Fish Farming Guide
Although seagrass beds are in rapid decline in many coastal zones world-wide, little research has been undertaken to explore the changes on coastal biogeochemistry during meadow decline. The wasting disease in Northern America and Northern Europe during the 1930s resulted in significant coastal erosion and loss of fisheries habitat, but as eelgrass is a fast-growing species with rapid colonization capacity most of the eelgrass meadows were reestablished within 10 years. It has turned out to be much more difficult to assess the effects of eutroph-ication and recession of depth limits for eelgrass, as the coastal ecosystems appear to change in multiple directions. Effects of eutrophication may be severe for slow-growing species such as P. oceanica in the Mediterranean due to low re-colonization capacity. High loading of organic matter in seagrass meadows, e.g. due to fish farming, has shown unbalanced metabolism leading to strong heterotrophy, loss of seagrass biodiversity, overgrowth...
Often the terrain of cardamom estates is undulating with moderate to steep slopes. Quite a number of small and fairly big streams pass through many of these areas. Runoff from the cardamom watersheds can be collected in farm ponds and check dams or underground water tapped through dug wells. Harvested water can be stored in ponds and checkdams by minimizing the losses through seepage, evaporation and recycling. Apart from improving and stabilizing yields under rainfed cardamom cultivation, checkdams, farm ponds and dug wells reduce flood hazards and recharge ground water. Such devices in many cases will serve as percolation tanks that would substantially augment the ground water availability in the area.
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