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Date updated: September 2013 Season: all year Socio-economic Importance: Ecological Importance: The Thornback Ray are predominantly feeders of small bottom dwelling crustaceans when juveniles but extend their diet as they grow larger to include larger crustaceans such as swimming crabs, sandeels and small gadoid species. Thornback eggs form an important food source for some fish, while juveniles are preyed upon by larger fish species and adult thornbacks.