锚头虫属(Lernaea)橈足类,寄生於淡水鱼类。在东南亚一带鱼池中,均寄生於池养鱼之鳃及体旁,形成一种严重的流行病,为害鱼类颇大。我国及日本一带鱼池中亦时有发现。本文乃观察此种锚头虫之生活史及其生活趨向,作为防治之初步研究。作者前在淡水鱼类螃鮍,刺鳅及中华斗鱼体上,发现此属一新种及二新亚种。近在鲩鱼鰓上,又发现此属之另一新种,并在食用池养鱼鲩、鲭、 Lernaea Copepods, parasitic in freshwater fish. Fish ponds in Southeast Asia, are parasitic in the fish pond gill and body, forming a serious epidemic, damage to fish is quite large. In our country and in Japan, fish ponds are also found. This article is to observe the life history of such anchovies and their life trends, as a preliminary study of prevention and treatment. The authors found a new species and two new subspecies in freshwater fish crab, loach and Chinese fighting fish. Nearly in the gill gill, another species of this genus was also found, and in the food ponds fish, mackerel,