Suchergebnisse

Not Available ; The State of Maharashtra has vast stretches of estuaries, creeks and mangrove swamps, which offers great potential for aquaculture, particularly for mud crab farming. In view of the natural resources and market potential for mud crab, the Department of Forests, Government of Maharashtra plans to promote mud crab farming through a novel approach, which aims at providing livelihood support to the local communities utilizing the mangrove wetlands; thereby the local communities also shoulder the responsibility of conservation of mangroves. In this backdrop, a study was conducted to identify the suitable sites for sustainable mud crab culture, in GIS environment, based on various physical and environmental criteria including topography, soil types, landuse systems, vegetation, water quality, water availability, salinity, risks of flooding, infrastructure, seed resources and availability, market and support services. The brackishwater stretches of Anjarle, Kelshi, Aade, Velas and Ansure in the Ratnagiri district of Maharashtra were studied, and all study stations had patchy to thick mangrove vegetation. The major mangrove species encountered were: Avicennia marina, Avicennia officinalis, Sonneratia caseolaris, Rhizophora mucronata and Acanthus ilicifolius. The pH of water was near-neutral to alkaline, whereas dissolved oxygen levels were found to be within the ideal range. The salinity of the tidal creeks ranged from 7.24 ppt (Velas) to 35.9 ppt (Ansure) which generally varies with the tide. The ammonia levels which ranged from 0 (Aade and Ansure) to 0.5 ppm (Kelshi), falls within the safe levels for Available online at: www.mbai.org.in doi:10.6024/jmbai.2017.59.2.2014-05 aquaculture. The sediment pH ranged from 6.2 to 8.32. The organic carbon levels in sediment ranged from 0.27 to 2.94% indicating medium to high productive nature of sediment. Samples of mud crab collected from the study areas were processed for screening for WSSV infection. All samples gave Negative results in primary as well as nested PCRs, indicating the absence of WSSV in the wild mud crab population. Integrating the analysis result along with supporting spatial data with the aid of GIS and Remote Sensing techniques, a total of 10.063 ha have been evaluated as suitable areas for mud crab farming along the brackishwater stretches of Anjarle (1.91 ha), Aade (2.069 ha), Kelshi (1.77 ha), Velas (0.538 ha) and Ansure (3.776 ha). ; Not Available

Not Available ; In India, the adoption of mussel (Perna viridis) farming, practice began in 1996 when it was field tested in the shallow backwaters of Padanna in Kasaragod District of Kerala. This paved the way for commercial mussel production from northern districts of Kerala, particularly in Padanna Backwaters by coastal villagers. There was a steady rise in mussel production from estuarine farms till 2008, which was followed by a reduction since 2009. During 2015, this rate of reduction in farmed mussel production was drastic, recording as high as 93.8%, when compared to the 2014 figures. This reduction was not restricted to Padanna Backwaters alone, as there was mortality and decline in production in all northern districts of Kerala in 2015. Mussel farming sector of Padanna Backwaters is confronted with several problems. With rapid growth in farming the availability of mussel seeds became limiting and farmers sourced seeds from distant locations resulting in poor seed quality at the time of seeding. The supply-demand gap pushed the farmers to compromise on the seed quality. This resulted in tended mussel stocks which were susceptible to stress. The environmental degradation in the farmed area of Padanna due to excessive number of farms per unit area and reduced flushing of water in certain pockets was further burdened by the extremely high ambient air and water temperatures in 2015-16. The prevailing environmental anomaly resulted in higher than normal salinity and high temperature, which compounded the environmental stress on the farmed mussels. This resulted in a crisis in February 2016, leading to stunted growth, high mortality and prevalence of the protozoan parasite, Perkinsus olseni. The CMFRI's scientific team which has been monitoring the mussel farming activity in the area, setup a task force to identify the issues and suggest solutions to farmers and the Government. The adoption of sustainable aquaculture practices in Padanna Backwaters by improving the quality of seeds, enhancing the flushing rates, modifying the farm layout and reducing the farming density per unit area are among the 21 recommendations proposed by CMFRI task force to tackle these challenges. These recommendations are complementary to the global guidelines for Best Aquaculture Practices for mussels. This requires the collaborative effort from the farmers, local administration and the fisheries department. ; Not Available