Early stages of notothenioid fish from Potter Cove, South Shetland Islands
Early stages of notothenioid fish from Potter Cove, South Shetland Islands
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南设得兰群岛波特湾的早期阶段的诺托尼鱼
作者：
G. L. Piacentino;E. Moreira;E. Barrera
在波特湾，国王乔治岛/岛25德马约，南设得兰群岛，重要的鱼类学研究已进行了在过去的三十年，主要是在底层阶段的一般生态的背thenioid种从年轻的少年到成年人。然而，在海湾的鱼类浮游生物组成的知识，必要的鱼类物种的生命周期的动态的整体理解，仍然是未开发的。在这里，我们报告了2014年夏季和2016年夏季在波特湾6-9米深处收集的南极类动物早期记录，其中总底部深度为30-190米。鱼类浮游生物主要有鱼叉鱼科、南极鱼科和深龙鱼科。它包括（1）37个幼虫阶段（前屈和后屈）的物种Harpagifer anarcticus（最丰富的），Psilodraco breviceps，Lancionotothen squamifrons，Pleuragramma anarcticum和Trematomus scotti，和（2）15个卵的Notothenia coriiceps，其中两个幼虫在水族箱中孵化。部分材料附有照片。小海湾中鱼类早期生命阶段的存在与来自布兰斯菲尔德海峡的主要流入有关，也取决于当地的环境条件（即，水文学、水循环）。南设得兰群岛的近岸海域，如波特湾（Potter Cove），除了是夏氏副深海鱼（Parachaenichthys charcoti）的产卵地外，似乎也是夏氏副深海鱼（N. coriiceps，H. anaiticus和Chaenocephalus aceratus。
At Potter Cove, King George Island/Isla 25 de Mayo, South Shetland Islands, significant ichthyological research has been conducted in the last three decades, mainly on the general ecology of notothenioid species in demersal stages from young juveniles to adults. Nevertheless, the knowledge of the ichthyoplankton composition in the cove, necessary for the overall comprehension of the dynamics of the fish species life-cycles, remained unexplored. Here, we report the first record of the early stages of Antarctic notothenioids collected in pelagic hauls at Potter Cove in summer 2014 and 2016 at depths of 6–9 m where total bottom depth ranged 30–190 m. The ichthyoplankton was represented by members of the families Harpagiferidae, Nototheniidae and Bathydraconidae. It consists of (1) 37 larval stages (preflexion and postflexion) of the species Harpagifer antarcticus (the most abundant), Psilodraco breviceps, Lepidonotothen squamifrons, Pleuragramma antarcticum and Trematomus scotti, and (2) 15 eggs of Notothenia coriiceps, of which two larvae hatched in the aquarium. Part of this material is illustrated by photographs. The presence of early life stages of fish in the cove is linked to the major influx from the Bransfield Strait and also depends on local environmental conditions (i.e., hydrologic, water circulation). In addition to being a spawning site for Parachaenichthys charcoti, already reported in the literature, nearshore localities of the South Shetland Islands such as Potter Cove appear to also be spawning sites for N. coriiceps, H. antarcticus and Chaenocephalus aceratus.