多鳞四须鲃耗氧率、排氨率和窒息点的初步研究

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Abstract

In the condition of a determined water temperature(20±0.5)℃,the oxygen consumption rate and asphyxiation point of Barbodes schwanenfeldi were determined through the measurement of dissolved oxygen in control and experimental respiration chambers by Winkler's method.Meanwhile,ammonia excretion rate was also determined by Nessler's reagent method.The results indicated that the oxygen consumption rate decreased gradually with increase of body weight and was shown by Y=0.24X^-0.09 (R²=0.9028);it also decreased gradually with increase of cultivation density and was shown by Y=-0.0296X+0.3301(R²=0.9291).The ammonia excretion rate decreased gradually with increase of body weight and was shown by Y=-0.0008X+0.2433(R²=0.9817);while it increased with increase of cultivation density and was shown by Y=0.0506X+0.4979(R²=0.9889).The oxygen consumption rate of B. schwanenfeldi was obviously higher during the nighttime(18:00-4:00) as compared to the daytime(6:00-16:00),which showed that B. schwanedfeldi hid in daytime and came out at night.Conversely,the ammonia excretion rate was relatively higher during the daytime. The asphyxiation point of B.schwanenfeldi was 1.2572 mg·L^-1,suggesting it had poor tolerance to low dissolve oxygen.

Key words： Barbodes schwanenfeldi oxygen consumption rate ammonia excretion rate asphyxiation point

Received: 25 April 2011

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	HUANG Xiao
	SONG Shuijun

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HUANG Xiao,SONG Shuijun. A preliminary study on oxygen consumption rate, ammonia excretion rate and asphyxiation point of Barbodes schwanenfeldi[J]. , 2011, 30(2): 111-116.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2011/V30/I2/111

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