Comparative catching efficiency of traditional prawn fishing gears in Pulicat lake of Tamil Nadu, India

303-310Prawn fishery in Pulicat Lake has a significant role in livelihood of the fishers, which is being harvested through different fishing gears. Here, we investigated the prawn-fishing gear and their catch composition. The information on various aspect about the gears was collected from the 48 respondents each month through pre-designed interview schedule by adopting random sampling. Results revealed that the quantity of prawn were higher in stake net (209.83 kg), followed by barriers (118.58 kg), drive-in-net (55.58 kg) tangle net (18.25 kg) and was statically significant at 5 %. It was estimated that more than half (52.16 %) of the total prawn catch in Pulicat Lake was obtained through stake net than the barriers (29.48 %), drive-in-net (13.82 %) and tangle net (4.54 %). The maximum quantity of prawn was obtained during the November and December in all the prawn-fishing gear (p < 0.05). This study concludes that non-selective fishing gears resulted in the abundant catch of juvenile fishes and crabs, need to be regulated mesh size, to support the conservation and sustainable harvest of the fishery resources in Pulicat Lake

Economics and marketing of dry fish production in Thoothukudi District, Tamil Nadu, India

The present study attempted to evaluate the economics and marketing of dry fish production in Thoothukudi District of Tamil Nadu, India. The information on various aspects of the dry fish enterprise was collected through random sampling of 29 dry fish producers in a pre-structured interview schedule. The results indicated that 50% of the total dry fish produced (in terms of quantity) was contributed by sardines and anchovies. However, seer fishes fetched a premium market price of ₹550 kg-1 followed by carangids (₹125 kg-1) and belonids (₹115 kg-1). Dry fish production was found to be a profitable business with an internal rate of returns (IRR) of 75% and simple rate of returns (SRR) of 43.48% respectively with a net profit margin of ₹2258.83 week-1. The study also suggests that the dry fishes reached the consumers by way of three marketing channel viz., channel 1 (producer to consumer) channel 2 (producer, middleman and consumer) and channel 3 (producer, wholesaler, middleman and consumer). Channel 1 was found the most efficient marketing channel over channel 2. The cost of raw materials, transportation, packaging and marketing margin were found to be the key factors that influences and decides the income of the dry fish producers and all the factors exhibited statistical significance at 0.05 level

Computer program for mercury penetration porosimeter-data analysis

CECRl has a Micromeritics mercury penetration porosimeter for characterisation of porous electrodes. For quick evaluation of the experimental data on porous electrodes, computer programme has been written and tested for reported results. Good agreement an pore size diibutian, surface area, and particle size distribution has been observed. The used numerical results and computer results are briefe

Contour potential mapping

A computer aided mapping for electrochemical engineering analysis has been developed using a microcomputer system. Softwares for linear interpolation, sorting, serialising and plotting have been developed and reported with flow charts, program listing and plotted result

Computer program for thermodynamic analysis of electrocapillary data

Computer program for analysis of experimental interfacial tension to evaluate excess charge density, relative surface excess of the organic sorbate and differential capacitance are briefed. Orthogonal moving polynomial fitting, least square method of smoothing the experimental data and the statistical evaluation of method of fitting are reported. The developed program is tested for the reported results

COMPUTER PROGRAM FOR THERMODYNAMIC ANALYSIS OF ELECTROCAPILLARY DATA

ABSTRACT Computer program for analysis of experimental interfacial tension t o evaluate excess charge density, relative surface excess of the organic sorbate and differential capacitance are briefed. Orthogonal moving polynomial fitting, least square method of smoothing the experimental data and the statistical evaluation of method of fitting are reported. The developed program is tested for the reported results

PC-based on-line signal analysis for voltammogram

Recording and analysis of low frequency signal is typically used in electrochemical experiments such as cyclic voltammetry, coulometry etc. In all these experiments a pair of variables, such as voltage and current (cyclic voltammetry) or variation of a single variable with time or a change or decay with time (coulometry) is typically to be recorded for subsequent analysis. The use of a PC for recording and processing of low frequency signal is presented in this pape

Comparative modelling and molecular docking of nitrate reductase from Bacillus weihenstephanensis (DS45)

Nitrate reductase catalyses the oxidation of NAD(P)H and the reduction of nitrate to nitrite. NR serves as a central point for the integration of metabolic pathways by governing the flux of reduced nitrogen through several regulatory mechanisms in plants, algae and fungi. Bacteria express nitrate reductases that convert nitrate to nitrite, but mammals lack these specific enzymes. The microbial nitrate reductase reduces toxic compounds to nontoxic compounds with the help of NAD(P)H. In the present study, our results revealed that Bacillus weihenstephanensis expresses a nitrate reductase enzyme, which was made to generate the 3D structure of the enzyme. Six different modelling servers, namely Phyre2, RaptorX, M4T Server, HHpred, SWISS MODEL and Mod Web, were used for comparative modelling of the structure. The model was validated with standard parameters (PROCHECK and Verify 3D). This study will be useful in the functional characterization of the nitrate reductase enzyme and its docking with nitrate molecules, as well as for use with autodocking