गुजरात की समुद्री मात्स्यिकी के कुछ पर्याबरणीय संघात

कृपया पूरा लेखा पढ

Selectivity estimates for Sepiella inermis (Van Hasselt, 1835) in 40 mmdiamond mesh codend trawl net

Cephalopods are mostly targeted by trawlers and Sepiella inermis (spineless cuttlefish), contributes about 2-4 percent oftotal cephalopod landings in India. Cephalopods accounted for 6.9 percent of total landings in Gujarat in 2018, with S.inermis accounting for approximately 1 %. The most common length of this species in the fishery is between 35 mm to 147mm. The length at first sexual maturity varies along the coast, and recent estimates for west coast of India for this species is48 and 55 mm for males and females, respectively.There are no estimates of trawl codend selectivity for this species and experiments were carried out using a 40 mmdiamond mesh codend using covered codend method. The selection parameters for S. inermis were derived using SELECTmethodology and the length at 50 % retention (L50)±(s.e.) was worked out as 36.2±1.2 mm and selection range as 19.9±2.1mm. The selection factor and the selection ratio for the codend were worked out as 0.9 and 0.55, respectively. The suggestedmesh size for the codend based on length at first sexual maturity (LFM) of females (55 mm) and males (48 mm) wereestimated as 60 and 53 mm (diamond mesh), respectively. This is the first estimate of trawl selection for this species andoperational parameters like towing speed, codend catch etc., that could influence selectivity were not considered and hencemore studies by incorporating these factors will help in further refining the parameters of the selection curve

WETTING AND DRYING RESISTANCE OF LIME-STABILIZED EXPANSIVE SOILS MODIFIED WITH NANO-ALUMINA

Weak soil at construction sites necessitates ground improvement. Chemical stabilization is typically carried out using either lime or cement. The primary objective of this study was to assess the strength and durability of lime-stabilized soils modified with nano-alumina (NA). This study adopted the scientifically established initial consumption of lime (ICL) content for soil stabilization. In addition, nano-alumina was added in varying percentages as an auxiliary additive. It was observed that 0.5 % of nano-alumina was optimal with respect to the ICL for maximizing the soil stabilization. The stabilized soils were cured for 0, 7, 14, and 28 days. Post-curing testing revealed that the strength increased sixfold for the optimal combination, compared with the virgin soil. To understand the durability behavior of the optimal combination, the stabilized soil specimens were subjected to wetting and drying cycles after 28 days of curing. The optimal combination was nearly as durable as that of the lime-stabilized soil subjected to five cycles of wetting and drying

Applications of Box-Behnken experimental design coupled with artificial neural networks for biosorption of low concentrations of cadmium using Spirulina (Arthrospira) spp.

The present study deals with the application of artificial intelligence techniques coupled with Box-Behnken (BB) design to model the process parameters for biosorption of cadmium using live Spirulina (Arthrospira) spp. as adsorbent in open race way pond with Zarrouk medium. The biomass concentration of Spirulina spp. decreased to half at 4 ppm Cd (II) after 8 days. Based on the LCt50 values, 3.69 ppm (8th day), Spirulina (Arthospira) maxima showed maximum tolerance. Considerable growth and bioaccumulation of Spirulina spp. is observed below 1 ppm and tolerant up to 3 ppm. The cadmium adsorption on Spirulina spp. showed good correlation (R2 = 0.99) when applied to Freundlich equation and data fit into pseudo second order kinetics. A four factorial, three blocks and three level Box-Behnken design with initial concentration (1 ppb to 5 ppb), biosorbant dosage (0.1 gdw to 0.2 gdw), agitation speed (12 rpm to 16 rpm) and pH (6 to 8) as independent variables and percentage adsorption as dependent variable were selected for study. The data were further processed using artificial neural network model and DIRECT algorithm for better optimization. The final Cd (II) concentration of 0.5 ppb was achieved with 1 ppb initialconcentration under optimal conditions. A continuous desorption process was also developed for removal of cadmium from Spirulina (Arthrospira) sp

Toll-Like Receptors and Cytokines as Surrogate Biomarkers for Evaluating Vaginal Immune Response following Microbicide Administration

Topical microbicides are intended for frequent use by women in reproductive age. Hence, it is essential to evaluate their impact on mucosal immune function in the vagina. In the present study, we evaluated nisin, a naturally occurring antimicrobial peptide (AMP), for its efficacy as an intravaginal microbicide. Its effect on the vaginal immune function was determined by localizing Toll-like receptors (TLRs-3, 9) and cytokines (IL-4, 6 , 10 and TNF-α) in the rabbit cervicovaginal epithelium following intravaginal administration of high dose of nisin gel for 14 consecutive days. The results revealed no alteration in the expression of TLRs and cytokines at both protein and mRNA levels. However, in SDS gel-treated group, the levels were significantly upregulated with the induction of NF-κB signalling cascade. Thus, TLRs and cytokines appear as sensitive indicators for screening immunotoxic potential of candidate microbicides

