Attributes / relations provided by
♦ ¹Carpentieri, P., Colloca, F. and Ardizzone, G. (2007), Rhythms of feeding activity and food consumption of two Mediterranean burrowing fishes: Gnathophis mystax (Delaroche) and Chlopsis bicolor Rafinesque. Marine Ecology, 28: 487–495
♦ ²Diet comparison of four ray species (Raja clavata, Raja brachyura, Raja montagui and Leucoraja naevus) caught along the Portuguese continental shelf, Inês Farias, Ivone Figueiredo, Teresa Moura, Leonel Serrano Gordo, Ana Neves and Bárbara Serra-Pereira, Aquat. Living Resour. 19, 105–114 (2006)
♦ ³Feeding habits and trophic levels of Mediterranean fish, Konstantinos I. Stergiou & Vasiliki S. Karpouzi, Reviews in Fish Biology and Fisheries 11: 217–254, 2002