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2009/2010和2010/2011两渔季,我国渔轮在南极公约区内、位于CCAMLR48.1亚区邻近南设得兰群岛和48.2亚区邻近南奥克尼群岛的南大西洋水域开展了南极磷虾捕捞作业。根据两渔季采集的捕捞群体中南极大磷虾体长及性比资料,利用体长频数的混合分布法,比较和分析了两渔季我国商业捕捞所获南极大磷虾Euphausia superba Dana的种群年龄结构特点。结果表明,2009/2010和2010/2011渔季夏至秋初(12月～翌年4月),近南极半岛的南设得兰群岛和南奥克尼群岛附近水域,南极大磷虾捕捞群体中至少有5个年龄组,雌雄性比、种群年龄组成存在较为明显的年间和季节、区域差异。48.1亚区近南设得兰群岛水域,2009/2010和2010/2011渔季的1月和12月,南极大磷虾以5+龄虾数量最多,雌性临产个体占相当比例(>40%),雌性临产个体的年龄分布为3+～5+龄,以5+龄为主。而48.2亚区邻南奥克尼群岛的水域,2009/2010渔季的2月,以5+龄虾数量最多,出现一定比例的5+龄雌性临产个体;2010/2011渔季2～4月连续3月,随时间后移,该水域的大磷虾年龄构成由复杂转为单一;以3+龄虾数量最多,雌雄比值增加;雌性临产个体由很少至基本不出现(<1%);各年龄组生长率随月减少,3～4月均为负值。由上述结果推测,2010/2011渔季南极大磷虾产卵高峰期应早于2011年2月,较2009/2010渔季有所提前。
In the two fishing seasons of 2009/2010 and 2010/2011, the fishing vessels of our country were located in the Antarctic Convention Area, in the South Atlantic Sea near CCAMLR 48.1 subregion and South Atlantic Ocean in sub-region 48.2 sub-region of South Asia. Antarctic krill Fishing operations. According to the body length and sex ratio data of the collected Chinese Antarctic krill in two fishing seasons, the population distribution of Euphausia superba Dana in commercial fishing in China was compared and analyzed by using the mixture length distribution method. Age structure characteristics. The results showed that in the summer / autumn / early autumn of the fishing season (December - April next year) in 2009/2010 and 2010/2011, near the South Shetland Islands and South Orkney Islands in the Antarctic Peninsula, at least There are 5 age groups, male and female than the age of the population there are more obvious years and seasons, regional differences. 48.1 In the months of January and December of the 2009/2010 and 2010/2011 fishing seasons, the population of Antarctic krill was the highest in 5+ shrimps and the proportion of female-born individuals accounted for a significant proportion (> 40%), The age distribution of female parturient was 3 + ~ 5 + years old, mainly in 5+ years. 48.2 In the waters near the Oena Orkney Islands in the subregion, the number of 5+-year-old shrimp was the highest in the 2009/10 fishing season in February, with a certain proportion of 5+-year-old female-born individuals; the fishing season of 2010-2014 was from April to April For 3 consecutive months, with the passage of time, the age composition of krill in this area changed from complicated to simple; the number of shrimp reached the highest in 3+ years and the ratio of male and female increased; the number of female littermates rarely increased (<1%), ; The growth rate of all age groups decreased with the month, 3 ~ April are negative. Based on the above results, the peak season of spawning of the Antarctic krill during the fishing season of 2010/2011 is expected to be earlier than that of February 2011, ahead of the fishing season of 2009/2010.