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Einar Ringø Sigmund Sperstad Reidar Myklebust Terry M Mayhew Agnar Mjelde Webjørn Melle & Rolf Erik Olsen 《Aquaculture Research》2006,37(16):1644-1653
Atlantic salmon (Salmo salar L.) were fed fishmeal protein for 46 days, and 500 g kg−1 of fishmeal protein substituted with meal from Northern krill (Meganyctiphanes norvegica). No differences were observed in weight gain, length gain, feed conversion or specific growth rate between the groups that could be attributed to dietary manipulation. The adherent microbiota in the hindgut of the two rearing groups were further investigated. By substituting fishmeal with krillmeal, the total viable counts of aerobic and facultative aerobic bacteria colonizing the hindgut of Atlantic salmon increased from 8.5 × 104 to 2.2 × 106. Furthermore, dietary krillmeal affected the adherent hindgut microbiota. The Gram‐positive bacteria Carnobacteria piscicola, Microbacterium oxydans, Microbacterium luteolum and Staphylococcus equorum spp. linens and the Gram‐negatives Psychrobacter spp. and Psychrobacter glacincola were not isolated from hindgut of fish fed the krill diet. On the other hand, Pseudomonas fulgida, Pseudomonas reactans and Stenotrophomonas maltophila were not isolated from the control group fed fishmeal. Acinetobacter lwoffi, which is not normally found in the fish gut, was isolated from both feeding groups. Transmission electron microscopy showed bacteria‐like profiles between the hindgut microvilli in both feeding groups indicating autochthonous microbiota. When fish were fed the krill diet, hindgut enterocytes were replete with numerous irregular vacuoles. These vacuoles were not observed in fish fed the fishmeal protein. 相似文献
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采用秋水仙素溶液整体浸泡，KCl低渗，卡诺固定液固定，空气干燥，Giemsa染色等方法对挪威小毛猛水蚤（Microsetella novegica Boeck)和硬鳞暴猛水蚤（Clytemnestra scutellate Dana)染色体的数目和组进行了初步观察和分析，结果表明，挪威小毛猛水蚤染色体数目为2n=20，全部为中部着丝点染色体，总臂数NF=40，硬鳞暴猛水蚤染色体的数目为2n=20,其中6对为中部着丝点染色体，4对为亚中部着丝点染色体，总臂数NF＝40，本研究旨为解决分类学中的某些疑难问题提供语气，并为饵料生物的引种与驯化提供科学依据。 相似文献
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