Fish Production in China. Fish Fry Producing Areas.

摘要

The major producers of fish fry in China are the Yangtze and Pearl River valleys. Together they account for over 75 percent of the nation's fish crop. The major species of fish caught are grass and common carp, striped and white bighead, black Chinese roach, Cirrhina molitorella, and half a dozen others. The Yangtze watershed produces fry from Hupeh to Kiangsu. Total number of fry taken number into the billions. The Pearl River produces slightly smaller numbers of fry. All collecting of fry in China is done with nets. Careful selection of netting sites is crucial to success. The types of nets used are many and varied. They all have different advantages and disadvantages that suit them to special water types. The collection of the fry occur during the annual fry 'bloom'. This period lasts approximately from mid-April to August. Besides fry, fish eggs are also collected at this time. Places and methods of collecting eggs are well developed and fairly successful. Identification of all species of fish fry is also well developed and accurate. Counting the number of fry gathered raises some problems. The methods most commonly used are estimation, counting by aliquot, volumetric, and partition methods. Of the above methods, only the partition method is accurate. Separation of pest species and desired species of fish can also be a problem. The primary control methods are the sieve method and the squeeze method. Both are fairly effective. (Author)