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标题：Water quality tolerance and gill morphohistology of pure and reciprocal crosses of Pangasianodon hypophthalmus and Clarias gariepinus
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作者：V.T. Okomoda ; I.C.C. Koh ; A. Hassan 等
期刊名称：Journal of King Saud University - Science
印刷版ISSN：1018-3647
出版年度：2019
卷号：31
期号：4
页码：713-723
DOI：10.1016/j.jksus.2018.01.003
语种：English
出版社：Elsevier
摘要：AbstractTolerance to degrading water qualities in relation to the gill morphohistology was investigated in pure and reciprocal crosses of two important catfishes. Progenies ofClarias gariepinus(CG),Pangasianodon hypophthalmus(PH),Pangapinus (♀PH×♂CG) and the two observed morphotypes (Clarias-like and Panga-like) of Clariothalmus (♀CG×♂PH) were obtained from the same breeding history. These fishes were cultured in a static system without aeration and at high stocking density for a maximum period of two weeks. Mortality and water quality were monitored daily. Total mortality was observed 24 h post exposure (1DPE) in the Panga-like Clariothalmus, while the Pangapinus and pureP. hypophthalmusdid not survive beyond the third day (3DPE). However, total mortality was not recorded in the PureC. gariepinusand Clarias-like Clariothalmus even after 14DPE. Morphohistology of the gills of the latter fishes showed the presence of an accessory breeding organ in the form of branched bulbous dendritic-like structures and less occurrence/severity of many histopathological conditions observed during the challenge experiment. However, this was not the case with the other fish groups. It was concluded that the architecture and the level of susceptibility of the gill influenced the tolerance ability of the different fishes to poor water quality.
关键词：Gill lamellar;African catfish;Asian catfish;Morphotype;Anoxia