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

By Rex A. Dunham

The genetic development of fish for aquaculture and comparable fisheries is a box of study that has obvious substantial advances in recent times. but there was no publication which supplies an obtainable assessment of the topic earlier. The publication fills this hole within the literature. The contents contain polyploidy, sex-reversal and breeding, gene mapping and advertisement purposes.

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Ether alone or in combination with hydrostatic pressure did not result in triploid induction in rainbow trout (Lou and Purdom, 1984). , 1989). , 1989). Hydrostatic pressure (Fig. 1) produces more consistent results, survival of treated eggs and per cent triploidy than temperature shocks and other treatments (Cassani and Caton, 1986a; Bury, 1989). , 1985). The male pronucleus then fuses with the female pronuclei, resulting in the triploid zygote. The pronuclei is smaller and located closer to the surface of the egg than in the untreated diploid zygotes.

Apparently, the cyclical feeding placed the fish in at least a partial physiological condition to better resist this disease. Communal Stocking/Evaluation Communal stocking was developed by Israeli scientists (Moav and Wohlfarth, 1973) to overcome shortages of experimental units. In communal ponds, different genetic groups of aquatic organisms are stocked together for assessing differences among the groups. Communal experiments, stocking all genotypes in each replicate/experimental unit, are more efficient than experiments where the replicates are in separate ponds, cages, aquaria or tanks.

This phenomenon is common in mammals and has been documented in humans (Graham and Adrianzen, 1972) and cattle (Horton and Holmes, 1978). , 1998; Soether and Jobling, 1999), but others suggest that the compensatory gain is limited in fish (Gaylord and Gatlin, 2000). This phenomenon is of great interest as it has several applications in aquaculture. Some farmers believe that stunted fingerlings exhibit extraordinary growth and compensatory gain and prefer them for stocking in grow-out ponds. If compensatory gain were to exist in fish, it would negate the validity of multiple rearing to produce fish of similar size for initiation of growth comparisons.

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