By Rex A. Dunham
The genetic development of fish for aquaculture and similar fisheries is a box of study that has noticeable enormous advances in recent times. but there was no e-book which supplies an obtainable evaluate of the topic previously. The publication fills this hole within the literature. The contents comprise polyploidy, sex-reversal and breeding, gene mapping and advertisement purposes.
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Additional info for Aquaculture and fisheries biotechnology. Genetic approaches
One procedure for ﬂow cytometry utilizes ﬁxation of the red blood cells with formalin. Burns et al. (1986) found that this formalin ﬁxation lowers the amount of ﬂuorescence, which could lead to problems in data interpretation. , 1986). This is a highly accurate technique for salmonids, rainbow trout, chinook salmon and coho salmon, which have one chromosome with a NOR per haploid genome, as do most ﬁsh species. Any tissue can be used since dividing cells, rather than chromosomes, are needed for the analysis, and samples can be taken from ﬁsh as small as 7–8 mm in length without sacriﬁcing the Polyploidy animal.
This suggests that growth rate is a function of size rather than age in subadult catﬁsh. Lovell had previously reported that missing a single day of feeding per week signiﬁcantly reduced production. If compensatory gain exists, missing a single day of feeding should not decrease production. If the methods and results of Kim and Lovell (1995) are closely examined, there are several inconsistencies and explanations for the apparent compensatory gain. As in other experiments, the ﬁsh that had feed restriction the longest never completely compensated for the food deprivation.
Reduced gonadal development leads to less waste in processing. Chrisman et al. (1983) reported an average of 6% higher dress-out in tank-raised triploid channel catﬁsh at 3 years of age compared with diploids. The increased carcass yield results from the lack of gonadal development in triploids, but these ﬁsh were well past the size and age when catﬁsh are usually marketed. If dressout percentage had been evaluated at younger ages and smaller sizes, the result might have been different. , 1999).
Aquaculture and fisheries biotechnology. Genetic approaches by Rex A. Dunham