In-Situ Observations of the Deep-sea Goosefish Sladenia shaefersi Caruso and Bullis (Lophiiformes: Lophiidae), with Evidence of Extreme Sexual Dimorphism

The deep-sea goosefish Sladenia shaefersi Caruso and Bullis, now known from only six specimens in collections around the world, appears to be more common than once thought, as indicated by recent in-situ observations off the southeastern United States and in the northern Gulf of Mexico. These sightings have provided new information on geographic distribution, behavior, and habitat, plus evidence for an extreme size difference between putative males and females.