Q: In this task, you are given a paragraph in Chinese, and your task is to construct a question in Chinese from the given passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique, and (iv) the answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses the same words or phrases given in the passage. 
大鳞副泥鳅（学名：）为辐鳍鱼纲鲤形目鳅科的其中一种，俗名大泥鳅、红泥鳅。本鱼分布于中国四川省内见于长江、嘉陵江和岷江水系、浙江省和台湾、辽宁省辽河中下游、黄河、黑龙江等。并引进日本，该物种的模式产地在长江。水深0至10公尺。本鱼体延长呈圆柱状，头小且具5对须。鱼体呈灰褐色，腹部浅黄色，具不规则的黑色细小斑点或线纹，有些地区体色较红。背鳍及尾鳍有暗色小点排列成行，尾鳍圆形，体长可达20公分。本鱼为初级淡水鱼，喜欢在泥底质的水田、水渠、沼泽或河川缓流，对环境的适应力与耐污力颇强，可生活于溶氧不足且水位浅的湿地，并能吞入空气泡进行肠壁呼吸，属杂食性，以水生昆虫、藻类、有机碎屑等为食。为食用鱼，目前已多为人工养殖。
A:
大鳞副泥鳅主要以什么为食物？