![]() ![]() The grow-out of stock relies on the natural productivity of the aquatic system the stock feed on existing food without supplemental addition by the farmers. The seedstock are either fingerlings (juvenile fish) or juvenile stages of crayfish species. The extensive rearing process generally begins with the initial release of seedstock into the dams or production waters. No nutrients (e.g feed) are added to the system during the grow-out process. Low stocking densities remove the need for water exchange and supplementary aeration. The stock is left to grow on its own, utilising natural food sources. Extensive culture does not rely on excessive intervention in the growing process. However, trials have highlighted a number of possible aquaculture candidates generally unsuitable to intensive culture but suitable for extensive culture. Traditionally, intensive culture has much higher production rates, shorter grow-out periods, greater overheads and production costs and potentially greater returns per unit area. ![]() Intensive culture involves intervention in the rearing process through supplemental feeding, water aeration and exchange and in some cases environmental manipulation. Much of the interest over the years in aquaculture has been primarily focused on the intensive culture of fish. Aquaculture can be divided into two main forms of culture intensive and extensive. ![]()
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