  The dependence of correlations of neutron multiplicity {\nu} and gamma-ray
multiplicity Mg in spontaneous fission of 252Cf on fragment mass A* and total
kinetic energy TKE has been investigated employing the ratio of Mg/{\nu} and
the form of Mg({\nu}). We show for the first time that Mg and {\nu} have a
complex correlation for heavy fragment masses, while there is a positive
dependence of Mg({\nu}) for light fragment masses and for near-symmetric mass
splits. The ratio Mg/{\nu} exhibits strong shell effects for the neutron magic
number N = 50 and near the doubly magic number shell closure at Z = 50 and N =
82. The gamma-ray multiplicity Mg has a maximum for TKE = 165-170 MeV. Above
170 MeV Mg(TKE) is approximately linear, while it deviates significantly from a
linear dependence at lower TKE. The correlation between the average neutron and
gamma-ray multiplicities can be partly reproduced by model calculations.
