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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39643

Title: The time-course change of nitrogenous excretion in the Kuruma shrimp Penaeus japonicus following nitrite exposure
Authors: Sha-Yen Cheng;Jiann-Chu Chen
Contributors: 國立臺灣海洋大學:環境生物與漁業科學學系
Keywords: Penaeus japonicus;Nitrite;Ammonia-N excretion;Urea-N excretion;Organic-N excretion;Hemolymph ammonia;Hemolymph urea
Date: 2001-02
Issue Date: 2016-12-26T06:30:16Z
Publisher: Aquatic Toxicology
Abstract: Abstract:Penaeus japonicus (12.83±1.24 g) which were exposed individually to 0.002 (control), 0.076, 0.362, 0.719 and 1.433 mM nitrite at 30 ppt of salinity were examined for hemolymph ammonia, urea and nitrite, and nitrogenous excretion after 3, 6, 12, 24 and 48 h, respectively. Hemolymph nitrite and hemolymph urea increased directly with ambient nitrite and exposure time, whereas hemolymph ammonia was inversely related to ambient nitrite and exposure time. Specific excretions of total-N (total nitrogen), ammonia-N, urea-N and organic-N (organic nitrogen) increased directly with ambient nitrite and exposure time. The contribution of ammonia-N excretion and urea-N excretion in the total-N excreted by the control shrimp was 41.7–90.8 and 2.8–10.5%, respectively. The contribution of ammonia-N in the total-N excreted by P. japonicus decreased to 10.0 and 3.8%, when they were exposed for 24 h to 0.076 and 1.433 mM nitrite, respectively. The contribution of urea-N excretion increased to 58.7 and 21.4%, and the organic-N excretion increased to 31.3 and 74.8% in the total-N excreted by the shrimp following 24 h exposure to 0.076 and 1.433 mM nitrite, respectively. It was concluded that P. japonicus following 24 h exposure to nitrite as low as 0.076 mM increased its ammonia-N excretion by a factor of 1.9, its urea-N excretion by 200, and its organic-N excretion by 37, as compared to those in the control solution.
Relation: 51(4), pp.443-454
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39643
Appears in Collections:[環境生物與漁業科學學系] 期刊論文

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