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Eco-physiological studies on Chinese integrated fish culture

中国综合鱼类养殖的生态生理研究

基本信息

批准号：
03044075
负责人：
MAEDA Hiroto
金额：
$ 5.44万
依托单位：
Lake Biwa Research Institute (1992)Wakayama University (1991)
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03044075/
关键词：
Chinese integrated fish culture Decomposition of grass carp faces Intestinal decomposition in grass carp delta^<15>N Picoplankton Bacterial flora Detritus Attached bacteria バクテリヤフロ-ラ

项目摘要

In a Chinese integrated fish culture conducting around Dianshan Lake in Shanghai, Grass carp (Ctenopharyngon idella) and some other cyprinid fishes with different food habits are coreared with water plants to give extremely high fish yields. In this system, a large amounts of grass carp excreta suspended in the culture pond seem to play an important role in providing food material directly or indirectly to other fishes. In fact, considerable quantities of decomposing grass carp faces were found in the intestinal contents of Carassius auratus and Aristichthys nobilis.In the present study, grass carp face (fragments of Vallisneria spiralis) collected from the pond were decomposed under aerobic laboratory condition, in order to discover the role of grass carp faces in the food-webs of this pond ecosystem. During 16 days of decomposition, carbon contents in the faces decreased at a constant rate to 50% of original contents, while nitrogen contents hardly decreased for the first 8 day periods of the experiment. The nitrogen as well as amino acid contents per unit of dry weight of faces increased up to the maximum level on the 8th day of the experiment, but changed little during further decomposition. ^<15>NH_4^+ and ^3H-thymidine added the incubation medium were actively incorporated into various sized fecal fragments. It is suggested that decomposing grass carp faces (including resultant bacteria and their metabolic products) make a new food resource available to invertebrates as well as to the plankton and benthos cyprinid feeders in this pond ecosystem.

在上海淀山湖周边进行的中国综合养鱼中，草鱼（Ctenopharyngon idella）和其他一些食性不同的鲤科鱼类与水生植物共养，以获得极高的鱼类产量。在这个系统中，养殖池中悬浮的大量草鱼排泄物似乎在直接或间接为其他鱼类提供食物原料方面发挥着重要作用。事实上，在鲫鱼和鲫鱼的肠道内容物中发现了大量腐烂的草鱼面。本研究将从池塘收集的草鱼面（苦草碎片）在实验室有氧条件下分解，以揭示草鱼面在该池塘生态系统食物网中的作用。在 16 天的分解过程中，表面的碳含量以恒定的速度下降到原始含量的 50%，而氮含量在实验的前 8 天几乎没有下降。单位干重的氮和氨基酸含量在实验第8天增加到最高水平，但在进一步分解过程中变化不大。添加到培养介质中的 15 NH_4+ 和 3 H-胸苷被主动掺入到各种大小的粪便碎片中。有人认为，分解的草鱼面部（包括产生的细菌及其代谢产物）为该池塘生态系统中的无脊椎动物以及浮游生物和底栖鲤科鱼类提供了新的食物资源。