Comparison of Zinc Absorption between Common Carp and Other Fresh Water Fishes

鯉魚與其他淡水魚對鋅吸收率之比較

鄭森雄(Sen-Shyong Jeng) ； 連壯林(Juanq-Lin Lian)

《Zoological Studies》 33卷1期 (1994/01) Pp. 78-85

摘要

為知鯉魚與其他淡水魚類對鋅之吸收如何不同，乃添加65Zn至飼料或水中，測定各種魚類對鋅之吸收率。實驗結果發現鯉魚、由飼料吸收評之比率，為吳郭魚之3倍，草魚、之3.4倍，鰱魚之6.8倍。但由水中，鯉魚對鋅之吸收率與其他魚類相差不大。由此可知，鯉魚比其他魚類含有較高濃度鋅之理由，為其能自飼料中吸收較多之鋅所致。在現行實驗條件下，鯉魚之鋅有95%來自飼料；吳郭魚、草魚及鰱魚則分別有85%、78%及78%之鋅來自飼料。飼料係此等魚類鋅之主要來源。鯉魚自水中吸收鋅之途徑經研究後，發現主要係經鰓而進入魚體。

關鍵字

鋅 ； 鯉魚 ； 鋅之吸收

並列摘要

In order to survey absorption rate differences between common carp and other fresh water fishes, 65Zn was added to diet or water and zinc absorption studied. Results indicate that common carp absorb 3 times more zinc from their diet than tilapia, 3.4 times more than grass carp, and 6.8 times more than silver carp. The relative absorption rates of 65Zn from water among common carp and other fishes were found to be insignificant. Obviously the reason why common carp have a higher zinc concentration in its tissue than other fishes is due to that it has several times higher absorption rate of zinc from diet than other fishes. Under experimental conditions, common carp absorbed 95% of its zinc from diet; whereas, tilapia, grass carp and silver carp absorbed 85%, 78%, and 78% of their zinc from diet, respectively. Diet was the predominate source for zinc absorption in all fishes studied. The absorption channel of zinc from water in common carp was investigated. It was found that gill was the major channel.

並列關鍵字

Zinc ； Carp ； Zinc absorption