普里兹湾及其邻近海域晶磷虾的生态特点研究

198 9/1 990年和 1 990 /1 991年南极夏季在普里兹湾及其邻近海域进行了拖网调查 ,对这一海域晶磷虾 (Euphausia crystallorophias)幼体和成体的数量分布、发育特点、成体的体长 -频数分布以及体长与体重的关系等进行了研究。晶磷虾的近岸性分布特点非常明显 ,幼体和成体均分布在 1 0 0 0米等深线以浅的水域。在陆架区晶磷虾是优势种 ,其幼体和成体的数量远远高于其他种类的磷虾。幼体密度在 70 - 44 3 6 5个 /1 0 0 0米 3之间 ,平均为 942 8个 /1 0 0 0米 3 ;成体及未成体密度在 1 0 - 2 0 3个 /1 0 0 0米 3 之间 ,平均为 5 7个 /1 0 0 0米 3 。1 990年 1月份幼体发育期组成为 N1 - C3 ,其中C1占优势 ,平均发育期指数在 4.1 2 - 5 .0 7之间 ;2 - 3月份发育期组成为 C1 - F3 ,F1 ,F2占优势 ,平均发育期指数在 6 .98- 7.81之间。1 991年 1月份幼体发育期组成为 N1 - C2 ,平均发育期指数为 2 .71 - 3 .6 3 ,MN占优势。未成体体长在 1 7毫米以下。成体体长在 1 7- 3 7毫米之间 ,主要分布在 2 2 - 3 1毫米体长段。大于 2 8- 3 0毫米的体长段里雌性成体的比例大于雄性成体。雌性成体的体重与体长的关系为 :Log W(毫克 ) =3 .0 1 L og L(毫米 ) - 2 .1 4,(n=2 83 ,r=0 .83 ) ;雄性成体的体重与体长的关系为 :L

DISTRIBUTION AND LARVAL DEVELOPMENT OF EUPHAUSIA CRYSTALLOROPHISA IN THE PRYDZ BAY REGION, ANTARCTICA

During the austral summer of 1989/1990 and 1990/1991 net sampling program was carried out in the Prydz Bay region. From these samples, including zooplankton samples by a 80 cm conical net and krill samples by a 6 feet IKMT,the distribution and abundance of larvae and adults of Euphausia crystallorophias studied. Both the larvae and adults of this species occured only in the shelf waters and in the inner margin of slope waters (less than 1000 m in depth ).Larvae density ranged from 70 to 44356 ind./1000m 3,with the highest density being found inside the Prydz Bay. The density of juveniles and adults ranged from 10 to 203 ind./1000m 3,with an average of 57 ind./1000m 3.In 1990,6 larval stages (N1-C3)were found in January,with the MSI (mean stage index) ranged from 4.12 to 5.07. In Feb.-Mar. of the same year they were substituted by C1-F3,with the MSI ranged from 6.98 to 7.81.The larval stage composition indicated that the breeding of this species seemed to start in early November and end in late December.The L/F distribution of juveniles and adults as well as the length-weight relationship were given.