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首页> 外文期刊>African Journal of Food, Agriculture, Nutrition and Development >Preliminary study on the aspects of the biology of snakehead fish parachanna obscura (günther) in a Nigerian wetland
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Preliminary study on the aspects of the biology of snakehead fish parachanna obscura (günther) in a Nigerian wetland

机译：尼日利亚湿地蛇头鱼parachanna obscura（günther）的生物学方面的初步研究

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Between October 2000 and March 2001, a preliminary study on the aspects of the biology of Parachanna obscura, was carried out. Sex ratio revealed female preponderance (÷2 = 4.733, df = 1, P < 0.05). There was no variation in sex ratio during the wet season but there were more females than males in the dry season (÷2=4.735, df = 1, p = <0.05). A curvilinear plot was delineated in the regression of the total length (9.0-18.0 cm TL) and total weight (5.6-40.11g TW), where TW = 0.018621 TL2.697, n = 408, r = 0.869, ([p<0.001). Trophic spectrum of P. obscura size range 9.0-18.0 cm comprises ten food items. The items were re-classified into seven major groups consisting of detritus [coarse and fine detritus], fish [juvenile and remains of fish], insects (un-identified adult and remains of insects, macrophyte materials, mud, nematode, and biogenic sand. Fish, insects and nematodes were eaten as primary food items. There was a complete ingestion of the array of the dietaries by both sexes of Parachanna obscura. Exception of one item (coarse detritus), during the wet season, Parachanna obscura consumed all the dietaries during the seasons. Nevertheless, the later season increased in the ingestion of nine out of 10 items in conformity with optimal foraging theory. Parachanna obscura is considered a piscivore-insectivore-invertivore in feeding habits. In the wake of doubt about the viability and prospects of aquaculture, farming of P. obscura could be desirable. This species possesses a number of positive attributes when it comes to aquaculture. It is likely that efforts to culture this hardy carnivorous and fast-growing fish will spread in the coming years in Nigeria, if breeders and fish farmers will give it a chance. Further studies are, however, required to delineate the full biology of P. obscura in order to highlight its viability for domestication and cultivability. P. obscura is widely enjoyed by natives of its natural habitats all over the world as a source of protein.
机译：在2000年10月至2001年3月之间，进行了对Parachanna obscura生物学的初步研究。性别比显示出女性优势（÷2 = 4.733，df = 1，P <0.05）。雨季男女比例没有变化，但旱季女性多于男性（÷2 = 4.735，df = 1，p = <0.05）。在总长度（9.0-18.0 cm TL）和总重量（5.6-40.11g TW）的回归图中绘制了曲线图，其中TW = 0.018621 TL2.697，n = 408，r = 0.869，（[p < 0.001）。隐孢子虫的营养谱范围为9.0-18.0 cm，包括十种食物。这些项目被重新分类为七个主要类别，包括碎屑（粗碎屑和细碎屑），鱼（鱼的幼体和残留物），昆虫（未鉴定的成年和残留的昆虫，大型植物材料，泥，线虫和生物砂）鱼类，昆虫和线虫被作为主要食品食用，Parachanna obscura的两性都完全摄入了一系列的饮食。然而，根据最佳觅食理论，后期进食增加了十分之九的食物摄入量。Parachanna obscura被认为是食肉动物食虫-食虫动物-食欲动物。在水产养殖的前景方面，暗黑对虾的养殖可能是可取的，该物种在水产养殖方面具有许多积极的特性。如果养殖者和养鱼者有机会，食肉性和速生鱼将在未来几年在尼日利亚传播。然而，需要进一步的研究来描述隐孢假单胞菌的完整生物学，以突出其在驯化和可培养性方面的可行性。 P. obscura被全世界自然栖息地的人们广泛地认为是蛋白质的来源。

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