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Native stocks are usually collected as sources of broodstock supply. [ 18 ] [ 19 ] There are also examples of pond-reared Penaeidae broodstocks. [ 2 ] These shrimp are raised in suitable environmental conditions including a 12–14 hour/day photoperiod, a water temperature of 25–29 °C and full seawater salinity with high water exchange rates.
The best time to stock is in the spring or fall due to mild temperatures and higher levels of oxygen in the water. To acclimate the fish, place the transportation bag in a shaded part of the water and leave it floating for 15–20 minutes.
Fish stocks are subpopulations of a particular species of fish, for which intrinsic parameters (growth, recruitment, mortality and fishing mortality) are traditionally regarded as the significant factors determining the stock's population dynamics, while extrinsic factors (immigration and emigration) are traditionally ignored.
The growth rate of worldwide aquaculture has been sustained and rapid, averaging about 8% per year for over 30 years, while the take from wild fisheries has been essentially flat for the last decade. The aquaculture market reached $86 billion [64] in 2009. [65] Aquaculture is an especially important economic activity in China.
Aquaculture, in the United States, includes the farming of hatchery fish and shellfish which are grown to market size in ponds, tanks, cages, or raceways, and released into the wild. Aquaculture is also used to support commercial and recreational marine fisheries by enhancing or rebuilding wild stock populations.
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Fish chosen for extensive aquaculture are very hardy and often do well in high densities. Seaweed, prawns, mussels, carp, tilapia, tuna and salmon are the most prominent forms of extensive aqua cultured seafood. Extensive aquaculture facilities have negative impacts on the environment as well.
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