Download e-book for kindle: Aquaculture and Fisheries Biotechnology, CABI Publishing by Rex A. Dunham

By Rex A. Dunham

ISBN-10: 0851995969

ISBN-13: 9780851995960

The genetic development of fish for aquaculture and comparable fisheries is a box of analysis that has visible gigantic advances in recent times. but there isn't any booklet which supplies an obtainable assessment of the topic. This ebook goals to fill this hole and may be compatible for complex scholars and researchers in animal genetics, fish biology and aquaculture.

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Sample text

1983), and in this example the triploids also grew faster. , 1999) and Polyploidy African catfish, C. , 1987), had the same feed conversion as diploids in tanks. Age class 0 and 1 diploid and triploid rainbow trout had the same feed conversion (Oliva-Teles and Kaushik, 1990a). The feed conversion of diploid Thai walking catfish was better than that of triploids in the first month, but diploid and triploid fish had similar means in the second and fourth months of growth (Na-Nakorn and Legrand, 1992).

Viable tetraploid C. gigas have been produced by inhibiting the first polar body of eggs from triploids that had been fertilized with sperm from diploids (Eudeline and Allen, 2000), but repeatability for producing high yields of tetraploids is inconsistent. Varying the duration of the treatment to inhibit polar body I of triploid eggs had definite effects for optimizing tetraploid production. Short treatments 15–35 min after fertilization (approximately half the period of meiosis I in triploid eggs) yielded individuals with tetraploid and heptaploid cells.

When 12 diploid and triploid families were fed canthaxanthin, triploids did not differ from diploids in average dominant wavelength and excitation purity; however, triploids were inferior for luminosity after canthaxanthin ingestion. When canthaxanthin was fed to maturing females for 37 days, the canthaxanthin retention was three times higher for diploids during the first 4 weeks, but later the canthaxanthin deposit in the flesh of triploids was higher than that of diploids (Choubert and Blanc, 1989).

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Aquaculture and Fisheries Biotechnology, CABI Publishing by Rex A. Dunham

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