Download Aquaculture Microbiology and Biotechnology, Vol. 1 by Didier Montet, R.C. Ray PDF

By Didier Montet, R.C. Ray

Aquaculture is at present one of many quickest starting to be construction sectors on the earth. It now debts for almost part (45%) of the world�s nutrition fish (which refers to creation of aquatic animals: fish, crustaceans, molluscs, amphibians) and this bring up is predicted to arrive 50% in 2015. Genetic engineering and biotechnology have contributed tremendously to this box. the main general equipment in fish biotechnology are chromosome manipulation and hormone remedy which are used to supply triploid, tetraploid, haploid, gynogenetic and androgenetic fish.

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In contrast, when fish were reared under naturalized stream conditions, transgenic fish were only 20% longer than the wild fish, and the magnitude of difference in relative predation effects was quite reduced. A major cause of concern regarding aquaculture is the escapement of farmed organisms into the wild and subsequent interaction with native populations, possibly leading to significant alterations in the properties of the natural ecosystem (Ramirez and Morrissey, 2003). , 2005). When transgenic fish breed with wild populations, the resulting fish may acquire transgenes that could alter natural behaviour in areas such as reproduction, anti-predator response, and feeding (Galli, 2002).

Tetraploids are induced in a similar way as triploids, but during a more advanced stage of embryonic development. A tetraploid/diploid cross would be expected to produce all-triploid progeny that might be more viable than mechanically induced triploids, as triploid embryos would not have to undergo the same stress and damage that occurs during mechanical induction (Rasmussen and Morrissey, 2007). POSSIBLE EFFECTS OF TRANSGENIC FISH IN THE ENVIRONMENT AND FOR HUMAN HEALTH Transgenic fish in aquaculture have the potential to advance the industry and help supply a growing global food demand, there is concern over the potentially negative effects of introducing genetically altered fish into the food chain.

The other line of zebrafish contained the T7 RNA polymerase driven by a protamine promoter specifically expressed in the gonad. When these 2 lines of zebrafish are crossed, the offspring specifically express the T7 RNA polymerase in the gonads, resulting in the expression of the Cre recombinase and excision of the foreign gene. This concept would allow for the creation of transgenic individuals lacking the ability to pass on a foreign gene. , 1999). First, the potential introduction of the missing L-ascorbic acid biosynthesis (L-AAB) pathway in rainbow trout by delivery of the rat L-gulono-g-lactone oxidase (GLO) cDNA was tested.

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