By Rex A. Dunham
The genetic development of fish for aquaculture and comparable fisheries is a box of study that has visible mammoth advances lately. but there was no ebook which supplies an available evaluation of the topic before. The e-book fills this hole within the literature. The contents contain polyploidy, sex-reversal and breeding, gene mapping and advertisement purposes.
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Extra info for Aquaculture and fisheries biotechnology. Genetic approaches
1995) had no growth superiority compared with either parent up to age 2 and 3 years. , 2000). After 3 years, the growth differences remained but were small. Sexual maturation resulted in males of all genotypes being smaller than females. When female grass carp, Ctenopharyngodon idella, were hybridized with male bighead carp, H. , 1984). , 1986) diploid hybrids. , 1987). Family effects for the performance of triploids exist. , 2001). Withler et al. (1998) found an interaction between family and ploidy level for growth of coho salmon.
Phenotypic Variation and Environmental Effects pared with what they would obtain in the commercial setting. Therefore, if biotechnologically enhanced ﬁsh and shellﬁsh are either developed or evaluated with commu- 21 nal evaluation, they should be tested once under separate evaluation to determine any magniﬁcation effects and genotype–environment interaction prior to release to farms. 3 Polyploidy Polyploidy has been thoroughly studied in ﬁsh and shellﬁsh. The polyploid state refers to individuals with extra sets of chromosomes.
Phenotypic Variation and Environmental Effects Restricted feeding could possibly result in additional problems, such as alterations in disease resistance. Lovell (1996) and Okwoche and Lovell (1997) reported that resistance to the bacterium Edwardsiella ictaluri was better in 1-year-old channel catﬁsh that were fed compared with unfed channel catﬁsh, but the opposite was true in 2-year-old ﬁsh. However, again, management of the environment is important in these evaluations because these results were possibly confounded by varying oxygen and ammonia levels in the experimental aquaria.
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