Skip to main content Skip to primary sidebar Skip to footer This tutorial shows three ways to insert trademark, copyright, and registered symbols in PDFs with Adobe Acrobat: alt codes, the Character Map, and copying and pasting. Search the site Never Miss a Tutorial! Enter your email address to receive notifications of new posts. In , a breakthrough was made by Marine fisheries Research institute, Malaysia. They discovered that certain amount for salinity was important and basic requirement for the survival and development of the early stages of Macrobrachium rosenbergii larvae.
Currently, Macrobrachium rosenbergii is the favorite species of Indian prawn culture. In India, Prawn Breeding unit of Central Inland Fisheries Research institutes developed indigenous technology for prawn culture in the year Identifying features of Macrobrachium rosenbergii.
Macrobrachium rosenbergii is also known as Giant fresh water prawn. The following are the identification features of this prawn:. Species of Prawns for culture. In India a total of 34 species of Macrobrachium comprising of 20 fresh water species and 14 coastal water species have been reported. Out of these only two species are utilized in monoculture and polyculture practices owing to their large size, fast growth and shorter life history.
These two species are,. Distribution of Macrobrachium rosenbergii. Macrobrachium rosenbergii is mainly confined to Fresh water and brackish water habitats. They are sometimes also found in marine waters. In India, Macrobrachium rosenbergii is also known as Golda chingri and Mocha chingri. The technical requirements for establishment of fresh water prawn farm and its successful operation are briefly described below:.
Step 1: Site selection. Careful selection of suitable site for fresh water prawn farming is an essential prerequisite for successful farming operation. The site selection plays an important role as the entire management aspect of the farm ultimately depends on specific conditions of the site. The aspects to be considered for site selection are as follows:.
Climatic conditions: Warm climate is the most important factor affecting prawn production. Tropical and sub-tropical climates are most suitable when the culture period is too long while warm temperate climate is suitable where culture period is short.
Also other climatic conditions like rainfall, evaporation, sunlight, wind speed etc. Topography of the location: The ideal site must be flat or gently sloped. Low-lying lands, waterlogged areas, salinity and alkalinity affected areas could be effectively used for construction of Scampi farms. Acid sulphate soils should be avoided for freshwater prawn farming. Water Quality: The availability of quality and quantity of water is a critical factor.
NOTE: We probably need to rethink the options validation system, but this constant temporarily allows for extensions to modify the list. Any module added to this array will be included into instances of Prawn::Document at the per-object level. The bounds method returns the current bounding box you are currently in, which is by default the box represented by the margin box on the document itself.
A column box is a bounding box with the additional property that when text flows past the bottom, it will wrap first to another column on the same page, and only flow to the next page when all the columns are filled. The current y drawing position relative to the innermost bounding box, or to the page margins at the top level.
A method that can either be used to access a particular grid on the page or work with the grid system directly. Moves down the document by n points relative to the current position inside the current bounding box. Moves up the document by n points relative to the current position inside the current bounding box.
Creates a new PDF Document. The following options are available with the default values marked in []. Setting e. When called with no argument, returns the current font size. When called with a single argument but no block, sets the current font size. When a block is used, the font size is applied transactionally and is rolled back when the block exits. These will also be inherited by any subclasses. When using the implicit block form, Prawn will evaluate the block within an instance of Prawn::Document, simplifying your syntax.
However, please note that you will not be able to reference variables from the enclosing scope within this block. If you need to access your local and instance variables, use the explicit block form shown below.
Another important point about bounding boxes is that all x and y measurements within a bounding box code block are relative to the bottom left corner of the bounding box. Sets Document bounds to the BoundingBox provided. See above for a brief description of what a bounding box is. This function is useful if you really need to change the bounding box manually, but usually, just entering and exiting bounding box code blocks is good enough. If resetting the top margin is desired on a new page e.
Defines the grid system for a particular document. Looks up the given font using the given criteria. Raw Blame. Open with Desktop View raw View blame.
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Copyright August , Brad Ediger. All Rights Reserved. This is free software. Implements PDF encryption password protection and permissions as.
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