Insect larvae as feed ingredient selectively increase arachidonic acid content in farmed gilthead sea bream (Sparus aurata L.)

This work is aimed at obtaining farmed fish designed to contain targeted PUFAs. To this end, an experiment was conducted with farmed specimens of gilthead sea bream (Sparus aurata L.), which were fed meal containing different percentages of common green bottle fly (Lucilia sericata Meigen) larvae, cultured on appropriate substrates, and then the fatty acid profiles in fish muscles were determined. Results indicate that arachidonic acid content in fish muscle is significantly increased when replacing different proportions of fishmeal by larvae from L. sericata, which contains arachidonic acid up to 10.6% of total fatty acids. Thus, larvae seem to be a suitable vector for introducing target PUFA in fish muscle and it could also contribute to reduce the use of wild fish stocks for fishmeal production.     

乳化肉桂油优化制备及对咸鲞害虫丝光绿蝇的杀卵作用研究

以内桂油为原料,进行乳化精油配方优化试验,测定不同配方乳化精油对咸鲞害虫丝光绿蝇[Lucilia sericata(Meigen)]的杀卵效果.通过L9(34)四因素三水平正交试验,乳化稳定性考察,确定乳化精油的最优配方为:肉桂油7%(V/V)、辛癸酸甘油酯0.6%(W/V)、蔗糖酯0.4%(W/V)、纯胶9%(W/V).杀卵试验表明,经0.1%肉桂油的最优配方水溶液处理,蝇卵校正未孵化率达到90%以上.经最优配方乳化肉桂油的50～60倍水溶液处理,蝇卵校正未孵化率在95%以上,用该乳液的60～80倍水溶液浸泡接卵鲜成鲞10～20 min,校正未孵化率达到100%,且不影响干成鲞品质.