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Distribution, abundance and growth of early stages of the glass squid Galiteuthis glacialis (Cephalopoda: Cranchiidae) captured in Prydz Bay, Antarctica during austral summer
Deep Sea Research Part II: Topical Studies in Oceanography ( IF 3 ) Pub Date : 2020-04-25 , DOI: 10.1016/j.dsr2.2020.104783
Kurichithara K. Sajikumar , N. Ragesh , P. Sabu , Geetha Sasikumar , Kolliyil S. Mohamed

We describe the distribution, abundance and growth of the paralarvae and juveniles of the glass squid Galiteuthis glacialis which were collected from tows conducted at 500 m depth in Prydz Bay, Antarctica by using an Isaacs Kidd Midwater Trawl (IKMT). Paralarvae occurred in an area from 57° S to 65°30ʹ S and 57°–66° E. Early juveniles co-occurred with paralarvae at 57°–65°30′ S and 57°37′ E to 64°56′ E. Age of individuals was estimated based on statolith increment counts and ranged from 47 to 85 days with a daily growth rate ranging from 0.13 to 0.25 mm dorsal mantle length (DML)/day (mean 0.18 mm) for paralarvae. The early juveniles had an age of 85–103 days with a slightly faster growth rate ranging from 0.21 to 0.27 mm DML/day (mean 0.24 mm). The presence of paralarve of G. glacialis at the outer continental shelf edge of Prydz Bay during austral summer indicates a spawning site in this area.



中文翻译:

南方夏季在南极普莱兹湾捕获的玻璃鱿鱼Galiteuthis glacialis(Cephalopoda:Cranchiidae)早期的分布,丰度和生长

我们描述了使用Isaacs Kidd Midwater Trawl(IKMT)从南极普里兹湾以500 m深度进行的拖曳收集的玻璃鱿鱼Galiteuthis glacialis的幼虫和幼虫的分布,丰度和生长。幼虫发生在南纬57°至65°30°S和57°–66°E的区域。幼虫在57°–65°30′S和57°37′E到64°56′E的同时发生。根据石笋的增加数来估计个体的年龄,其年龄为47至85天,而幼虫的日生长速率为背壳膜长度(DML)/天(平均0.18 mm)/天0.13至0.25 mm。早期的少年年龄为85-103天,生长速度稍快,从0.21到0.27毫米DML /天(平均0.24毫米)。G. glacialis的伞形虫的存在 在南方夏季,Prydz湾的外大陆架边缘的该处表明该区域是产卵地。

更新日期:2020-04-25
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