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Evidence of genetic and environmental influences on meristic variation in the rainbow trout salmo gairdneri


, : Evidence of genetic and environmental influences on meristic variation in the rainbow trout salmo gairdneri. Environmental Biology of Fishes 2(1): 25-33

An investigation of the effect of parentage and temperature on the expression of selected meristic characters of rainbow trout, S. gairdneri, reveals statistical differences in the number of vertebrae, dorsal fin rays and anal fin rays among test batches of progeny of different parentage. Batches of fertilized ova of the same stock or parentage, when incubated at 9.5.degree. C and 14.8.degree. C, produced lower mean dorsal and anal fin ray counts and a higher mean pectoral fin ray count at the higher temperature. Incubation temperature had no significant effect on the number of vertebrae. Significant statistical differences occurring in various characters among groups of rainbow trout of different parental origin provide convincing evidence of genetic inputs into meristic expression. However, the existence of both environmental and genetic inputs into meristic expression in rainbow trout necessitates further investigation before the meaning of observed meristic plasticity in rainbow trout can be resolved.


Accession: 005411427

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Related references

Macgregor, R.B.; Maccrimmon, H.R., 1977: Meristic variation among world hatchery stocks of rainbow trout salmo gairdneri. Sixteen meristic characters were examined among 10 stocks of rainbow trout to establish their inter- and intrastock variability and relative discriminating power. The number of vertebrae, dorsal fin rays, scales above and below and lateral line, o...

Leary R.F.; Allendorf F.W.; Knudsen K.L., 1985: Variation among families of rainbow trout salmo gairdneri for canalization of meristic characters. Genetics 110(3 PART 2): S95

Leary R.F.; Allendorf F.W.; Knudsen K.L., 1985: Inheritance of meristic variation and the evolution of developmental stability in rainbow trout salmo gairdneri. Relatively high heritabilities in the narrow sense for 7 of 8 meristic characters were found in a population of rainbow trout using regression of mean progeny values on mid-parent values. There is no statistically significant additive genetic vari...

Aulstad, D.; Gjedrem, T.; Skjervold, H., 1972: Genetic and environmental sources of variation in length and weight of rainbow trout (Salmo gairdneri). Journal Fish Res Bd Canada, 293: 237-241

Refstie, T., 1980: Genetic and environmental sources of variation in body weight and length of rainbow trout fingerlings salmo gairdneri. Environmental and genetic factors influencing the growth rate of rainbow trout were studied. Body weight and length at a standard age were significantly affected by 1st-feeding data and number of fish held in a tank. The estimates of heritabilitie...

Kwain, Wen-hwa, 1975: Embryonic development early growth and meristic variation in rainbow trout salmo gairdneri exposed to combinations of light intensity and temperature. Journal of the Fisheries Research Board of Canada 32(3): 397-402

Dodge D.P.; Maccrimmon H.R., 1971: Environmental influences on extended spawning of rainbow trout salmo gairdneri. Transactions of the American Fisheries Society 100(2): 312-318

Chevassus, B.; Blanc, J.M.; Bergot, P., 1979: Genetic analysis of the number of pyloric ceca in brown trout salmo trutta and the rainbow trout salmo gairdneri 2. effect of the genotype rearing environment and feeding on expression of the characteristic in the rainbow trout. Four factors liable to affect the within and between-population variability of the number of pyloric ceca in rainbow trout (S. gairdneri) were studied. After 6 mo., no variation due to age was observed even after transferring the fish from 1 fish...

Chevassus, B.; Blanc, J.M.; Bergot, P., 1979: Genetic control of the number of pyloric caeca in the brown trout (Salmo trutta L.) and rainbow trout (Salmo gairdneri Richardson). 2. Effect of genotype, rearing environment and nutrition on the expression of the trait in the rainbow trout. The parent-progeny correlation for number of caeca was 0.92, and the pooled estimate of h2 of the trait from 2 experiments was 0.53 plus or minus 0.07. [For Pt. 1 see Annales d'Hydrobiologie 7, 105-114].

Gjerde B., 1982: Genetic variation in production traits of atlantic salmon salmo salar and rainbow trout salmo gairdneri. Annales de Genetique et de Selection Animale 14(1): 113