Four experimental diets were fed to triplicate groups of red drum, rainbow trout, and striped bass, testing the effects of the protein source and the use of an attractant. The diets contained 61% FM or 37% FM and 28% soy protein concentrate (SPC) with or without a coating of squid meal. In the SPC diets, 44% of the nitrogen was supplied from the SPC. There were no significant effects of dietary treatment on specific growth rates and mean body weight, nor were there any effects of protein source on digestibility or protein or energy retention in whole fish (Berge et al. 1999)