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

By Rex A. Dunham

The genetic development of fish for aquaculture and comparable fisheries is a box of study that has noticeable large advances lately. but there was no ebook which supplies an obtainable assessment of the topic formerly. The booklet fills this hole within the literature. The contents contain polyploidy, sex-reversal and breeding, gene mapping and advertisement functions.

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Example text

In the case of brown trout ϫ brook trout hybrids, triploids could be distinguished from diploids by examining the relative contribution of the maternal alleles, which should be double that of the paternal alleles for most, but not all, isozyme loci (Scheerer and Thorgaard, 1987). Sugama et al. (1988) were also able to utilize isozyme markers to evaluate the success of triploid induction in red sea bream, Pagrus major, black sea bream, Acanthopagrus achlegeli, and their hybrid. The triploid induction rate was between 87 and 97%.

Ad libitum feeding further reduced competition among groups and the best agreements between communal and separate trials were obtained when this feeding regime was utilized. Communal stocking has been demonstrated to be a valid technique for genetic evaluations in several species, including Nile tilapia (Fig. 4). Although communal stocking of channel catfish is valid, the effect of environmentally induced initial size differences on final size must still be considered. Although communal evaluation can accurately rank genotypes, caution must still be exercised in interpreting results and making recommendations prior to commercial application of genetically enhanced aquatic organisms.

Genotype–environment interactions are common for triploid fish. Triploid production has great potential to enhance performance in fish and shellfish; however, many problems exist. The first is that triploids can sometimes be fertile, defeating the advantages of sterility. Polyploidy can decrease performance for some traits. For many species, polyploid production may not be economically feasible. A. Dunham 2004. A. Dunham) Polyploidy 1984; Lou and Purdom, 1984). 1). Ueda et al. (1988) were able to induce triploidy in rainbow trout by applying high pH and high calcium to either sperm or eggs.

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