NOPR Collection:

A brief perspective on Japanese eel (Anguilla japonica Temminck & Schlegel, 1846) an indispensable part of Japanese culture

2020-06-01T00:00:00Z

Title: A brief perspective on Japanese eel (Anguilla japonica Temminck & Schlegel, 1846) an indispensable part of Japanese culture Authors: Yadav, V K; Pandey, S; Kaushik, P Abstract: Anguilla japonica, also known as Japanese eel, is an integral part of Japanese culture from centuries. This fish spawns in the Mariana islands, and subsequently the larval stages migrate towards east Asia. Whereas, the sexually maturing eels return back to the spawning grounds in the ocean. Being commercially vital, the glass eels are intensively captured to be used in aquaculture systems along east Asia. This practice along with the climate change contributes to a significant decline in the Japanese eel population. Further, to counteract the increasing demand of Japanese eel in domestic market, their mass production through aquaculture systems require a higher amount of innovation in terms of their feeding and rearing technology. Here we have summed up all the important information about the Japanese eel based on the thorough survey of already published literature. Overall, this review will be useful for a better understanding of the currently available information pertaining to the species. Page(s): 933-939

Temporal behavior of north east monsoon rainfall during extreme NEMR years over Peninsular India

2020-06-01T00:00:00Z

Title: Temporal behavior of north east monsoon rainfall during extreme NEMR years over Peninsular India Authors: Simon, E K; Sajeev, R; Mathew, B Abstract: Strong, weak and normal Northeast Monsoon Rainfall (NEMR) are defined depending on the strength of the Northeast Monsoon (NEM) rainfall compared to the long period average (LPA) using monthly rainfall data of Peninsular India (PI). Behavior of NEM monthly (October, November and December) rainfall and contribution of monthly rainfall towards NEM seasonal rainfall is examined during extreme (strong and weak) NEMR years. Strength of association between PI monthly and PI NEM seasonal rainfall is computed and the Wilcoxon Mann-Whitney rank sum test is used to evaluate the differences in the rainfall of NEM months between strong and weak NEM years. It is observed that October/November months contribute maximum rainfall to the NEMR and December contributes the least irrespective of the strength of NEMR and that during strong NEMR years rainfall contribution in October – December months is significantly more than the rainfall in the corresponding months during weak NEMR years. Composite analysis shows that rainfall in each of the NEM months is more than the LPA of the corresponding months during strong NEMR years and less than the LPA of the corresponding months during weak NEMR years. Correlation analysis between PI NEMR and PI monthly rainfall shows that November rainfall has the highest linear correlation whereas December rainfall has the least. The percentage contribution of rainfall is largest in October and least in December and the annual variability is highest for November and least for December. Page(s): 940-946

Isotope hydrochemistry of the lakes in Schirmacher Oasis, East Antarctica

2020-06-01T00:00:00Z

Title: Isotope hydrochemistry of the lakes in Schirmacher Oasis, East Antarctica Authors: Gopinath, G; Resmi, T R; Praveenbabu, M; Pragath, M; Sunil, P S; Rawat, R Abstract: The study aims to find out the ionic and isotopic compositions of some lakes in the Schirmacher Oasis in east Antarctica. The water samples were collected from 12 lakes near the Indian Antarctic station, Maitri. The chemistry of lake water indicates contribution from glacial melt water and lithology of the area. Evaporation from shallow lakes was also found to be controlling the lake water chemistry. The isotopic concentration of the lake waters also indicated input from the melt water from adjacent glaciers. δD varied between -167.2 ‰ and -250.2 ‰ and δ¹⁸O from -18.0 ‰ to -31.2 ‰. It was found that diffusion controlled kinetic effect at the liquid-ice interface for different water isotopologues and evaporative enrichment of heavier isotopes from open water bodies determined the slope of the regression line of the lake water. Page(s): 947-953

Sedimentary fabrics and diagenetic features of the Late Triassic Kingriali Formation, Khisor-Marwat ranges, Pakistan

2020-06-01T00:00:00Z

Title: Sedimentary fabrics and diagenetic features of the Late Triassic Kingriali Formation, Khisor-Marwat ranges, Pakistan Authors: Abdulghani, A; Ghazi, S; Riaz, M; Zafar, T Abstract: The Triassic succession of Khisor-Marwat ranges exposed extensively in Pakistan is comprised of the Mianwali, Tredian and Kingriali formations, predominantly deposited in peritidal channels to superatidal zones of peritidal environment with influence of marine and meteoric water. The present research intends to present comprehensive studies on sedimentary fabrics of the upper most Kingriali Formation. Inclusive sedimentological and petrographical investigations were executed on the Late Triassic Kingriali Formation from the Chunda and Paniala area, where it is primarily composed of dolomite interbedded with sandstone. Field observation reveals that the light-grey to light-brown, sugary textured, crinoid dolomites sandy and marly at places whereas the sandstone is brownish at weathered surface, fine- to medium-grained, massive, friable and cross-bedded. The greenish to black colored dolomitic shale in the Chunda section is interbedded with dolomite. Based on lithological characteristics, the Kingriali Formation is classified into four units including; sandy dolomite, dolomitic limestone, thick-bedded dolomite with green shale, and thin-bedded dolomite with black shale. The whole rock analysis of Kingriali dolomite implies that the dolomite has been crystallized in mix water condition, however, re-crystallization and formation occurred in the mid-late diagenetic settings. The analyzed diagenetic features of the rock unit suggest Kingriali Formation as potential reservoir. Page(s): 954-964