南极半岛周边海域南极大磷虾生物学特性的初步研究

Biological characteristic of Antarctic krill(Euphausia superba) around the Antarctic Peninsula

根据2010年1月24日～2月11日在南极半岛周边CCAMLR辖区48.1区和48.2区的拖网磷虾渔获数据,对南极大磷虾的生物学特性进行了初步分析。结果表明:两区南极大磷虾的体长范围为33.65～65.80 mm,优势体长为50.00～58.00 mm,占60.66%;平均体长48.1区略大于48.2区,雌性大于雄性,生长指数为2.75。雌雄性比48.1区和48.2区分别约为1∶0.5和1∶1.5。样本中多为成体(II),而幼体(I)和抱卵雌体(III)较少。平均摄食等级48.2区高于48.1区。体长分布显示48.1区为3+～5+龄虾,48.2区为2+～5+龄虾。

The biological characteristics of Antarctic krill（Euphausia superba） caught by trawler in subarea 48.1 and 48.2 of CCAMLR＇s Convention Area around the Antarctic Peninsula from January 24th to February 11th,2010 were studied.Results showed that body lengths were from 33.65 to 65.80 mm,with the dominant length from 50.00 to 58.00mm,accounting for 60.66% of the total.Mean length in subarea 48.1was bigger than that in subarea 48.2,and average length of females was bigger than of males.Growth parameter was 2.75.The ratio of female to male was about 1 ： 0.5 in subarea 48.1 and about 1 ： 1.5 in subarea 48.2.For the maturity stage,almost all samples were adults（II）,juveniles（I） and gravid female（III） were few.Mean feeding stage in subarea 48.1 was bigger than that in subarea 48.2.Length distribution showed that the population was composed of age group 3＋-5＋ in subarea 48.1 and 2＋-5＋ in subarea 48.2.