Distribution of Euphausiid larvae in the Weddell Gyre in September-October 1989

• Main Author: Larisa Menshenina
• Format: Report
• Language: English
• Published: All-Union Research Institute of Marine Fisheries and Oceanography 1992
• Subjects: Maud Rise; Scotia Sea; Weddell; Euphausia superba; Polar Biology; Proceedings of the NIPR Symposium on Polar Biology
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=5152; http://id.nii.ac.jp/1291/00005152/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=5152&item_no=1&attribute_id=18&file_no=1

Distribution of Euphausiid larvae in the Weddell Gyre of late winter was examined. There were only some eggs of Thysanoessa near the ice margin in September, and the eggs and larvae (from nauplius to calyptopis I) were collected under the ice in October. The furcilia VI of Euphausia superba was found under the ice in the north of the eastern part of the Maud Rise region. A single calyptopis I of E. frigida was recorded over the region (in the WWCC waters) and the furcilia of Stylocherion maximum was found in the WWCC waters in the west of the region. The furciliae IV to VI of E. superba, larvae (from metanauplius to furcilia I) of Thysanoessa and larvae (from calyptopis I to furcilia I) of E. frigida were abundant in the ice-free waters of the Scotia Sea in September. The calyptopis I of E. triacantha was found at the northernmost station. Spawning of Thysanoessa in the ice-free waters started in early August, and under the ice it started in late September or in early October. E. frigida initiated the spawning in the ice-free waters in July, while the spawning of E. superba has not begun yet.