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頁籤選單縮合
題 名 | The Role of Neutral Lipid on Cold Acclimation of Juvenile Channel Catfish (Ictalurus punctatus)=中性脂質對美洲河鯰低溫適應之重要性 |
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作 者 | 黃沂訓; | 書刊名 | 臺灣水產學會刊 |
卷 期 | 21:3 1994.09[民83.09] |
頁 次 | 頁249-262 |
分類號 | 438.661 |
關鍵詞 | 美洲河鯰; 中性脂質; 脂肪酸不飽和度; 低溫適應; 長鏈高度不飽和脂肪酸; Channel catfish; Neutral lipid; Fatty acid unsaturation; Cold acclimation; HUFA; |
語 文 | 英文(English) |
中文摘要 | 美洲河鯰稚魚(5-8克)以4%之三甘油硬脂酸、鯰魚油、鯡魚油以及(1/1, w/w)之鯰魚油及鯡魚油各配成4種育飼料餵飼於26℃。經過8週後,鯰魚之肝臟和鰓之中 性脂質含量未因攝取之飼料脂質來源不同而有顯著差異。水溫會影響鯰魚此二組織中性脂質 之含量;當溫度降至15℃經過2週之飼育,中性脂質在此二種組織中的含量亦未因所攝食之 脂質源不同而有所改變,與26℃比較其含量並無差異。俟水溫降至10℃經過2週之餵飼,其 中性脂質在肝及鰓中之含量皆顯著下降。再經過4℃2週,中性脂質在此二組織之含量皆與 在10℃中之含量無顯著差異。此一趨勢未因飼料中脂肪酸來源不同而有所差異。 在脂肪酸組成方面,無論肝或鰓中其中性脂質皆能反應飼料中脂肪酸之組成;中性脂質 之不飽和度在15℃時比26℃高,但當水溫降至10℃以及4℃其中性脂質不飽和度又再降低而 與在26℃時相同;此由於其中性脂質中高含量的單價n-9族不飽和脂肪酸有調節其不飽和度 的作用。常溫下,飼料中的必需脂肪酸經吸收代謝後轉成極性脂質,大多數以磷脂質狀態出 現,多餘的必需脂肪酸乃儲存於中性脂質中;因此中性脂質在鯰魚體內,除了在低溫下有調 節能量之供需外,尚有提供磷脂質必需脂肪酸的緩衝作用。 |
英文摘要 | Juvenile channel catfish, Ictalurus punctatus, were fed four different diets, with 4% lipid sources, which were tristearin, catfish oil, menhaden oil and a (1/1, w/w) mixture of catfish oil and menhaden oil, at 26℃ for e8 weeks. The contents of neutral lipid in both liver and gill showed no significant differences among the four dietary treatments and remained at the same level after exposure to 15℃f for 2 weeks, decreased after a 2 week exposure to 10℃, and remained at about the same level as at 10℃ after 2 weeks exposure to 4℃. Fatty acid composition of neutral lipid reflected that of the dietary source. Increased levels of fatty acid unsaturation of neutral lipid in both liver and gill tissue occurred at 15℃ for all dietary treatments. However, at 10℃ and 4 ℃, the unsaturation level of fatty acid returned to a level similar to that at 26℃. Monoenes of n-9 fatty acid family played an important role in the regulation of fatty acid unsaturation in the neutral lipid. Neutral lipid is an essential fatty acid pool and energy source functioning as a buffer system in which essential fatty acids can be accumulated at optimum temperatures and withdrawn at sub-optimum low temperatures in the fatty acid metabolism of channel catfish. |
本系統中英文摘要資訊取自各篇刊載內容。