Download Aquaculture and fisheries biotechnology : genetic approaches by Rex A. Dunham PDF

By Rex A. Dunham

The expansion cost of globally aquaculture has been sustained and fast, and the explosion of analysis in genetic biotechnology has made major effect on aquaculture and fisheries, even though power for far higher growth exists. Aquaculture and Fisheries Biotechnology covers issues necessary to the research of fish genetics, together with qualitative and quantitative features, crossbreeding, inbreeding, genetic float, hybridization, choice courses, polyploidy, genomics and cloning. This absolutely up to date moment variation additionally addresses environmental danger, meals safeguard and executive rules of transgenic aquatic organisms, advertisement purposes of fish biotechnology and destiny matters in fish genetics. it's crucial analyzing for researchers and scholars in fish genetics and fish molecular genetics.

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1999) and the reproductive performance of domesticated Penaeus monodon is similar to that of wild brood stock (Crocos and Preston, 1999). Strain variation within a species can cause one to make incorrect generalizations about species. If one strain is chosen to define the characteristics of the species, mistaken generalizations could be made. For instance, the statement that channel catfish grow faster than blue catfish is essentially correct; however there is an overlap of performance. If a variety of strains of the two different species are examined, the fastest-growing channel catfish strains grow faster than the fastest-growing blue catfish strains.

The saddleback gene, S, is not a sex-linked gene, is dominant and semilethal. The SS genotype is lethal. Ss heterozygotes are saddleback with greatly reduced survival, only about one-third survive, and ss is normal phenotype. If the saddleback gene is introgressed into other species the inheritance becomes much more complicated and epistasis is involved. This is a common phenomenon, and when mutations with simple inheritance are placed in an interspecific genome, epistasis often occurs. Deformities can be valuable in the ornamental trade, but are usually undesirable in the food fish industries.

Individuals homozygous for this gene have respiratory 32 Chapter 3 problems, are dwarfs and are sterile, and often those calves will eventually die. After this bull was used, a large number of calves with snorter dwarfism were born causing a large economic loss, and increasing the allele frequency of this deleterious recessive gene in the cattle population because of inadequate progeny testing. Two basic progeny testing systems can be used: heterozygous tester and homozygous tester systems. When utilizing a heterozygous tester, the animal with the unknown genotype and the normal phenotype (AA or Aa) is mated with a known heterozygote Aa to attempt to identify Aa genotypes and cull them from the population.

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