In a group of Channel catfish, some individuals have a brown body and others have a white body. In this group, the gene for the body color trait has two alleles. The allele B is for a brown body, and the allele b is for a white body.

A certain Channel catfish is from this group. This Channel catfish's phenotype for the body color trait is a brown body. This catfish's genotype for the body color gene is Bb.
Based on this information, complete the following statement

The Channel catfish's genotype is heterozygous for the body color trait.