菱塘养鱼技术研究

报导了“菱塘养殖”的某些关键技术。它们包括：（１）通过品种结构调整，解决鱼菱相克的矛盾；（２）通过在菱群落“开天窗”，避免鱼窒息致死；（３）实行混合养殖，拓宽生态位；（４）通过鱼种投放量与鱼产量关系的研究，为鱼种合理搭配提供了科学依据。由于上述问题的解决，这种农业模式发挥了明显的经济效益。

STUDY ON TECHNIQUES OF FISH CULTURE IN WATER CALTROP POND

In this paper, the key techniques of fish culture in water caltrop pond are reported. These techniques include:(1)solving the antagonistic contradiction between water caltrop and fishes; (2)avoiding the suffocation of fish by leaving a blank in water caltrop community; (3) mixed culture of several kinds of fish in a single pond; (4) the rational stocking donsity of fingerlings in a unit area. Because of these techniques, this agriculture mode has evidently brought economic benefit into being.