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 analysis that has noticeable huge advances lately. but there was no e-book which gives an available evaluation of the topic previously. The publication fills this hole within the literature. The contents comprise polyploidy, sex-reversal and breeding, gene mapping and advertisement functions.

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1982a). Tiwary et al. (1999) examined several body proportions in triploid Indian catfish, Heteropneustes fossilis, to distinguish the two genotypes, triploid and diploid. Several significant differences were found for various morphometric ratios between the two ploidy levels; however, only the ratio between standard length and body depth was a precise indicator to separate triploids from diploids. Carcass traits and flesh quality A potential benefit of polyploidy is positive changes in carcass traits (Dunham, 1990a).

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.

H. , 1989b). The neutral lipid triglyceride was higher in the triploids and in the diploids during the non-spawning season in the belly and dorsal muscles compared with the diploids during the spawning season, but the glycolipid and the phospholipid phosphatidylcholine were lower for triploids and diploids of the non-spawning season compared with diploids in the spawning season. The total lipids of triploid common carp and diploids out of spawning season were higher than in diploids during the spawning season.

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