Abstract
The study aims to determine protein leveland protein energy ratio that producethe best gonad qualityof sea urchin Tripneuestes gratilla. Sea urchin were fed nine test diets with the combination ratio of protein level (%) and protein energy(kcalGE/g) namely; A (22:9), B (22:11), C (22:13), D (27:9), E (27:11), F (27:13), G (32:9), H (32:11), and I (32 : 13). Treatment G produced the best gonad quality with gonad weight, gonad protein and gonad colour of 3.49 g, 64.45 % and pale yellow until orange, respectively. Treatmen G also showed carotenoid total ranged from 15 to 18 ppm and β-carotene ranged from 5 to 6 ppm. Moreover, this treatment exhibited gonad weight and gonad protein resulting in significantly difference(P<0.05) protein level ,protein energy ratio and its interaction. However, carotenoid total and β-carotenedid not exhibit any diffrence (p>0.05).
Highlights
The increasing of gonad price from US $6 to $400 kg-1(Robinson et al 2002; Sphigel et al 2005; Pearce et al 2002),the stable market askingandover fishingin several countries (Hammer et al 2006;Siikavuopio et al 2004, 2006)have supported the development of sea urchin cultivation.The developmentof sea urchin culture has been purposed to increase production and gonad quality
From the treatments of G, H, I with protein level of 32% and C/P ratio of 9,11 and 13 kcal, the highest gonad weight was displayed by the treatment of G (32;9)
At the treatment with the high protein level was neededthe low C/P ratio.In addition, it could be said that in the G treatment, the optimal feed protein was used to increase gonad weight of sea urchin.protein level andinteraction of protein level and protein energyratio gave the significant effect on the increase of sea urchin gonad weight
Summary
The increasing of gonad price from US $6 to $400 kg-1(Robinson et al 2002; Sphigel et al 2005; Pearce et al 2002),the stable market askingandover fishingin several countries (Hammer et al 2006;Siikavuopio et al 2004, 2006)have supported the development of sea urchin cultivation.The developmentof sea urchin culture has been purposed to increase production and gonad quality. Production and gonad quality of sea urchin are influenced by the gonad growth level and nutrition quality. Feed with low energy content will cause sea urchin to use a part of protein as energy source for methabolism. It causes the lack of protein need for gonad development and maturation. The information of feed energy influence protein energy ratio in feed on sea urchin gonad production has still been limited. Since protein has been one richcomponent in feed of sea urchin culture, it is required to determine the optimal protein level need and protein energy ratio for the maximum growth and gonad production in more eficience protein use
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