For smooth separated families with enough nice base schemes, we describe the derived category of the generic fiber as a Verdier quotient. When the family is a proper effectivization of a formal deformation, the Verdier quotient is equivalent to the categorical general fiber introduced by Huybrechts-Macrì-Stellari. Our description allows us to induce Fourier-Mukai transforms to generic and geometric generic fibers from derived-equivalent smooth proper families. As an application, we provide new examples of nonbirational Calabi-Yau threefolds that are derived-equivalent. They consist of geometric generic fibers of smooth projective versal deformations of the Gross-Popescu pair, the Pfaffian-Grassmannian pair, and Reye congruence and double quintic symmetroid Calabi-Yau threefolds. D b (X) D b (X) SISSA,