太湖乔氏短吻银鱼的生物学

太湖产乔氏短吻银鱼于3月中旬至5月末产卵。卵具粘性。集中在有沉水植物着生的湖湾内产卵。生殖周期短,一年可达性成熟。繁殖力强。在水温14.5—25.0℃时,仔鱼在受精后118小时23分孵出。终生以浮游动物为食。生长较缓慢,接近一年才达上市规格。其寿命只一年,产卵后不久死亡。保护其产卵基质——沉水植物,以及适当地扩大银鱼网的网目,是关键的增殖措施。  

ON THE BIOLOGY OF SALANGICHTHYS (NEOSALANX) JORDANI IN LAKE TAIHU

Salangichthys (Neosalanx) jordani is a commercial fish in lake Taihu. Investigation on the biology of this fish, including spawning, feeding habit, migration, growth and life-span, was made during the year 1981—1982.Individuals of one year old attain sexual maturity. Spawning season commences from the middle part of March to end of May. Spawning is in the lake bay, and the adhesive eggs are attached to a submerged vegetation or to other substance. Fertilized eggs hatch in about 118 hours 23 minutes at a temperature range of 14.5—25.0℃.Salangichthys (Neosalanx) jordani is a kind of zooplankton feeder mainly feeding on Cladocera and Copepoda.The fries grow slow; they reach fishing size (40 mm and above) at the subsequent spawning season. The life-span is only one year and parent fish die soon after breeding.