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The Journal of the Royal Institute of Thailand Volume II - 2010 Piamsak Menasveta, Somkiat Piyatiratitivorakul 85 to the animal protein diet. The addition of Finnstim in animal protein diet significantly improved the FRC. Nevertheless the level of 0.75% and 1.50% Finnstim did no differ significantly. It should be noted that the FRC in this study was the laboratory FRC or in other words “technical FRC”. Therefore, the values were somewhat higher than those normally reported in large grow-out ponds. As regards survival, Tukey testing revealed that animal protein diets gave a better survival rate than the plant protein diets. The addition of Finnstim in both basal diets significantly improved survival. According to the above results, it could be concluded that the addition of 1.5% Finnstim in plant protein diet resulted in 8.9% better growth and 11.8% better food conversion compared to the control. This diet was also compatible to the generalized Thai shrimp feed (animal protein diet). The addition of 1.5% Finnstim in the animal protein diet resulted in 17.5% better growth than the 0.75% Finnstim addition and 35.8% better growth than the control. The addition of Finnstim resulted in an approximately 5% improvement in survival. Table 5. Effects of Finnstim on growth slopes, technical food conversion ratio (FCR), and survival of shrimps in expressed as a percentage. Growth Slopes FCR Survival (%) Plant Protein Control (PPC) 0.145 a 2.92 a 77.5 a PPC + 0.75% Finn 0.153 ab 2.80 ab 78.3 a PPC + 1.50% Finn 0.171 bc 2.61 b 84.2 ab Animal Protein Control (APC) 0.208 c 2.38 c 85.0 ba APC + 0.75% Finn 0.215 d 2.12 d 90.8 b APC + 1.50% Finn 0.210 e 2.00 d 90.0 b Within a column, values with different superscripts are significantly different (P < 0.05). The study results presented are comparable with the feeding trial reported by Ung and Junilla (1989). However, their study did not use a high plant protein basal diet. Smith et. al. (2005) studied the effectiveness of different attractants including Finnstim. They found no significant difference in the amount the shrimp consumed of any of the feeds, but the growth rate was faster on the feeds containing crustacean meal or krill meal.