It s easy to be caught while spawning from april to july . the texture of the meat is firm and very delious . it s very important to keep it fresh especially in summer 主要有海洋岛连青石大沙及沙外等渔场，渔期一般春汛为47月份秋讯为912月份。
2.
The summer flood reason is the key period for reservoir controlling flood and achieving benefit because this stage is longer and the volume of flood is larger 对水库春汛的防洪风险进行了定性分析。水库夏汛时间长,洪量大,是水库确保防洪安全和实现兴利效益的关键时期。
3.
Sailling against the current is the very important period of spawning and feeded in the whole life time . the best fishing season is from december to the next febuary and april to june 分布于北太平洋西部近海我国的黄海和渤海产量多，东海较少渔期分春秋两季， 4 - 5月份为春汛。
4.
From april to june , but because of the special habit of sail against the current to the south in the autumn , the catch after september is depanded on the warm weather 分布于北太平洋西部我国产于东海黄海和渤海。主要渔场有舟山连云港外海及山东南部沿海每年的46月份为春汛， 710月份为秋汛， 56月份为旺季。
5.
The summer flood season was subdivided into main flood season and post - freshet season by many methods such as the mathematical statistics method and fuzzy analysis method . the flood control risk in spring was analyzed by the qualitative analysis 本文根据洪水出现时间,将水库的汛期分为春汛和夏汛,并采用成因分析、数理统计、模糊分析等方法又夏汛细分为主汛期和后汛期。
