Marine climate and fisheries scenario of Maharashtra Climcard-4

Marine climate and fisheries scenario of Maharashtra Climcard-

Points of Interest Coverage with Connectivity Constraints using Wireless Mobile Sensors

Part 7: Network Topology ConfigurationInternational audienceThe coverage of Points of Interest (PoI) is a classical requirement in mobile wireless sensor applications. Optimizing the sensors self-deployment over a PoI while maintaining the connectivity between the sensors and the sink is thus a fundamental issue. This article addresses the problem of autonomous deployment o f mobile sensors that need to cover a predefined PoI with a connectivity constraints and provides the solution to it using Relative Neighborhood Graphs (RNG). Our deployment scheme minimizes the number of sensors used for connectivity thus increasing the number of monitoring sensors. Analytical results, simulation results and real implementation are provided to show the efficiency of our algorithm

Sea erosion threat to coastal fishing villages of Valsad district, Gujarat

A report on severe sea erosion in some of the coastal fishing villages like Moti Danti, Nani Danti and Udwada, situated at the mouth of river Ambika, Valsad District of Gujarat, during the monsoon period of 1986. Many of the huts were destroyed, fish drying yards were washed away and standing paddy crops were damaged adversely affecting the life in the village

Emerging trends in the novel drug delivery approaches for the treatment of lung cancer

© 2019 Elsevier B.V. Cancer is one of the major diseases that cause a high number of deaths globally. Of the major types of cancers, lung cancer is known to be the most chronic form of cancer in the world. The conventional management of lung cancer includes different medical interventions like chemotherapy, surgical removal, and radiation therapy. However, this type of approach lacks specificity and also harms the adjacent normal cells. Lately, nanotechnology has emerged as a promising intervention in the management and treatment of lung cancers. Nanotechnology has revolutionized the existing modalities and focuses primarily on reducing toxicity and improving the bioavailability of anticancer drugs to the target tumor cells. Nanocarrier systems are being currently used extensively to exploit and to overcome the obstructions induced by cancers in the lungs. The nano-carrier-loaded therapeutic drug delivery methods have shown promising potential in treating lung cancer as its target is to control the growth of tumor cells. In this review, various modes of nano drug delivery options like liposomes, dendrimers, quantum dots, carbon nanotubes and metallic nanoparticles have been discussed. Nano-carrier drug delivery systems emerge as a promising approach and thus is expected to provide newer and advanced avenues in cancer therapeutics

Automatic Identification System (AIS): An initiative in purse seine fisheries along Mumbai coast

Automatic Identification System (AIS) is a significant development in navigation safety since the introduction of RADAR. It was originally developed as a collision avoidance tool for commercial vessels to improve the helmsman’s information about his surrounding environment. AIS does this by continuously transmitting a vessels identity, position, speed and course along with other relevant information to all other AIS equipped vessels within range

Revival of Rampani fishing for mackerel in Maharashtra

For the past few years, purse seiners from Goa were reported to be operating in coastal waters of southern Maharashtra and therefore Rampani fishery was defunct. From 2010 onwards, strict implementation of Monsoon Fishing Ban from June to August was observed in Maharashtra. The revival of the Rampani fishery was attributed by the fishermen to this ban. However, the extension of mackerel even to the northern districts of Maharashtra and further towards Gujarat coast could also be due to the high cyclic abundance of the species, as observed in the past

Indian tuna fishery - production trend during yesteryears and scope for the future

Fishery for tuna and tuna like fishes in the country has been in vogue from time immemorial and presently involves fishery by coastal based fleets of varying specifications with different craft-gear combinations and longline fishery by large oceanic fishing vessels. The former undertakes short duration fishing trips and exploit mainly surface tunas in the outer shelf and adjacent oceanic waters. The tuna landings though nominal during 1950-2005, registered a continuous increase over the years from a minimum of 848 t (1951) to 46,334 t (2000). With the introduction of targeted fishing for oceanic tunas during 2005-‘06, the landings improved and reached the maximum of 129,801 t in 2008. The fishery was supported by nine species, five coastal/neritic species and four oceanic species. Coastal tunas formed 57% of the tuna catch during 2006-’10 and was represented by the little tuna (Euthynnus affinis), frigate tuna (Auxis thazard), bullet tuna (Auxis rochei), longtail tuna (Thunnus tonggol) and bonito (Sarda orientalis). The oceanic species, which formed 43% of tuna catch, were yellowfin tuna (Thunnus albacares), skipjack tuna (Katsuwonus pelamis), dogtooth tuna (Gymnosarda unicolor) and bigeye tuna (Thunnus obesus). Information collected from different sources suggested that longliners operating in Indian EEZ and adjacent international waters caught around 87,000 t of tuna annually during 2006-'10. Catch was supported by three species dominated by yellowfin tuna and small proportion of big-eye and dogtooth tuna. Since fishery by coastal based units restricted to small areas and share of the catch by longliners from EEZ are not clearly known, systematic assessment of tuna stock in Indian EEZ is very difficult. However, the evaluation of the fishery scenario indicated only limited scope for improving tuna production from certain areas of coastal waters; whereas enormous scope remain for increasing tuna production from the oceanic waters of EEZ. However, since tunas being straddling resources shared by several nations, exploitation at one area will influence the fishery in other areas

Note on hermaphroditism in largehead hairtail Trichiurus lepturus

The ribbonfishes earlier formed lowvalue bycatch, mainly used as dry fish and for local consumption. An increase in export demand in the international market, mainly from China, Japan, and Southeast Asia has led to its targeted fishing along the Indian coast and the resource is regularly monitored for assessing its stock status

Unusual landings of Terapons

Terapons belonging to the family Teraponidae, are widely found in the Indo-west Pacific region

Fishery and bionomics of the little tuna, Euthynnus affinis (Cantor, 1849) exploited from Indian waters

Euthynnus affinis, with an average annual landing of 40,757 t during 2006-2010 formed the bulk (65.1%) of the total coastal tuna catch of the country. The fishery, biology, growth and stock structure of E. affinis was studied in detail. Hooks and lines, gillnets and purseseines were the major gears exploiting the fish. Fishery was sustained mainly by 1 - 2 year old fishes (34 to 50 cm). Size at first maturity was estimated at 37.7 cm and fecundity was 3,08,150 eggs. Spawning was observed round the year with peaks during July-August and November-January. E. affinis was found to be a nonselective generalist feeder foraging on fishes, crustaceans and molluscs. The length–weight is given by the relationship 0.0254 L2.889 with no significant difference between males and females. Age and growth were estimated using length based methods. The von Bertalanffy growth parameters estimated were L∞ = 81.92 cm, annual K= 0.56 and t0 = -0.0317. Mortality estimates were M= 0.93 and Z = 1.68 and F= 0.75 with the exploitation rate E=0.45. The maximum sustainable yield estimated was higher than the average annual catch indicating scope for further exploitation