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Genome-based Biotechnologies in Aquaculture









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    Thematic Background Study – Genome-based biotechnologies in aquaculture 2021
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    Aquaculture is a relatively new but increasingly growing sector of agriculture. It is very important not only for economic interests but also for social and cultural significance. In many Asian countries, serving food fish at the dinner table is seen as highly prestigious. Food fish accounts for 20 percent of animal protein sources for the world population. The food fish industry involves a total of 144 million tonnes annual production with 44 million fishers and fish farmers and 2.1 million vessels, contributing USD 166 billion to the world economy and over USD 25 billion of international trade annually. Currently, aquaculture accounts for over 40 percent of food fish consumed in the world, and China is the only country where aquaculture produces more than 50 percent of consumed fish food (FAO, 2016). Aquaculture genomics officially started in the 1990s, although related genome research was conducted in the 1980s. It was signified by the first Aquaculture Genomics Workshop held in 1997 in Dartmouth, Massachusetts, United States of America. This workshop targeted a group of six species for genome research in the United States: salmonids, catfish, tilapia, striped bass, oysters and shrimps. As any other agricultural sector, sustained production requires research of basic biology, including growth, nutrition, reproduction, physiology, and genetics and genomics. One interesting observation is that all these research fields are being unified through the use of genomic technologies or, that is, they are being genomicized.
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    Genetic resources for microorganisms of current and potential use in aquaculture 2017
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    Aquaculture is the farming of aquatic organisms ranging from microbes to shellfish and finfish. World food fish aquaculture production more than doubled from 2000 to 2012 and contributed 42% of total fish production in 2012. Aquatic microorganisms are indispensable resources for growth of shellfish and finfish in natural aquatic ecosystems and in aquaculture. This thematic background study provides information on the genetic resources of key microorganisms on which aquaculture depends. These mic roorganisms fall into the microbial groups of (1) microalgae and fungal-like organisms, (2) bacteria, including cyanobacteria and (3) zooplankton. Many microalgal species are important in aquaculture, with different species being suitable as feed for shellfish and finfish larviculture, as components of “green water” widely used to enhance survival and growth of larval and adult fish, and as feeds to enhance the nutritional quality of Artemia and rotifers. Microalgae are also grown in aquaculture to produce pigments and fatty acids of importance in fish aquaculture and as human nutraceuticals. Bacteria that are used in aquaculture include cyanobacteria such as Spirulina used for human diet supplements and a rapidly-growing suite of probiotic bacteria. These probiotic bacteria include species that improve survival and growth of fish and shellfish larval and adult stages. Probiotic bacteria are expected to become increasingly important for disease prevention in aquaculture as antibiotic u se is further curtailed and species are grown in more intensive aquaculture systems. Bacteria also play an important role in filtration systems needed in recirculating aquaculture systems. Zooplankton, specifically Artemia and rotifers, have a long history and very wide application as feed for the aquaculture industry. Several species of Artemia are used, with Artemia franciscana being the most important. Of more thanthan 2 000 species of rotifers, Brachionus plicatilis and Brachionus rotundifor mis are most commonly used. Other zooplankton used in aquaculture include copepods that are growing in importance and cladocerans such as Daphnia that are widely used in freshwater larviculture.
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