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大银鱼冬季产卵,12月中旬左右当水温降至2～6℃时是人工繁殖的最佳时间。山东省诸城市1995年抓住时机人工采卵7000多万粒,受精率达到85％,被定为山东省大银鱼供卵基地。现将技术要点简述如下: 一、亲体采捕 1.捕捞地点:大银鱼产卵场,即底质为硬泥或泥沙的水域。 2.捕捞工具:拖网或小刺网。小刺网要求网目1.5～2.4cm、网高1m左右。 作业时间不宜过长,一般1小时左右取鱼一次,取鱼动作要快速、轻微,注意保护卵巢与精巢的完
Silverfish lay eggs in winter, about mid-December when the water temperature dropped to 2 ~ 6 ℃ is the best time for artificial reproduction. In 1995, Zhucheng City, Shandong Province seized the opportunity to artificial eggs more than 7,000 million artificial insemination, fertilization rate reached 85%, was designated as the base of Shandong Province for the large silverfish eggs. The technical points are summarized as follows: First, the parental capture 1 fishing locations: spiny silver spawning grounds, that is, the sediment bottom of hard mud or sediment waters. 2. Fishing tools: trawls or splinters. Small Gill nets required mesh 1.5 ~ 2.4cm, about 1m high. Working time should not be too long, generally about 1 hour to take fish once, take fish movements to be fast, slight, pay attention to protect the ovaries and the end of the testis