WEEK-2-Phenotypic Variation and Environmental Effects
Components of the Phenotype: P = G + E + GE (where P is the performance or phenotype (appearance or characteristics) of an individual, G is the genotype or genetic make up of an individual, E is the environment of the individual and GE is the interaction between the genotype and the environment)
Phenotypic variation=VP = VG + VE + VGE
(where VG is genetic variation, VE is environmental variation and VGE is variation from genotype–environment interactions)
There are numerous environmental effects and variations that can affect the phenotype and need to be controlled or corrected. These include age, mortality, stocking density, temperature, water quality, maternal effects, compensatory gain, competition, magnification effects, skewness, size effects and procedures such as communal stocking.