Generation of energetic negative ions from clusters using intense laser fields

Intense laser fields are known to induce strong ionization in atoms. In nanoclusters, ionization is only stronger, resulting in very high charge densities that lead to Coulomb explosion and emission of accelerated highly charged ions. In such a strongly ionized system, it is neither conceivable nor intuitive that energetic negative ions can originate. Here we demonstrate that in a dense cluster ensemble, where atomic species of positive electron affinity are used, it is indeed possible to generate negative ions with energy and ion yield approaching that of positive ions. It is shown that the process behind such a strong charge reduction is extraneous to the ionization dynamics of single clusters within the focal volume. Normal and well-known charge transfer reactions are insufficient to explain the observations. Our analysis reveals the formation of a manifold of Rydberg excited clusters around the focal volume that facilitate orders of magnitudes more efficient electron transfer. This phenomenon, which involves an active role of laser-heated electrons, comprehensively explains the formation of copious accelerated negative ions from the nano-cluster plasma

Manual on Entrepreneur-Ready Technologies of CMFRI

CMFRI presented five entrepreneur- ready technologies in the “Innovation 4 Industry Meet” organized by Zonal Technology Management Centre, Business Planning & Development Unit (ZTMCBPDU), South Zone, CIFT and National Fisheries Development Board held at Visakhapatnam on 8th September 2010 and in the ‘Rural Technology Mela’ organized by National Institute of rural Development at Hyderabad during 2nd to 5th February, 2011. A detailed presentation and exposition including prospective business proposals on the five technologies namely‘Green Mussel extract (GMe)’, ‘Varna (the marine ornamental fish feed)’, ‘Broodstock development, captive breeding and larval production of 17 species of marine ornamental fishes’, ‘Larval production of Cobia fish’ and ‘A device for breeding and culturing marine fish in open sea through cage farming’ were made in the meets. ‘Open sea cage farming in HDPE cage’ and ‘Low cost cage farming in GI cage’ were show-cased in the recently held ICAR-CII Industry Meet organized at NAAS Complex, New Delhi on 23rd May, 2011. The presentation and the exhibition in these meets got the attention of many prospective industrialists/ entrepreneurs which resulted in signing up of a few business proposals

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Not AvailableGillnets are commonly used in inland lakes due to their simplicity in construction and operation, efficiency, and low energy usage. The Vembanad lake is one of the most prominent lakes in Kerala, contributing significantly to the small-scale and artisanal fisheries, in which gillnets are the predominant gear. There have been studies on the effect of gillnet panel colour on the selective capture of fish species, primarily in the open ocean and rivers. Although a considerable number of studies exist on the species profile and fish catching methods in the lake, the efficiency of coloured webbing for gillnets is not available. The efficiency of coloured webbing for gillnets is not documented, which, if available, would be a crucial input for implementing gearbased technical measures for conservation in gillnets in the lake. In this regard, a study was conducted along Vembanad lake and the lower reaches of the Muvattupuzha river to compare the catch efficiency and species profile of transparent gillnets typically employed in the region with gillnets fabricated using blue and green coloured webbing. The results demonstrated a considerable increase in CPUE for green-coloured gillnets (708.9±12.8 grams per operation) compared to blue and transparent gillnets, which had CPUE values of 397.9±80.2 and 293.7±70.6 grams per operation, respectively. Significantly higher catches of Horabagrus brachysoma and Etroplus suratensis were obtained with the green-coloured gillnets than with the control (Transparent). Lengthwise data showed that green-coloured nets captured larger individuals of E. suratensis, but significant difference was not observed in other species. The number of E. suratensis captured in each gillnet contributed to the most dissimilarity in all comparisons, followed by Gerres sp. and H. brachysoma, according to similarities percentage analysis conducted to comprehend the species assemblage structure. This is the first report on the effect of gillnet colour on the catch efficiency of gillnets in Vembanad lake, and the results, which indicate species-specific differences in capture, will be one of the many inputs necessary for implementing gear-based technical measures in the gillnet fishery in the lake.Not Availabl

Assessment of Economic Loss due to Use of Legal Codend Mesh in Multi-day Trawlers in Gujarat

The current trawling practices result in high exploitation of juveniles of all commercial and non-commercial species, in all maritime states of India (Najmudeen and Sathiadas, 2008). For example, the percentage of juveniles exploited by trawl can be as high as 20 to 60% in the case of seerfishes and groupers and as much as 12% in the case of squids (Mohamed et al., 2009a). In other words, there is substantial amount of growth overfishing taking place for all commercial stocks in the trawl fisheries of India. Growth overfishing occurs when too many small fish are harvested, usually because of excessive effort and poor selectivity of the gear (e.g. too small mesh sizes) and the fish are not given the time to grow to the size at which the maximum yield-per-recruit would be obtained from the stock. A reduction of fishing mortality on juveniles or their outright protection, would lead to an increase in yield as well as profits from the fishery

Development of a dual-gene PCR assay for simultaneous amplification of structural and non-structural genes of bovine rotavirus A

45-48Rotavirus can be detected in stool samples by using serological and molecular methods. An easy and rapid dual gene RT-PCR assay for the simultaneous amplification of the capsid protein VP4 (structural) and rotavirus enter toxin NSP4 (non-structural protein) has been developed. We validated the assay by comparing the results of single target PCR with dual-gene PCR products