Field estimates of food consumtion of the searobin Prionotus Punctatus (Bloch, 1797) on the continental shelf off Ubatuba, southeastern Brazil - Soares, Lucy Satiko Hashimoto; Jarre-Teichmann, A; Rossi-Wongtschowski, Carmen Lúcia del Bianco (Revista Brasileira de Oceanografia - Brasilian Journal of Oceanography, 1998)