  The aim of this paper is to classify mildly singular Calabi-Yau threefolds
fibred in low-degree weighted K3 surfaces and embedded as anticanonical
hypersurfaces in weighted scrolls, extending results of Mullet. We also study
projective degenerations, revisiting an example due to Gross and Ruan. Finally
we briefly discuss the general question of embedding a projective fibration
into a weighted scroll.
