Behavioural strategies for feeding of six species of the Antarctic fish family Nototheniidae (Pisces, Notothenioidei) in a tank

• Main Authors: Edith Fanta, Ana Aparecida Meyer
• Format: Report
• Language: English
• Published: Universidade Federal do Parana,Departamento de Biologia Celular.Curitiba,PR, Brazil 1998
• Subjects: 59(26); Admiralty Bay; Antarctic; King George Island; The Antarctic; Antarc*
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=9052; http://id.nii.ac.jp/1291/00009052/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=9052&item_no=1&attribute_id=18&file_no=1

温度, 光条件を制御した水槽を用いて6種のノトセニア科魚類, Notothenia coriiceps, Notothenia neglecta, Trematomus bernacchii, Pagothenia borchgrevinki, Lepidonotothen nudifrons, Pleuragramma antarcticumの摂餌戦略の観察を行った。観察に用いた魚は, 夏季, キングジョージ島, アドミラルティ湾で採取した。P. antarcticumは水中でだけ摂餌したが, 他の5種は水中と底とで餌を摂った。T. bernacchii, L. nudifrons, N. neglecta, P. antarcticumは餌魚に対する攻撃行動を示した。P. antarcticumとN. coriicepsを除き, 一連の摂餌行動は常に, 休止状態から始まった。N. neglecta, T. bernacchii, P. borchgrevinkiの場合, 一度の摂餌行動で一匹の魚を捕食したが, N. coriicepsの場合, 1回の摂餌行動に際して, あちこち泳ぎ廻りながら数匹の魚を食うという動作を示した。総ての魚種がナンキョクオキアミ, 端脚類を摂餌した。T. bernacchiiは魚, 端脚類を一旦口に入れた後, はき出した。水槽中での食物に対する競争は摂餌行動の違いによって緩和されているようである。 The feeding strategies of six Nototheniid fishes, Notothenia coriiceps, Notothenia neglecta, Trematomus bernacchii, Pagothenia borchgrevinki, Lepidonotothen nudifrons and Pleuragramma antarcticum, were studied in tanks, under controlled environmental conditions. These fish were caught in Admiralty Bay, King George Island, during the Antarctic summer. Although P. antarcticum preyed only in the water column, the remaining five species fed not only in the water column but also at the bottom. Persecutions of prey were observed in T. bernacchii, L. nudifrons, N. neglecta and P. antarcticum. The sequence for feeding always started from resting except for P. antarcticum and N. coriiceps. Each feeding sequence lead to the ingestion of one fish each time by N. neglecta, T. bernacchii and P. borchgrevinki, but N. coriiceps was able to catch and ingest several fish during one period of random swimming. Many krill and/or amphipods were usually ingested by all predators during one feeding action, but T. bernacchii also caught them one by one. T. bernacchii, N. coriiceps, N. neglecta and P. antarcticum sometimes rejected fish and/or amphipods after apprehension. The competition for food in the tanks seemed to be minimised by differences in feeding strategies.