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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 obvious significant advances in recent times. but there was no publication which gives an available evaluation of the topic before. The ebook fills this hole within the literature. The contents contain polyploidy, sex-reversal and breeding, gene mapping and advertisement purposes.

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Feed consumption rates are higher and feed conversion is more efficient for the restricted fish, but this is an expected result since they were smaller throughout the experiment. The data are very convincing for the conclusion that compensatory gain does not exist. All of these experiments demonstrate that compensatory gain was not exhibited by channel catfish fingerlings; therefore the multiple rearing technique is valid for genetics experiments involving fingerling channel catfish. Schaperclaus (1933) states that compensatory gain does not exist in common carp.

The cytoplasm/nucleus ratio is constant; thus the larger polyploid nucleus causes an increase in volume of cytoplasm and total cell size (Fankhauser, 1945; Swarup, 1959b). Theoretically, triploids would reach a larger size than diploids because of their larger cell size. , 1990) adjust to this increased size by reducing cell number, and triploid stickleback are the same size as diploids. , 2001a,b,c). The cell size increases in all tissues for polyploids. There was a uniform increase in cell size for erythrocytes, leucocytes, brain cells and retinal cells in triploid coho salmon and Atlantic salmon (Small and Benfey, 1987).

2000). , 1986). This increased growth rate can be a result of lack of sexual development, since the growth rate of fish slows as they approach sexual maturity, or theoretically due to increased cell size. , 1983). This is slightly after the time when sexual dimorphism in body weight is first detected in channel catfish. , 1983); however, Johnson et al. (1986) found no differences in growth and condition factor from 18 to 30 months between diploid and triploid coho salmon after smoltification when the fish were grown in either fresh or salt water.

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