Publications by authors named "Narinder Kumar Chadha"
Effects of environmentally relevant ultraviolet B (UVB) light on the embryonic development of a high-altitude dwelling endangered fish, Tor putitora (golden mahseer), were investigated for the first time. For that, three sets of embryos (in triplicates) were exposed to various ambient UVB light doses (1, 2 and 3 W/m, corresponding to 3.6, 7.
View Article and Find Full Text PDFInfluence of stocking density and environmental factors on the expression of insulin-like growth factors in cage-reared butter catfish (Ompok bimaculatus, Bloch 1794) within a large reservoir ecosystem.
Environ Sci Pollut Res Int
December 2023
Article Synopsis
- Insulin-like growth factors (IGFs) are crucial for growth in vertebrates, and the GH-IGF axis can be used to monitor fish growth performance, particularly in butter catfish (Ompok bimaculatus).
- The study examines the molecular characteristics and expression levels of igf-1 and igf-2 in the liver and muscle of fish under varying stocking densities over a 180-day culture period, revealing that igf-1 expression decreases at higher densities while igf-2 remains stable.
- The research finds that igf-1 is a better growth regulator related to culture density, with potential implications for improving harvest scheduling and optimizing culture practices in aquaculture.
Temperature alters the oxidative and metabolic biomarkers and expression of environmental stress-related genes in chocolate mahseer (Neolissochilus hexagonolepis).
Environ Sci Pollut Res Int
March 2023
Long-term acclimation temperature effects on biomarkers of oxidative stress, metabolic stress, expression of heat shock proteins (Hsps), and warm-temperature acclimation related 65-kDa protein (Wap65) were evaluated in the threatened chocolate mahseer (Neolissochilus hexagonolepis). Fifteen-day-old larvae were acclimated to different water temperatures (15, 19, 23-control group, 27, and 31 °C) for 60 days prior to the sampling for quantification of mRNA, enzyme, nitric oxide, and malondialdehyde (MDA) content. Acclimation to 31 °C increased the basal mRNA level of glutathione S-transferase alpha 1 (GSTa1), and activities of catalase (CAT), glutathione reductase (GR), and GST enzymes and but downregulated the expression of superoxide dismutase 1 (SOD1) in the whole-body homogenate.
View Article and Find Full Text PDFGlobal agriculture is facing tremendous challenges due to climate change. The most predominant amongst these challenges are abiotic and biotic stresses caused by increased incidences of temperature extremes, drought, unseasonal flooding, and pathogens. These threats, mostly due to anthropogenic activities, resulted in severe challenges to crop and livestock production leading to substantial economic losses.
View Article and Find Full Text PDFClimate vulnerability and induced changes in physico-chemical properties of aquatic environment can bring impairment in metabolism, physiology and reproduction in teleost. Variation in environmental stimuli mainly acts on reproduction by interfering with steroidogenesis, gametogenesis and embryogenesis. The control on reproductive function in captivity is essential for the sustainability of aquaculture production.
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- * Results showed that fish in low stocking density (10 m) had better growth and feed efficiency, while medium density (20 m) yielded a higher overall production; however, higher densities negatively impacted muscle quality and increased stress biomarkers.
- * The study concluded that the optimal stocking density for raising L. rohita in open water cages is 10 m, as this level balanced growth performance with reduced stress and better meat quality.
Captive breeding programs for Neolissochilus hexagonolepis are essential for population restoration. To develop an efficacious method for enhancing N. hexagonolepis spawning in captivity, there was examination of: (1) different types of spawning substrate and (2) area of spawning in the substrate.
View Article and Find Full Text PDFEnvironmental parameters and stocking density influence growth, feed utilization and economics of butter catfish, Ompok bimaculatus (Bloch, 1794) production in floating net cages in a large tropical reservoir, India.
Environ Sci Pollut Res Int
November 2021
Article Synopsis
- An experiment was carried out for 180 days to analyze how environmental conditions and stocking density affect the growth, survival, feed utilization, and economic viability of butter catfish in floating cages in India.
- The study found that a lower stocking density of 15 fingerlings per meter resulted in significantly better growth metrics, survival rates, and feed efficiency compared to higher densities, particularly at 35 fingerlings per meter.
- The research concluded that maintaining lower stocking densities (15-25 fingerlings per meter) not only enhances fish growth and survival but also yields better economic returns, with the best benefit-cost ratio observed at the lowest density.
The present study was aimed to assess the effect of temperatures on egg incubation, growth, standard metabolic rate (SMR), and thermal tolerance of a near threatened Himalayan hill stream chocolate mahseer (Neolissochilus hexagonolepis). For the hatching study, eggs were incubated in four temperatures (17, 20, 23, and 26 °C). The total hatching and free-swimming larvae percentage were higher at 23 °C (p < 0.
View Article and Find Full Text PDFAnti-oomycetes and immunostimulatory activity of natural plant extract compounds against Saprolegnia spp.: Molecular docking and in-vitro studies.
Fish Shellfish Immunol
July 2021
This study aimed to investigate the effectiveness of five natural plant extract compounds Curcumin (CUR); Eugenol (EUG), Cinnamaldehyde (CIN), Stigmasterol (ST) and Morin (MOR), on two species of Saprolegnia; Saprolegnia parasitica and S. australis. Selective compounds were screened for the minimum inhibitory concentration, first for anti-oomycetes activity and then mycelium growth inhibition, spore germination inhibition and colonisation test.
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- * Chronic hypoxia led to decreased production of sex steroids due to the inhibition of an important enzyme (HMG-CoA reductase) involved in cholesterol synthesis, resulting in lower cholesterol levels in both gonads and liver.
- * In response to hypoxic stress, koi carp shifted to using triglycerides as an energy source instead of producing cholesterol, demonstrating a survival strategy to cope with low oxygen in their environment.
An 18-months field trial was performed to explore the effect of duration of stunting on growth, digestive enzymes and carcass quality in Chanos chanos. Milkfish fry (weight of 1.25 ± 0.
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