The effects of increasing soya bean lecithin (SL) levels (0%, 2% and 4% of diet dry matter, DM) at two fish oil (FO) levels (0% and 3% DM) on gonad index, colour and biochemical composition of Strongylocentrotus purpuratus were evaluated using a 3 × 2 factorial design with six iso‐nitrogenous formulated diets. All diets generated an increase in gonad index of more than 9%. Dietary FO had a positive effect on diet digestibility and accumulation of proteins in the gonad. Soy lecithin did not affect gonad composition, but improved its coloration, decreased gonad feed conversion ratio and increased gonad protein efficiency. There was a clear effect of diets on sea urchins gonad protein, ash and fatty acid content, in particular, decreasing the n‐3/n‐6 ratio associated with a decrease in 20:5n‐3 when SL levels increased. Nevertheless, 22:6n‐3 levels increased by week 12 in all treatments, and diets with SL increased the content of 20:4n‐6 in gonads. A decrease in bitter‐tasting amino acids such as histidine, cysteine, valine and methionine was observed in all treatments with a concomitant increase in isoleucine levels. We recommend using a diet containing 3% of FO and 2% of SL to increase food consumption, diet digestibility, improving marketable gonad colour and an increasing gonad n‐6 fatty acids and C22:6n‐3. In addition, the present study paves the way for future research in the use of FO and SL as an additive in diets for S. purpuratus towards the goal of increasing gonad size and nutritional quality.

中文翻译：

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日粮鱼油和大豆卵磷脂对紫色海胆性紫癜（Strongylocentrotus purpuratus）性腺指数，颜色和生化组成的影响（Stimpson 1857）

在两种鱼油（FO）水平（0％和3％DM）下，大豆卵磷脂（SL）水平（日粮干物质的0％，2％和4％）的增加对性腺指数，色泽和生化的影响采用3×2因子设计和六种等氮配方饮食评估紫圆叶猪笼草的组成。所有饮食都使性腺指数增加了9％以上。饮食中的FO对性腺中的饮食消化率和蛋白质积累具有积极作用。大豆卵磷脂不影响性腺的组成，但改善了其色泽，降低了性腺的饲料转化率并提高了性腺蛋白的效率。饮食对海胆中性腺蛋白，灰分和脂肪酸含量有明显的影响，特别是降低n-3 / n-6比例并降低20：5 n‐3 SL水平增加时。尽管如此，所有治疗在第12周时22：6 n-3的水平都增加了，而SL饮食增加了性腺中20：4 n -6的含量。在所有治疗中均观察到苦味氨基酸（例如组氨酸，半胱氨酸，缬氨酸和蛋氨酸）的减少，同时异亮氨酸水平随之增加。我们建议使用含有3％的FO和2％的SL的饮食来增加食物消耗，饮食消化率，改善可销售的性腺颜色以及增加性腺n-6脂肪酸和C22：6 n -3 。另外，本研究为将来使用FO和SL作为紫癜链球菌饮食中的添加剂铺平了道路，以实现增加性腺大小和营养质量的目标。