal, lateral and ventral views.
FIGURE 1 in Clarias serniosus, a new walking catfish (Teleostei: Clariidae) from Laos
FIGURE 1. Clarias serniosus, holotype, MHNG 2745.072, 141 mm SL; Laos: Bolavens Plateau, Xe Pian drainage. Dorsal and lateral views.
An investigation of ZZ/ZW and XX/XY sex determination systems in North African catfish (Clarias gariepinus)
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Figure 11 from: Sabry DA, El-Badry D (2020) Altered retina and cornea of Clarias gariepinus (Siluriformes: Clariidae) under the effect of bright and dim lights. Zoologia 37: 1-11. https://doi.org/10.3897/zoologia.37.e51603
Figure 11 Mean thickness of the different retinal layers in Clarias gariepinus. Each column represents the mean value ± SD (n = 7); * significant at p < 0.05. (NL) Normal light, (BL) bright light, (DL) dim light, (GCL) ganglion cell layer, (IPL) inner plexiform layer, (INL) inner nuclear layer, (OPL) outer plexiform layer, (ONL) outer nuclear layer, (PR) photoreceptors, (PE) pigmented epithelium.
Figures 1-5 from: Sabry DA, El-Badry D (2020) Altered retina and cornea of Clarias gariepinus (Siluriformes: Clariidae) under the effect of bright and dim lights. Zoologia 37: 1-11. https://doi.org/10.3897/zoologia.37.e51603
Figures 1-5 Photomicrograph of sagittal histological sections of cornea of Clarias gariepinus: (1) control showing normal stratified epithelium, Bowman's layer, heavily nucleated stroma, Descemet's membrane and endothelium;(2–3) bright light exposed group showing damaged epithelium and fragility of stroma; (4–5) dim light exposed group showing less improved stroma. Arrow head refer to vacuolization. Arrow refers to pyknosis. Crossed arrow refers to epithelial cell loss. Star refers to stromal edema. (Ep) Epithelium, (BM) Bowman's membrane, (St) stroma, (DM) Descemet's membrane, (E) endothelium, (NL) normal light, (BL) bright light, (DL) dim light.
Figures 7-10 from: Sabry DA, El-Badry D (2020) Altered retina and cornea of Clarias gariepinus (Siluriformes: Clariidae) under the effect of bright and dim lights. Zoologia 37: 1-11. https://doi.org/10.3897/zoologia.37.e51603
Figures 7-10 Photomicrograph of sagittal histological sections of retina of Clarias gariepinus, showing ganglion cell layer, inner and outer plexiform layer, inner and outer nuclear layer, photoreceptor layer: (7) normal light showing ordinary retinal structure; (8–9) exposure to bright light showing damaged photoreceptor and increased infiltration of dark-brown pigments; (10) dim light exposure showing regenerated photoreceptors layer and less dense nerve fibers in the outer plexiform layer and outer nuclear layers. (GCL) Ganglion cell layer, (IPL) inner plexiform layer, (INL) inner nuclear layer, (OPL) outer plexiform layer, (ONL) outer nuclear layer, (PHR) photoreceptors, (PE) pigmented epithelium, (NL) normal light, (BL) bright light, (DL) dim light.
Figure 6 from: Sabry DA, El-Badry D (2020) Altered retina and cornea of Clarias gariepinus (Siluriformes: Clariidae) under the effect of bright and dim lights. Zoologia 37: 1-11. https://doi.org/10.3897/zoologia.37.e51603
Figure 6 Mean thickness of the cornea in Clarias gariepinus. Each column represents the mean value ± SD (n = 7); * significant at p < 0.05.
Figure 19 from: Sabry DA, El-Badry D (2020) Altered retina and cornea of Clarias gariepinus (Siluriformes: Clariidae) under the effect of bright and dim lights. Zoologia 37: 1-11. https://doi.org/10.3897/zoologia.37.e51603
Figure 19 Means of area percentage of GFAP and BAX. Each result represents the mean ± SD (n = 7). All estimated values of GFAP and BAX are significant at p < 0.05 among the different groups.
Figures 13-18 from: Sabry DA, El-Badry D (2020) Altered retina and cornea of Clarias gariepinus (Siluriformes: Clariidae) under the effect of bright and dim lights. Zoologia 37: 1-11. https://doi.org/10.3897/zoologia.37.e51603
Figures 13-18 Photomicrograph of sagittal histological sections of retina of Clarias gariepinus: (13–15) showing GFAP immunostaining: (13) control showing decreased GFAP immunohistochemistry; (14)exposure to bright light showing increased immunohistochemical reaction; (15) dim light exposure showing comparatively decreased immune reaction compared to bright light;(16–18) showing BAX immunostaining. Strong reaction appeared in different retinal layers of BL and DL retina more than in normal retina. (NL) Normal light, (BL) bright light, (DL) dim light.
Figure 12 from: Sabry DA, El-Badry D (2020) Altered retina and cornea of Clarias gariepinus (Siluriformes: Clariidae) under the effect of bright and dim lights. Zoologia 37: 1-11. https://doi.org/10.3897/zoologia.37.e51603
Figure 12 Mean thickness of the whole retina in Clarias gariepinus. Each column represents the mean value ± SD (n = 7); * significant at p < 0.05. (NL) normal light, (BL) bright light, (DL) dim light.
Figure 20 from: Sabry DA, El-Badry D (2020) Altered retina and cornea of Clarias gariepinus (Siluriformes: Clariidae) under the effect of bright and dim lights. Zoologia 37: 1-11. https://doi.org/10.3897/zoologia.37.e51603
Figure 20 Isoenzyme electrophoresis of Clarias gariepinus retina of lactic dehydrogenase (LDH), glucose- 6-phosphate-dehydrogenase (G6PDH), Super oxide dismutase (SOD). (NL) Normal light, (BL) bright light, (DL) dim light.
FIGURE 3 in Clarias gracilentus, a new walking catfish (Teleostei: Clariidae) from Vietnam and Cambodia
FIGURE 3. Illustration of Clarias aff. batrachus in Nieuhof (1682).
FIGURE 5. Clarias nieuhofii, ZRC 40071, 190.8 in Clarias gracilentus, a new walking catfish (Teleostei: Clariidae) from Vietnam and Cambodia
FIGURE 5. Clarias nieuhofii, ZRC 40071, 190.8 mm SL; Kalimantan Selatan, market in Banjarmasin.
FIGURE 4. Clarias nieuhofii, ZRC 52047 in Clarias gracilentus, a new walking catfish (Teleostei: Clariidae) from Vietnam and Cambodia
FIGURE 4. Clarias nieuhofii, ZRC 52047 (3), 194.4 mm SL: Sumatra: Jambi, Batang Hari drainage.
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